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Member postings for Lindsay Todd

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

Thread: header pipe
18/05/2019 21:35:19

Hi John, from memory I have a figure of about 14 inches from the piston centreline to the cone on the pipe however this will depend on individual motor, prop and fuel being used so some experimentation will be required by starting with a longer section of connecting silicon tube and reducing the length say 1/4 inch at a time whilst checking for peak rpm and throttle response. hope that helps. Lindsay

Thread: Matt's renaissance build
12/05/2019 21:21:49

Nice one, it struck me that a biplane version would work well. Lindsay

Thread: Tony Oneilll Renaissance
12/05/2019 21:18:13

Excellent well done hope you enjoy it. Lindsay

Thread: Bristol Blenheim Mk1V
25/03/2019 00:19:03

Hi Monz, thanks for the interest, in due course I hope it will be available, have had a number of requests including some larger versions from the LMA but I have to get the prototype finished first and some test flights done so that is still a few months away. There has been more progress and will update this thread in due course.

Linds

Thread: 2019 Mass Build
06/03/2019 10:08:06

Gents image below is from the original plan sent into the mag, I have identified the centre line and position of first two ribs out, hope this helps clarify any irregularities found. Lindsren.jpg

Thread: Dave Burton (BEB)
31/12/2018 19:25:04

Dave was something just a little bit special, a fellow club member for many years and of course his association with RCM&E magazine and this forum, he was a friend that I will miss greatly. Our thoughts our with his family. Lindsay

Thread: Bristol Blenheim Mk1V
30/12/2018 21:03:59

Sorry not had much chance to update just really busy with work this last year and combined with a few other priorities flying and building has ended up suffering. There is some progress though since the last update, the model has now had its first coat of primer, panel line detailing started, dummy exhaust model has been started from which I will make a mould and cast these in resin due to all the horrible angles and shapes as I will never carve two the same.

the cowls also have a series of dome mouldings and these are being done the same way, again in progress but not complete just yet. There have also been an annoying number of 'hanger rash' issues that have had to be dealt with simply through storage and moving things around so much but everything is now dealt with and glass cloth coated so that should be a thing of the past.

I will update before to long when time allows to update the photos

Linds

Edited By Lindsay Todd on 30/12/2018 21:04:56

25/10/2018 00:47:18

Yes bit embarrassing this has taken so long, house move and restoration largely to blame (still on going but at least its the internals now). Just thought I would add a couple of photos of the cowls with the second row of plates in place just before the finishing resin going on.

24oct18a.jpg

24oct18b.jpg

Will crack on and get the cowls finished now with blisters and details and get the final coat of primer. Will then get both engines mounted and test fit the cowls and then look at the dummy exhausts and ensure the cooling around the DLE 20's is sufficient so quite a bit to do but will get this done hopefully over the next 2-3 weeks.

Linds

Thread: Renaissance by Lindsay Todd
25/10/2018 00:39:33

Hi Nick, sorry still a bit confused as he last photo relates to gluing the u/c plate and underside of nose section that spans across the fuselage and then sanded and trimmed to shape, I can't see a 'wavy line' anywhere. Are you referring to the internal fuselage tray that forms the battery bay and servo tray that has a jigsaw type joint, if so that could be a single piece, its just the way it was designed for the cnc parts and not critical in any way.

Linds

24/10/2018 01:20:57

Hi Nick, sorry not sure I understand the question about the fuzz being scalloped, can you elaborate a bit?

24/10/2018 01:19:51

Hi Dave, re tailplane area, 18-20% of the main wing area is usually a pretty safe bet. Linds

Thread: Bristol Blenheim Mk1V
24/10/2018 01:11:53

Well evidence of some work at last, actually more complex than it might look to create the fins around the edge of the cowls. As I am relying on a clearance to aid cooling the plates need to be set at an angle of about 3 degrees. Fortunately this translated into a 3mm spacer but the down side was that each cowl required 28 trapezoidal plates to be glued in place around the circumference, each one being moistened and clamped to create a slight curve. then marked out and glued in two rows, the second row overlapping the first to create the desired effect.

img_4160.jpgThe plates are made from 0.5 ply and equi-spaced around the cowl with a 7mm overhang and glued at the front edge with pva and taped till dry.

img_4156.jpg

Spacers of 3mm were used to set the angle whilst the glue dried

img_4159.jpg

Lets just say it took longer than planned, the second row of plates now goes on and overlaps the first so its a repeat of the process and there were two cowls to do. I'll photo when dry and then give them a coat of epoxy laminating resin on the outside and run a bead of epoxy and micro balloons into the inside gap to fix there position. So glad this job is nearly out of the way, just some blisters and panel details to follow.

Linds

Thread: Ashbourne Scale Day
24/10/2018 00:47:28

Sadly could not make the change of date due to other commitments, looks like it was a great day, love the video of Ian's Pup. Linds

06/10/2018 21:56:23

Can I come and play too, not got to many events this year for one reason or another. Linds

Thread: Which part of building a new traditional balsa model plane do you enjoy the most?
06/10/2018 21:49:37

For me its always been the design process, working out appropriate solutions and pulling the design together, the build and flying tend to mark the end of a project and I start to think about what next, Covering is my pet hate though.

Linds

Thread: Bristol Blenheim Mk1V
19/08/2018 22:58:18

Yikes over a year since an update but it still lives and the first of the two DLE20 engines has now been bolted in place. I plan to figure all the throttle linkages and tank positions on the first wing and then repeat for the second in mirror image so to speak. Its amazing even with a reasonably larger model how space starts to disappear once critical components start to go in. I will gets some more photo's updated before to long. I think this is my longest ever project now and its been difficult to sustain progress trying to fit it around other things that have had to take priority but I have made some slow progress in recent weeks at least.

Thread: Renaissance by Lindsay Todd
19/08/2018 22:49:52

Had not realised that the build overview had already been released on this site so will close this off as no point in repeating. Linds

https://www.modelflying.co.uk/news/article/building-renaissance/26382

 

Edited By Lindsay Todd on 19/08/2018 22:51:29

06/06/2018 01:02:53

So time to start some sheeting using 3mm soft balsa trim roughly to shape, I then moisten the outer surface to aid the bend and then glue in place with aliphatic glue and pin in place to sides, formers and stringers. When dry repeat for the other side

014.jpg

The sheeting can also be added to the front including around the cockpit using the same technique using pins and pegs to secure till dry and then repeat for the other side. Make the cockpit slightly oversize so you can trim back more accurately to shape later.

014b.jpg

also a good chance to add the 6mm balsa sheeting to the underside front fuselage from U/C plate forward

014a.jpg

leave till dry and trim and sand to shape.

more soon. linds

05/06/2018 00:25:17

Motor bulkhead former F1 and F2 showing the doubler added in front of F2 at the dowel position and triangular reinforcements to the sides. 6mm square balsa has also been added to the lower fuselage edge

007a.jpg

The fuselage sides can now be glued together, at the rear two triangular wedges of 6mm balsa brings the sides together, the top forms the tail plane seat. Clamp till dry.

008.jpg

I use a range of clamps and elastic bands to keep everything together. NB ormer F7 on the bench, I added this once the glue was dry as it just seemed to be easier to locate its position correctly.

009.jpg

Time to add the 6mm square balsa stringers around the upper sections of the formers, these provide support and gluing area for the outer sheeting

010a.jpg

NB the position of the 6mm stringer that sits at that is glued onto the top of the 6mm sheet fuselage sides. these are inset to allow the top sheeting to match the outer edge giving a good glue joint.

011.jpg

The rear top section of the fuselage is made up of a central stringer and then an additional 6mm strip cut to width, a razor plane was then used to shape the strip to match the former profiles ready for sheeting

013.jpg

The section just forward of the cockpit has a series of 6mm stringers to create support and gluing area for the top sheeting. NB the 6mm inset strip does not extend into the area that will become the fuel tank / battery hatch

013a.jpg

Final jobs before sheeting was to add the 6mm marine ply u/c plate as it offers a bit of protection and also add the triangular strip section around the formers and u/c plate whilst we have access

013b.jpg

more soon. Linds

04/06/2018 00:20:41

So a backtrack build blog, so were to start well as most people probably know I start these days by getting a set of parts laser cut by Slec (they are used to my drawings by now) and with a build for a magazine when time is a pressure then it does make life a little easier. All the formers are made from either 3mm light ply or marine ply for parts such as the 6mm motor bulkhead and undercarriage block. Wing spars are made from 3mm marine ply and ribs from 3mm balsa. With this design I have deliberately were possible used as many stock commercial materials and sizes as possible so they should be relatively easy to obtain.

001.jpg

As my article hopefully showed and was produced as the model was being built, put the effort in up front and the build can be straightforward enough, laser cut parts are only as good as your drawings so double check the sizes. I had made a basic error with one mid rear former and needed to cut a modified part during the build, mistakes happen but at least it showed the process warts and all.

The build started by cutting two fuselage sides from 6mm medium density balsa and two wing doublers from 3mm medium density balsa (you could use light ply for additional strength but I was happy to go with balsa)

The laminate gets glued onto each fuselage side aligned with the wing cut out. just remember to make a mirror pair!

002.jpg

Whilst that was drying I sited the engine onto the mount and aligned the mount to the 6mm motor mount bulkhead and marked the position of the holes for the mount, throttle arm linkage and a centre clearance hole for the fuel lines. The little slot in the former is not required for I/c engines but the former was designed around originally using electric power so if the is your route then its a useful addition to feed cables through and add some additional cooling airflow. The motor mount was also fitted with captive nuts to secure the motor simply as it is easier at this stage due to limited access later. NB the balsa additions to the base to increase the depth, again a result of choosing to go IC and the mount had to be moved further back so the former needed extending. As the bulkhead gets fully support this is not a problem but I should have really replaced the former with a full marine ply item if I am honest.

003.jpg

Back to the fuselage construction and with the doublers dry each fuselage side can be pinned to the plan and then the top and bottom rear longerons which are made from medium to hard density 6mm square balsa. These can be cut to size and glued in place to the rebates on the fuselage sides. Take care with accuracy as the top longeron assists in setting the rear incidence on the tail plane.

004.jpg

A 6mm balsa plate is glued to the longerons and forms the incidence line for the tail plane so cut and set with care. Vertical braces again from 6mm medium balsa can be cut and glued in position down the rear fuselage sides. When complete repeat the process for the second fuselage side. (I used the first completed side as a template for the second or you could just draw around it to replicate.

005.jpg

Next job is to fit the centre region formers that include the former that sits at the front of the wing that will carry the wing dowels, a ply plate that is effectively a servo tray and the mid wing seat former. These all have tags and slots so the formers key together and are then aligned to the step at the front of the wing cut out and the top edge of the doubler. Just make sure all is square and glue in place to the first fuselage side. NB the servo tray element again is shown here as a solid plate with a circular hole. This locates to the front battery or tank bay support. I later trimmed away a larger hole to site the throttle servo lower down in the fuselage. This may not be necessary depending on the motor you intend to use but worth thinking about as would be obviously easier to cut first and then glue in place. I used a drill and tapered razor saw blade but without such a tool it would be tricky so again plan ahead if you can.

006.jpg

With the first two formers in place we then need to set the position of the motor mount. The plan shows the position based on the motor I used which was an ASP52 Four stroke however if you measure the distance from the motor mount to the prop boss on the motor and add a couple of mmm you can re set this former correctly to the motor you are using and it will not really affect anything other than trimming the fuel tank / battery support plat to a new size before gluing into place. The cut outs on the sides of the tank or battery plate are for loop and hook straps to pass through and around.

007.jpg

more soon. Linds

 

Edited By Lindsay Todd on 04/06/2018 00:25:04

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