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Member postings for Andy Sephton 1

Here is a list of all the postings Andy Sephton 1 has made in our forums. Click on a thread name to jump to the thread.

Thread: RAF's Finest Biplane? Hawker Fury MkI
07/12/2019 07:58:08

For what it's worth, I'll be mounting the tailplane on my model at zero degrees. I don't believe it necessary to mount it at such a negative angle as that shown on the plan. I'll be relying on elevator control to trim the aircraft.

Thread: Lysander for Kit Scale at the 2020 BMFA Scale Indoor RC Nats
31/10/2019 10:27:48

I've been getting on with the model - the latest position is on the Facebook "Scale Indoor R/C - UK" site. SO it's time for a catch-up here.

The first decision I have to make is how to modify the model to fit the R/C gear. The 36" model flew quite nicely as a free flight model, so I'm content that this one will be controllable with rudder/elevator/engine control only. So I started the build with the fuselage and empennage to allow trial fitting of the RC gear. My fuselage technique is to build the two sides on top of each other, using jig pieces from scrap wood that is twice the thickness of the fuselage wood. The sides are then removed from the plan, the edges sanded to match, then they're split, using appropriate caution, with a razor blade. The following pic shows the start of the process:

img_0830.jpeg

While the fuselage sides dried, the empennage was layed down, again using scrap jig pieces to hold the parts in place. The hinge line I'll be using will match the full size aircraft and not the LE as used on the kit model. Accordingly, I'll be adding wood to reinforce the hinge points.

img_0857.jpeg

When the fuselage sides had been split, they were joined using engineers squares to hold them square as the glue dried. The weighted sanding blocks are to hold the lower spacers and fuselage sides onto the plan

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The following two pics show the empennage with new hinge line marked and extra wood added for the hinges and control horns.

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img_0878.jpeg

17/10/2019 17:06:06

The Scale Indoor RC event will be held on Saturday 18th April 2020 at Wolverhampton University Sports Centre, Gorway Rd, Walsall WS1 3BD.

The Scale Indoor FF Nationals will be held at the same venue the following day.

Spectators will be welcome.

17/10/2019 17:00:04

The BMFA Scale Indoor RC nationals have been running now for about 5 years. Next years competition will be over a weekend with the Saturday reserved for the RC flying and Suday for FF. As well as the established Scale and Flying Only competitions, two new competitions have been introduced: an air race and Kit Scale. To support the latter, I've decided to build an Easy Built 48" Lysander and convert it from rubber to electric power.

The Rules have not yet been published, but the general feeling is that they will be a combination of the existing Scale Indoor Kit Scale FF Rules and Scale Indoor RC Flying Rules. So, I'm planning on a maximum model weight of 300gm, a maximum wing loading of 15 gm/sqDM, and a model that will be judged to the kit plan with modifications allowed for the power plant and control system. The flight will require the model to take off, fly a figure of eight, fly a descending circle, fly one other option and carry out a circuit to land.

This model is on the large side, but if I can keep the weight down, I believe I'll get it to fly in the space available ... hopefully!

This is what I found in the box:

img_0811.jpeg

The model appears to be based on the Lysander prototype, so I'll be using that as a basic for the model's finish. Here's a picture of the subject aircraft:

img_0812.jpeg

And here's one I built earlier - the 36" Easy Built Lysander for rubber power:

img_0816.jpeg

Thread: Elan 100 Build
17/10/2019 16:41:41

Thanks for the support Pete.

I believe the answer lies in a new competition such as F3-RES which is flown on the continent. The models of max span 2M must be constructed mainly of wood, carbon is allowed only for LE, spars and rear fuselage boom. Launch is by bungee. The result is a relatively cheap model with a cheap launching system.

To that end I've built an F3-RES model - see the thread on the Slite V2.

Thread: F3-RES
16/06/2019 08:16:12

You're ahead of me on the bungee front, Nigel. I have the parts to make one up but I was waiting to do it on the flying field as I'll need more space than I have in the garden. I also have a Slite ready to test (and an Elan 100 that I'd also like to try on the bungee), but the weather recently has been just awful!

Thread: Slite V2 build thread
09/06/2019 21:25:15

Now for the spoiler. In contrast to the rudder and elevator, this job proved to be remarkably straightforward.

The servo is mounted using servo tape, so the first job was to cut off the servo mounting lugs as they fouled the servo box in the model.

img_0205.jpeg

Next was to bend the actuating arm from 'spare' control rod (I'm not sure where this would come from as most of it was required to join the servos to the empennage!).

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I cut a servo arm to the size shown on the plan, zero'd the servo and fitted the arm in line with the servo axis. Then, using a servo tester, I set the servo to full out spoiler and connected the arm to the spoiler and servo. The servo was then fixed to F4 with servo tape. The spoiler worked fine, but wouldn't close. A quick inspection showed that the servo was sitting proud of the wing. F4 was then removed and the spoiler closed.

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The initial deflection wasn't enough, so I experimented with actuating arm position on the spoiler and servo arm orientation with respect to the servo. In the end, I used the rear hole on the spoiler, a servo arm as per the plan and the servo arm aligned with the axis of the servo when the servo was at neutral. It took about three removals of the servo, but I used the same tape each time. I renewed the tape once I'd got it sorted.

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As you can see from the next photo, the removal of F4 has left only the centre rib of the wing to stick the servo to. It'll do for first test flights, but I'll need to fill in the gaps at the side before I compete with the model.

img_0210.jpeg

So, she's now ready for test, but with poor weather forecast this week, I'm not holding my breath .... so maybe I will go do a bit more to the Fury!

img_0216.jpeg

09/06/2019 21:24:51

Thanks for the kind words Danny - I really must get back on to the Fury build....

I've spent the last two days fitting the radio gear, getting the controls to work and sorting the weight and balance. It's not one of my favourite jobs and on this machine it really lived up to it's name. The fuselage is thin and not very deep., so working in it with my fat fingers was a real challenge.

First off, I procured some of the batteries and servos advertised with the model in the assumption that they would be suitable... the rudder and elevator servos were, but there was no way that the battery was going to fit in the nose and the spoiler servo proved to be too thick - see later for the solution to that one.

The only way I could fit the kit into the model was to put the battery behind the servos and the receiver in front, which is not ideal. The solution would need a lot of wire through the servo bay with little room to stow it. Every change of plan required the servos to be removed, the wire laid down, and the servos replaced. The only solution appeared to be to move the servos back but I was concerned about the damage removing the servo tray would do to the balsa fuselage. In the end, luck won out in that on the fifth removal of the servos, the servo tray broke cleanly out of the model. I could now make a plan. The following shows the intended layout with the design layout above:

img_0202.jpeg

The servo tray needed some slight modification to clear one of the ply uprights and I glued in some 1.5mm balsa sheets (12mm high) to make the job of levelling the tray easier and to give it something to stick to. I made the side plates a little deeper than required to give a bit more clearance for the cables underneath the servos. There would only be one running the full length for the battery, but there was also the two servo leads.

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The result follows:

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While fitting out the model earlier, I noted that the central location of the snake holes in the former at the front of the wing bay lead the snakes to cover the area where I was going to put the receiver and also caused the two control rods to interfere with each other. I drilled out two new holes nearer the side of the fuselage.

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Here's the final layout with the battery in front and the control rods laying nicely at the side of the fuselage.

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A word now on the control rods. I found that they broke easily when bending, in some cases they even broke on the first bend. No problem, I thought, as I have a large stock of 1/32" wire in the workshop. Unfortunately, my stock is UK procured, so it's only 36" long. The model requires 1 metre long control rods so my replacements, as with those supplied with the model after my bending attempts, were too short. Moving the servos back partially solved the problem, but I did have to extend the rudder control slightly by adding a threaded adaptor and quick link.

08/06/2019 12:04:34

That all sounds very positive Nigel, and thanks for the kind words. Lets keep in touch and perhaps meet up for some mutual gliding time.

08/06/2019 11:53:25
Posted by Nigel Dell on 08/06/2019 10:30:11:

Hi Andy, I hope you don’t mind but just a slight (pun intended) correction to the carbon tube sizes.

regards

Nige.

The centre section spar is 12mm od and 11mm id, the LE is 2.5mm and 1.5mm

The mid panel spar is 10mm and 9mm, the LE is 2.5mm and 1.5mm

The outer panel spar is 6mm and 5mm, the LE is 2.0mm

the tailplane spar is 3mm and 2mm

Edited By Andy Sephton 1 on 27/05/2019 19:04:58

Many thanks Nigel. You are, of course, absolutely right. I took the figures from the parts list in the instructions rather than measuring the actual parts. I hope the error has not inconvenienced anyone in any way!

I can also add that the fuselage boom is 11.5/10.9 at the front and 9.0/8.0 at the rear

08/06/2019 11:48:52

Covering:

I've used Oralight covering for the model, translucent on the flying surfaces and solid colour on the fuselage. I have to say that it was easy to use, it produced a good finish and was well worth the expense.

I've picked up two tips recently:

1. Vacuum the model before covering to remove all the dust and stray bits. A see-through reservoir on the hoover is a good idea for this one as is emptying the 'bag' both before and after the exercise!

2. Use two small pieces of masking or similar tape to separate the backing from the film - I've been covering with film for some 40 years now and I so wish that I'd been passed this tip when I first started!

img_0172.jpeg

The covering job progressed pretty quickly, so there's not many pics, I'm afraid.

I covered the centresection in one piece as it had a straight leading edge. The rest of the wing had to be covered both sides separately as both the LE and TE are curved.

The spoiler was hinged with film, as per instructions. The sequence was as follows: fill in the spoiler box with film, cutting a strip abut 6mm proud of the box at the front. Cover the inside of the spoiler. Lay the spoiler on the wing and stick the strip of film to the inside leading edge of the spoiler. fold the spoiler back into the wing, then cover the wing itself. Cut the film on the side and rear edges of the spoiler and a nicely front hinged spoiler results.

Moving on to the empennage, the lower surface of the tailplane and elevator were covered first.

img_0173.jpeg

A strip of film was then ironed onto the edge of the elevator and tailplane as shown - note that the elevator is folded back over the tailplane to do this.

img_0175.jpeg

The tailplane is then turned over and the whole covered in one piece. A top hinged elevator results.

Moving on to the fin, the fin TE and rudder LE were chamfered as shown (the tailplane was chamfered similarly, but no pics, I'm afraid):

img_0176.jpeg

The instructions show the fin and rudder hinged before fitting. Unfortunately this is not possible as the fin slots into the fuselage, so it must be fitted before adding the rudder. The pic shows one side of the fin and rudder covered and a 10mm strip of film fitted to the rudder.

img_0180.jpeg

The rudder was then offered to the fin at about 90 degrees deflection and the strip ironed on to the fin LE. The other side of the fin/rudder was then covered in one piece producing a film hinged unit.

img_0183.jpeg

Another trial assembly gives us a completed model....radio and controls next!

img_0197.jpeg

 

img_0198.jpeg

Edited By Andy Sephton 1 on 08/06/2019 12:08:36

08/06/2019 11:30:47

Tailplane, elevator, fin and rudder:

In general, the laser cutting in the kit was good...but there were three exceptions. We've already seen that some main wing ribs were not fully cut and the ply boxes in the spars were cut too heavily. On the tailplane, several of the ribs were not cut cleanly and required some very careful cutting with a sharp (new blade) modelling knife:

img_0129 2.jpeg

The taiplane was made up in a jig as per the wing. It proved impossible to fit the ribs tnto the jig after fitting them to the spar, so the spar was fitted after putting the ribs in the jig. Apart from the above, there were no issues

img_0132.jpeg

With the tailplane off the jig, the LE was laid down on the board and held with scrap balsa. Note that there is a clear plastic sheet between the board and the LE and one of the TP ribs has broken

img_0133.jpeg

Such is the accuracy of the laser cutting, the fin, rudder and elevators could be laid down on the board without using the plan - except to check positioning of the parts. With all part numbers in view, the parts are correctly orientated.

img_0136.jpeg

with the empennage built, a quick trial fit was too good to miss:

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08/06/2019 11:14:47

The wing tips are permanently joined to the mid-sections. The resulting outboard wing assembly is then joined to the centre-section by steel dowels running into a brass tube inside the hollow spar with a steel pin close to the trailing edge to maintain the incidence. The steel pins and brass tubes are set into boxes made from ply. The gaps are filled with balsa and epoxy and the whole sanded to circular cross section to fit inside the spars. The end plates on the ply boxes set the dihedral angle, but the whole is accurately laid out, so the execution should be simple ....

I had two issues.

The first was that the box end plates were small and complex, but the laser cutting was heavy, so the end plates broke up as I removed them from the carrier sheet:

img_0144.jpeg

Luckily, the bits that were left were enough to set the correct angle on the steel rod, albeit with some of the end plate missing

img_0147.jpeg

 

Here's another view of the first one, including a view of the second with broken bits.

 

img_0148.jpeg

The brass boxes went together a lot easier as they were correspondingly bigger

img_0145.jpeg

And finally, a view of the assembled boxes with balsa and epoxy fill.

img_0161.jpeg

The second issue was getting the 'right' angle for the boxes in the spars. The outboard wing spars are swept back when compared to the centre-section spars. If the boxes are fitted 'square', then there is a gap at the TE

img_0157.jpeg

Therefore, the boxes have to be twisted slightly to get the rod and tube to mate at the right angle for the spar join.

img_0159.jpeg

This will then give a flush joint between the wings.

img_0160.jpeg

The following pic shows an exaggerated twist in the ply box so that you can see what needs to be done. It took a lot of fiddling to get the angle right

img_0164.jpeg

With all that sorted, the boxes were epoxied into the wings and the wings clamped using s suitable spacer (to prevent the wings sticking together!)

img_0168.jpeg

Finally, the outboard sections were removed and the tips glued and clamped using the glass dihedral brace inside the spars.

img_0169.jpeg

...and the TE doublers were fitted to the remainder of the wing - it wasn't as fiddly a job as I'd first suspected.

 

Edited By Andy Sephton 1 on 08/06/2019 11:17:19

Edited By Andy Sephton 1 on 08/06/2019 11:18:28

08/06/2019 10:39:32

The wings:

The spars were cut off flush using a jewellers saw with a very fine blade. The root ribs were then tidied with a fine sanding block.

img_0110.jpeg

The jigs for the tailplane and wing tips were assembled. As before, if all the part numbers can be seen on the parts, then two 'handed' wing jigs will be produced.

img_0112.jpeg

Each rib has a ply doubler fitted to its trailing edge. The instructions say fit the doublers after the wing has been built, but I decided to do it pre-build on the middle wing section pieces. It wasn't a good idea as I forgot about the small allowance for the trailing edge and fitted them too far back. It meant opening up the notch in the ply trailing edge a little, so there were no real issues.

img_0117.jpeg

As with the wing centre-section, I fitted the ribs to the spar before adding the assembly to the jig. The spar holes in the root ribs were opened out slightly to cater for the root rib angle.

img_0119.jpeg

After building the centre-section, I noticed that the TE had a slight wave in it. On closer inspection, it appeared that the TE parts were slightly too long. It looks like they've been 'cut to plan' and the slight inward tilt of the root ribs has not been taken into account. You can see the difference between the notch for the rib and the root rib in the below pic.

img_0120.jpeg

The notch was increased in size accordingly and the TE added to the wing.

img_0122.jpeg

 

With the wings still in the jig, the LE was added with scrap balsa holding it in place until the glue dried.

 

img_0125.jpeg

After removal from the jig, the riblets were added using the comb as a guide. I used the plan for the centre-section, but I had better luck lining up the riblets with the markings on a cutting matt.

 

img_0126.jpeg

The wing tips were made up in a similar way...but this time, I didn't add the TE doublers.

img_0127.jpeg

The three extreme ribs on the tip panels had to be cut down a little and notched with a round file for the LE. The latter was fixed at the tip first, and when dry, pulled on to the rest of the wing ribs.

img_0137.jpeg

Next post will cover wing joining.

 

 

Edited By Andy Sephton 1 on 08/06/2019 10:54:47

08/06/2019 10:08:55

Thanks Dwain - I use whatever comes to hand in a very crowded workshop. I've been modelling continuously for over 60 years and in that time one tends to collect a lot of @@@@.

Anyway, we digress. I've concentrated on the build over the past two weeks and to my horror, I found some 47 photos of the build that I haven't yet posted. I'm not sure how many are allowed in each post, so I'll probably spread them over a few, collating them as to relevance. The build, of course, was done with the various parts progressing in parallel rather than series.

So, here goes....

The fuselage:

Following on from the last post, the wing retaining nut was epoxied into it's laminated ply plate and left to dry:

img_0106 2.jpeg

The fuselage sides could then be mated. The instructions say fit the formers on one side first, but such was the accuracy of the laser cutting, it was possible to assemble the fuselage free-hand in one go. I stress that I made constant checks as to the 'squareness' but it all fitted together very nicely with no apparent errors.

img_0107.jpeg

The underside was then added:

img_0109.jpeg

Here's a nice touch from the designers. They've added a blank servo tray to the laser cut sheet so you can cut your own holes to suit your own servos.

img_0111.jpeg

Next job was to make up the hatch. To ensure a good fit, the parts were joined using a straight edge:

img_0113.jpeg

The whole was then laminated and stuck to the ply rails - you'll find the assembly under the clamps if you look hard enough...

img_0114.jpeg

With the hatch completed (and the retaining magnets epoxied in place) the remaining upper surface sheeting could be added. The nose block has also been fitted in the following photo:

img_0115.jpeg

This lead to a quick trial fit of the centre-section, which went together well - so far so good!

img_0116.jpeg

There's no more pics of the fuselage construction, I'm afraid. Suffice to say that the rear fuselage boom was epoxied in place, the snakes dry fitted with foam 'rammed' up the back end to support them - see plan 'Schaumstoff' is German for foam) - and the fuselage to boom fairings were fitted. The whole was then sanded ready for covering.

Thread: S1581 Hawker Nimrod MkI
07/06/2019 14:03:30

The weave on that silk looks very 'open' Danny, it's not surprising it's taking a lot of dope. As you say, maybe Solartex would have been better ... or maybe nylon or bias binding?

Thread: Slite V2 build thread
27/05/2019 19:32:06

There was not much happening today, so I could get on with the build.

I fitted the leading edge earlier, but there's no photo of that. Suffice to say that there was no issue noted.

The first issue quickly appeared, however, and that was how to stick the trailing edge (TE) onto the wing. The instructions call for thick cyano, but a dry fit took me well over a minute to achieve (and I broke two ribs in the process), so the glue would have gone off way before I got the TE into position. I tried removing the jig from the board and turning the assembly over, but the tabs either fell through or came out of the jig putting a nice twist into the wing.

In the end, I fixed the TE at each tip with cyano with the wing flat on the bench. The board was then put into an upright position and clamped, giving me access to the underside of each rib where I could get some cyano into each joint and clamp it as I worked down the wing. The two missing clamps in the pic are the two ribs I broke earlier. these were fixed later.

Note that the TE overhangs the building board to allow the clamps to be fitted.

img_0086.jpeg

Back into the horizontal position with weights to keep the tabs touching the base board. (a Merco 61 and a Laser 70, if you're interested)

img_0087.jpeg

While that was drying I made up the spoiler and spoiler box

img_0088.jpeg

The wing could now be removed from the jig and the riblets fitted. The instructions (somewhat glibly) say, align the riblets with the help of the rib-comb and glue them in place. Easy to say...not so easy to do! Two combs would have made the job a lot easier. Anyway, we got there in the end.

img_0091.jpeg

With the riblets done and the spoiler box dry, the latter was fitted to the wing. The clamps are an Aldi special - 10 small and 10 medium clamps for £1 in the gardening section - they double up as plant ties.

img_0092.jpeg

The laser cutting tags and some of the laser discolouration was taken down with a home-made sanding block - I use double sided tape to fix the paper to the balsa.

You can see how thin, and therefore vulnerable, the rear end of the ribs are - if you build this model, you really do need to take care.

img_0093.jpeg

.....and the lower ply centre-sheeting was glued and clamped in place. The instructions say use cyano, but I'm allergic to the stuff and prefer aliphatic, which is what I used in this case. Aldi clamps again.

img_0095.jpeg

While that was drying, I laminated parts F37 and F38, making sure to create a handed pair, to make up the doublers around the wing mount screw hole.

img_0097.jpeg

For some light relief away from the wing, I started on the fuselage sides - the instructions remind that a handed pair should be made. A nice touch is that if the parts are stuck down with all the numbers showing in the same orientation, then a handed pair will result.

img_0098.jpeg

By now, the fuselage bottom sheeting was dry, so the front top sheet was applied and the screw-hole doublers fitted. The hole has not yet been drilled.

img_0100.jpeg

With a bit of time to fill in and space available on the building board, the two middle wing jigs were laid down. Again, if all the part numbers can be seen in the correct orientation, a handed pair will result.

img_0103.jpeg

Wing middle section rear sheeting is now fitted. I had to cut about an inch off the back to fit it to the wing - the instructions do mention that the parts should be 'adjusted' - I take that to mean cut-to-fit.

img_0104.jpeg

...and finally for today, the fuselage former R11 has been laminated from two similar ply parts.

img_0105.jpeg

Edited By Andy Sephton 1 on 27/05/2019 19:39:23

27/05/2019 19:04:32
Posted by Martyn K on 27/05/2019 10:16:22:

Thanks for starting this thread Andy. Following with interest

 

What size and wall thickness is the carbon spar?

 

Martyn

You're welcome Martyn.

 

The centre section spar is 10mm od and 9mm id, the LE is 2.5mm and 1.5mm

The mid panel spar is 6mm and 5mm, the LE is 2.5mm and 1.5mm

The outer panel spar is 6mm and 5mm, the LE is 2.0mm

the tailplane spar is 3mm and 2mm

Edited By Andy Sephton 1 on 27/05/2019 19:04:58

Thread: F3-RES
27/05/2019 11:13:57

Thanks for the support Martyn ... you are, of course, one of the three modellers I know with an F3-RES model!  ... and you did point me towards this class of model in the first place!

 

Edited By Andy Sephton 1 on 27/05/2019 11:14:50

Thread: Hawker Fury Mk1 Replica, K1930 (OO-HFU)
27/05/2019 11:07:22

I've been doing a lot of small jobs since the last posting. The odd pic has been taken and the results follow:

The capping strips have been added to the wings and the servos screwed into position on the top wings:

img_9877.jpeg

The bottom wings and empennage have been sanded to shape

img_9883.jpeg

I've bent the tail skid wire to shape, bound it to the rear fuselage and completed the rear fuselage sheeting

img_9897.jpeg

img_9899.jpeg

I've decided to mount the tailplane horizontal rather than at the incidence shown on the plan. I believe the latter is due to the hole in the three-view being at an angle to allow movement of the tailplane on the full-size for trimming. For normal flight, the tailplane would be horizontal, so that's how it'll be on my model. It should work out OK, but time will tell....

It would have been a first if the fuselage stringer slots had been in line - accordingly, the slots were widened using a steel rule and modelling knife!

img_9955.jpeg

The stringers were then added to the rear fus:

img_9966.jpeg

Wire bending for the centre section and undercarriage struts. I've used an engineers vice, 2kg mallet (to guide the wire into the required bend), and a hacksaw. My technique is to lay the wire on the plan and mark the centre of the join. The wire is then set in the vice with the marked point about 2mm or so proud of the jaws. The bend is then made and the result compared to the plan. With the knowledge of the relationship between the required bend, the actual bend and the mark on the wire, the next bend can be carried out with accuracy.

Also, when bending symmetrical shapes, I try to make the bends symmetrically rather than in series. Again, this helps making a symmetrical result.

img_9994.jpeg

...and here's the result":

img_9996.jpeg

With the tail skid and sheeting in place, I did a rough balance of the fuselage and discovered that with the servos behind the firewall, the model was too nose heavy. The Servos have, therefore, been moved to the cockpit area, which has allowed a better run for the control wires. The rudder closed loop has been dry-set up.

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