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Member postings for Martyn K

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

Thread: Fokker EIII Scratch build
19/02/2018 15:55:59

Thanks Gordon

Reference 3. This idea came from my free flight contest day where we would wash-in the inner wing panel slightly (0.5 degree) to hold it up in a tight circle. The inner panel flies slightly faster than the outer panel. In the event of an upward thermal gust, the inner panel stalls, then drops, the model wheels round very quickly thus tightening up in the thermal. The trick is to get that inner panel to fly at optimum L/D so that it is not causing unnecessary drag and potentially making things worse,

For clarity - assuming a 4 panel wing, Both Wing tips would be washed out an equal amount. The Outside turn inner panel would be flat and the Inside Turn Inner Panel would have a touch of Wash in. You set the incidence (AoA) by adjusting the CG and then the tailplane for a flat glide. Much easier than flying these little scale models.

Martyn

19/02/2018 13:59:25

Thanks Gordon. I'll persevere with it 'as is'. Your Avro does sound very similar.

 

There are a few jobs I need to do before the next flight

1. Add a little Left thrust (engine runs backwards to convention) to help counter the drop right characteristic.

2. Increase wing twist throw and differential

3. If that doesn't work, couple Rudder with Aileron but with Aileron working backwards - so the inboard wing has SLIGHTLY more positive incidence on a turn to hold the wing up

4. If that doesn't work I'll fly it at the field where I can get some height and experiment a little more fully. A very calm day

Should be fun to try and sort it out. Flying indoors is very unforgiving for trim flights

 

Martyn

 

Edited By Martyn K on 19/02/2018 14:00:06

Edited By Martyn K on 19/02/2018 14:00:43

18/02/2018 21:24:40
Thanks Colin. Really nice to put a name to a face. Appreciate you publishing the photos as well. My thoughts

The most difficult thing I have ever flown. I got 6 or 7 flights in although some were very short. CG was a bit too far forward to start off with which meant I ran out of elevator authority when i slowed up and the model went a little nose heavy. Taking 5g out of the front sorted that and then I ran into problem 2. It didnt want to go round corners. Twisting the wing - aileron - just induced a slight rocking motion so i was on the rudder for some consistent left hand circuits. Flying at cruise it was hands off the elevator but it was very twitchy. Full power climbs were quite nice - not overpowered so the power train is about right and quite nice. Take off runs were quite easy to keep straight. It all went pear shaped though when I tried to turn right. The prop turns CW and kicking in right rudder caused the nose and right wing to drop alarmingly and with ineffective ailerons only the floor was going to get in the way.

Coupled with a Rx that was causing a twitchiness and i had one very bad glitch on the last flight resulting in another hard arrival and I then called it a day.

Being positive, it flew and I thought it looked great in the air. It has survived most of the abuse i have thrown at it with just a little damage except for a bit of broken leading edge that will need replacing. That will be tricky to get a decent colour match. The bad news is that it needs further trimming and the wing warp travel increasing. I'll see how I get on this week but I am not optimisic it will be sorted before the nationals in 13 days time.

A little bit disappointed but it is a challenging subject.

Martyn
16/02/2018 16:23:41

Gun was assembled last night

gun2.jpg

and this morning added the (real) bullets and weathered it a bit.

gun1.jpg

A couple more hatches to add yet but probably not before Sunday

Martyn

Thread: RES-Eagle Glider RCME March 2018
16/02/2018 09:28:27

I get my carbon tube from Hyperflight

Martyn

Thread: Fokker EIII Scratch build
15/02/2018 16:14:06

Deffo. You will be able to see them

Thread: Solarfilm
15/02/2018 15:15:33

I think I will be trying Silk on Mylar as a replacement for Solartex. Far lighter and it comes in whatever colour you can get.

Transparent Mylar is available from Freeflightsupplies.co.uk and is a reasonable price. Silk on the other hand comes in many colours and is cheaper and lighter than solartex. Just spotted that Mike also sells lightweight Esaki Silk as well but his is quite expensive

Silk on Ebay

Apparently the trick to apply the film and shrink it then apply the silk wet on top to remove any air bubbles then use dope to seal and shrink it. Should be fun..

Martyn

Thread: Fokker EIII Scratch build
15/02/2018 14:45:51

PS. It weighs 129g less battery (another 13g). I think it will need 5g of nose weight to get the CG to a safe place - currently about 25%MAC

15/02/2018 14:44:18

Rigging was done last night.

rigging1.jpg

Amnesia fishing line and aluminium crimps that conveniently pretend to be bottle screws

rigging2.jpg

The rigging around the undercarriage was tricky as I hadn't built any hooks into the assembly. The u/c rigging holds the wing rigging in place.

rigging3.jpg

I have a compass. It looks totally naff so will be tarted up a bit. Metal walkways are silver tissue

The gun cooling heat shield has been cut from a sheet of A4 paper

gun-cut.jpg

Sorry its not sharp. Its about 30mm square. That will be painted black, wrapped around a cling fill wrapped former and then glued and a bit of PVA rubbed into to stiffen it - which will mean a second coat of paint probably. Need to make the barrel, sights and firing mechanism and ammo feed with real bullets.

Hopefully done before Sunday.

Finally, this is the effect I would like to get to. Clearly not a replica of a museum aircraft but it looks absolutely fab. And its 1/48 scale. I don't think I have the airbrush skills for this though

model_eiii.jpg

Not much more to come

Martyn

Thread: Vac forming
15/02/2018 10:31:36

This makes it look so easy

Martyn

Thread: Lidl Sander
15/02/2018 08:14:52
Posted by Handyman on 13/02/2018 11:58:59:

You can also get Gorilla Wood Glue that is white and dries a natural colour. is water resistant and for a litre bottle, it only costs £12.50 with free delivery. It has the same glueing power as the brown Gorilla glue and seems to be a better deal.

You can view the product at,
gardenersdreamuk (163526 Feedback score: 163526

Worth a punt in my opinion, have got some on order!!! A 1 litre bottle for £12.50. Comes from Glasgow!!!

They are different types of Glue. The Wood glue appears to be aliphatic, The brown glue is a foaming polyurathane type adhesive.

Both are very good and have their (different) uses in the shed.

Martyn

Thread: Vac forming
14/02/2018 17:10:36

Thanks Denis. At least I know what to buy..

Thread: RAF's Finest Biplane? Hawker Fury MkI
14/02/2018 16:14:43

I bought 10m of Natural Solartex - (which I think is unpainted) - as I think I'll have to paint it anyway. I wouldn't expect to use more that 3-4 for this model (I hope)

Martyn

Thread: Tony Nijhuis 72 Mosquito Build Log
14/02/2018 15:58:27

Superb..

Great build

Thread: Vac forming
14/02/2018 14:22:54

What thickness is recommended for a largish (20" long) caopy?

Martyn

Thread: Fokker EIII Scratch build
14/02/2018 11:46:48

Thanks all for your comments.

Gordon - The rudder and elevator horns were carefully measured so they would just fit into the quadpod at the rear. There is less that 0.5mm clearance on the rudder horn. Have to admit they did vanish quite nicely and most unexpectedly.

Bob - Wingspan is just over 30" - so its not tiny but it certainly isnt large. I still haven't weighed it - I have that pleasure tonight

Stephen/Colin - thanks. Its about 2.5 moths since I started. Been quite an enjoyable build and despite my best attempts I haven't actually broken it. The Hornet moth I built last year was a bit too fragile. This is larger and I have deliberately made it tougher. My clumsiness is getting worse unfortunately so I have to make it me-proof.

Edited By Martyn K on 14/02/2018 12:01:15

14/02/2018 11:40:06

A bit of progress

I spent a couple of evenings carefully handcrafting the font for the serial number. Plotted them out using my Silhouette - carefully placed the masks in place and sprayed with a couple of coats of Satin black

fok345-16.jpg

Apart from it looks unsightly, I manage to tear the tissue as well.It would be an understatement to say I am very unhappy about that.. I have managed to tidy it up but its not right. To put it into perspective, the 16 is 3mm high

Carry on regardless.

The cockpit doesn't have much in the way of instrumentation

cockpit1.jpg

and

cockpit2.jpg

and hot still looks too much like the archetypal English country gentleman

otto2.jpg

Getting the metal turned finish on the aluminium panels was a challenge

tooling.jpg

Its not normal English WW1 round tooling - far more random. Its Silver Esaki tissue - doped - with a thin coat of hand brushed silver loaded paint then scribbled all over with a silver felt tip marker. Takes a lot longer than it took to type that. About twice as long.

A feeble attempt at stitching. The EIII had a single fabric covering stitched underneath over the rear fus. It appears that once it left the factory riggers seemed to choose their own stitching method. Mine is purely illustrative but in hindsight I wish I had done it differently. Couldn't find any 1/12 scale eyelets so it was a good excuse not to add any.

stitching.jpg

Next job is the gun. I have cadded up a cut pattern for the Silhouette and tis will be cut out of cartridge paper and then sprayed black

gunpattern.jpg

Tonight I will probably be rigging the beast and setting the CG ready for maiden on Sunday.

 

Now getting rather nervous.

 

Martyn

Edited By Martyn K on 14/02/2018 11:47:33

Thread: Ferocious Frankie- Brian Taylor P-51
13/02/2018 13:19:24

Following... another on my to-do list.

 

Is that the -B or -D variant CSB? 

Martyn  

Edited By Martyn K on 13/02/2018 13:22:08

Thread: Co2 Motor head
13/02/2018 13:16:56

I thought the Telco adjusted its running speed by altering an offset nut on the front of the crankshaft which raised or lowered the crankshaft thus restricting the amount of CO2 passing into the cylinder.

I have a brand new one here I have just looked at. Mine has a metal cylinder head

Thread: RES-Eagle Glider RCME March 2018
13/02/2018 11:07:54

Although not mentioned in this months RCM&E, I think the model is compliant with the F3-RES rules that are used across Europe and USA. Its a great beginners introduction class into competitive thermal soaring. BARCS runs a postal event for the class. Please PM me if you are interested

Martyn

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