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Member postings for Mark Elen

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

Thread: Grumman American Cougar
17/06/2020 09:58:50

Thanks John,

All of the comments regarding the weight of this thing have been playing on my mind the whole way through this build. Not any more.
Last night, I picked up the 2015 summer special edition of RCM&E - the one with Tony Nijhuis’ electric de Havilland Mosquito. It’s span is 72 in (shorter than this) wing area is 5.2 sq foot (less than this) and it weighs in at 14 lbs! (Dennis Tapsfield got his Cougar built to 9.25 lbs)

Tony gives the wing loading as 40 oz/ sq foot (although, by my reckoning of the above figures it is more like 43)

If I can get somewhere close to 9.5 lbs, I will be happy.

Cheers

Mark

Thread: Chris McG F-86 Sabre Dog build blog
14/06/2020 11:20:22

Hi Chris,

Either of those two will do the job and as long as it isn’t really hot while you are doing it, will give you time to get it in the right place and pinned down.

If it was me, I’d be using Aliphatic. (The normal stuff, not the superphatic)

Cheers

Mark

Thread: Mark’s Peggy Sue 2 Build
13/06/2020 21:24:43

Hi Peter,

Hope you are keeping well.

Here is a photo of MK2 wing. I have made a better job of this one. I took the opportunity to tidy up a couple of bits that I wasn't happy with on MK1.

43b5fdbe-ea14-4945-8a51-3fd9a0b13775.jpeg

I'm just hoping that the wing retaining holes will marry up with the t-nuts in the fuselage.

Cheers

Mark

13/06/2020 20:39:29

Thanks Gents for your comments.

I like that Peter.
I have been a bit quiet this week, as with the decision made, I have got most of the new wing built.
I was never going to be happy, bodging the old one back together, maybe if it had solid coloured covering, but with the transparent scheme, it was a non starter.

It has been a whole lot easier building it the second time, as it was so recent, I haven’t been scratching my head and having to work out how to approach each bit. I have also been pushing myself to get on with it with the mantra ‘wing in a week’, where normally, I would ‘leave that till tomorrow’, I have been thrashing it out and getting it done.

Anyway, it’s well on its way. Hopefully, this one will last a bit longer than 1 day.

Cheers

Mark

Thread: Grumman American Cougar
10/06/2020 22:53:33

Hi John,

Thanks for your comments.
I haven’t got a lot more done in the last few days, I have put this to one side, to see if I can ‘build a wing in a week’ for the Peggy Sue 2, to replace the one that got damaged on its maiden day.

One thing I have definitely decided though, is that I’m not going down the fibreglass route for the nacelles. At 76 inch span, 815 square inches and with a target weight of 9 and a half pounds, by my reckoning, that gives a wing loading of 26.85 oz per square foot.

Reading some other twin blogs, and seeing a couple with a shorter span but coming in well over this figure, has given me a bit of reassurance. Although, I have just ordered some ‘contest grade’ 3/8” and 1/2” to make the nacelles with. Talk about ‘Equador Gold’... it needs to be, the price of it.

Cheers

Mark

06/06/2020 18:12:21

I have got on with that today, a couple of hours work and its nearly done:

f0712872-7243-4fc0-9c21-fda315e3d687.jpeg

6b8d3d0c-b34c-434d-80d0-26d4b73a7196.jpeg

d3af53cf-1fb1-4df8-9f2d-5e81414b19e1.jpeg

The 2 solid block stabilizers on the scales are 75 grams - without any joiners, that 1st half with the joiners, but no top sheeting came in at 28 grams, so it looks like I'm going to save a little, I only hope my nagging 'nose heavy' intuition isn't correct.

I'm now reconsidering having a go at the fibreglass nacelles. If only I could make a decision.....laugh

Cheers

Mark

06/06/2020 11:08:50

Hi Gents,

Thanks for your comments. I used to be indecisive, now I'm just not suresmiley

I have now swung back around to the built up idea. I have had a re-jig of the design, and have decided to keep the rear spar, but it is now spaced 1/4" forward of the rear 3/8 block that will hold the hinges. I have decided to laminate 2 x 1/8 bass joiners and they will fit between those two.

The front spar will have a 1/8 bass joiner each side. It will be interesting to get this on the scales, along side the sheet tail that is nearly complete.

6c4dd4b5-8448-4809-9c4e-3e187a738b1f.jpeg

b0f4d4ae-bcb0-4736-9a78-1074504b1f99.jpeg

96cae009-69b8-45c9-afd0-3153a6c6dd8e.jpeg

I have used aliphatic for all of this.

Cheers

Mark

05/06/2020 23:53:15

OK,

So, my instinct all along has been that this will turn out nose heavy, so I have decided to build the tail plane as per plan. If it turns out heavy, so be it. It won’t fly much anyway....I always say, 90% of my enjoyment of the hobby is building, rather than flying.

If it’s anything like my last effort, it will end up in bits (not of my doing) on its first outing.
I will laminate up the tailplane dihedral brace, as per Johns comments.

I have got the majority of it made tonight, but no photos.

Cheers

Mark

05/06/2020 19:00:04

Hi John,

Thanks for your comments.

The 2 pieces laminated together sounds like a plan.

Cheers

Mark

05/06/2020 18:48:04

Hi Danny,

I have 1/8 and 1/4 Bass, 1/8 Spruce and both 1/8 and 1/4 Birch ply

Cheers

Mark

05/06/2020 18:39:37

Hi Danny,

Its 28 inches.

Cheers

Mark

Thread: Chris McG F-86 Sabre Dog build blog
05/06/2020 18:32:37

Hi Chris,

Still following along and enjoying your build. Beautiful. yes

Cheers

Mark

Thread: Grumman American Cougar
05/06/2020 18:30:17

Hi Danny,

Thanks for your kind comments. The braces are shown on the plan as hardwood, I have 1/4" bass and spruce in stock, but am toying with the idea of using 1/4" ply, what would you recommend?

Cheers

Mark

05/06/2020 18:19:05

I have got a little more done today.

I hinged up the rudder and got the top piece glued into place:

f9b61437-8071-44bc-be75-525334ba8343.jpeg

It still needs sanding down to shape.

Then I got out the wing plan and traced out the horizontal stab profile and set to work drawing out a built up version. I'm not sure if my designing skills are up to scratch, but here it is:

a734f35b-7ed9-4069-9ee9-07a42492d1d8.jpeg

I'm going to have a go at it and see how it turns out.

Cheers

Mark

Thread: Mark’s Peggy Sue 2 Build
02/06/2020 22:34:40

Thanks gents for your comments.
After a stiff drink tonight, it all doesn’t seem so bad. The plan now is to build a new wing for it, I wouldn’t be happy bodging it back together. There were a couple of bits I wasn’t happy with.

The tail end will get cut and sanded out and a new one put in.

I have ordered the wood for the wing tonight, but it may be a month or so before I see it. At least while I’m waiting for that to arrive, I can get on with the Cougar.

I still can’t believe that of the 5 or 6 models on the flight line today, mine was the only one picked up and chucked about....I must have done something wrong in a past life😂 Either that, it PS2 just wanted to fly😂

Cheers

Mark

02/06/2020 16:22:13

Today was finally the day to maiden the PS2. I flew the Ballerina a couple of times before just to get my eye back in.

I have to report that it flew beautifully, a couple of clicks of down and a couple of clicks of left aileron and it was flying a treat.

I landed and took out the trim and flight 2 went better, by flight 3 I was getting comfortable with it.

Then came the calamity..... while it was sat on the ground, in the restraint that our club use for starting, there was the biggest gust of wind, a bit like a microburst, but we all think it may have been a thermal, it got picked up, flew backwards past me at about head height and landed upside down on a field box next to me.....

I am not at all happy tonight. It has snapped the wing, all 3 spars at the junction of the aileron and snapped off the starboard horizontal stab.

6ed76b53-6d56-4215-ba15-338fb6e0718c.jpeg

4760a742-f91f-463e-a056-4b6565a8b520.jpeg

5935a5c0-7d16-4386-a9ec-c710531de71b.jpeg

Did I say that I'm not happy...

On the plus side, it has given me a chance to destruction test the hinges. Gluing them in with superphatic definitely works… they won't come back out - any of them.

Cheers

Mark

Thread: Grumman American Cougar
01/06/2020 22:20:42

Thanks Gents.
I’m going to rename those ‘easy touch’ sanding bars to ‘easy to remove your touch’😂

Cheers

Mark

01/06/2020 21:38:29

Thanks Martian,

I have been slowly plugging away at it in the last few days. Planking and more planking. To be honest, my fingers have been hurting, and being a fibre optic engineer, I was convinced that I had got a couple of slivers of glass in my finger tips. (it happens every now and then, and is very, very painful, and they are so small and difficult to see, even harder to remove.)

I then realised what had happened. As I have been sanding the bevels onto the planks, I have sanded my fingertips off......

365e5953-0ba1-46f3-8357-6ca432b15cde.jpeg

not quite as painful as fibre slivers, but not far off.

Here are a few photos of progress:

2054b57f-9070-4c4e-ab4b-321f185e6acb.jpeg

a3040d0e-d74e-4131-86b8-21fc481705b3.jpeg

Those 'stiffener' pieces are very fragile until they get planks on.

71929ae5-458b-4444-aa28-80d42337199d.jpeg

a7159574-fd5b-43c8-8ab1-a42cda9c86c9.jpeg

That's about as far as I want to go, until I get the side pieces on (the stiffeners are going to need some work to get them to fit properly), and I'm still awaiting my wood order, so I put the fuselage to one side and got started on making up the fin and rudder.

This is the one part of the build that I haven't been looking forward to, and have been racking my brain as to how to approach it. In the end, I made up the rear tapered post for the fin and then made up a tapered packing piece, then packed up the front post so that both centre lines were in the same plane, then got started on it:

0c3bc97a-ab0c-4e0c-ae7f-e3e62c43664d.jpeg

ba16176b-b905-4d78-a09b-7b033b66dc9d.jpeg

I ended up using a mish mash of both plans, as the one on outerzone shows the lower fin block sitting on the horizontal stab, whereas, the paper plan shows it hanging in mid air, I started with the view that I was going to follow the paper plan, but then changed my mind and decided that the block sitting on the stab would give a greater gluing area.

33684063-f24e-4ffd-b70a-61252d80d736.jpeg

It turned out OK, not perfect, but passable:

2b781b2f-19d8-4b51-929a-61cc2e3d3431.jpeg

Then today, I have made up the rudder:

66f5055c-c37d-4810-aa75-13f4163f7c3f.jpeg

e543fe9d-d9bc-49e9-a580-871d2fbb2b0b.jpeg

b872eff3-dc3e-4ecb-85dc-9650fea65ef7.jpeg

Note to self..... don't sand off your fingertips. It hurts.....

Cheers

Mark

Edited By Mark Elen on 01/06/2020 21:41:00

Thread: Gary's Brian Taylor P-47 build
27/05/2020 23:17:47

Hi Gary,

It’s good to see your build progressing. Your tail wheel looks great. Don’t worry about the ‘agricultural’ bit, the fact that it works is more important. You can finesse the looks later (or on the next one)

Keep up the good work

Cheers

Mark

Thread: Grumman American Cougar
27/05/2020 23:07:20

Hi Gary,

Thank you for your kind comments.
As this is my first go at planking, I’m by no means an expert, but it appeals to me and I am enjoying it immensely.
It’s really just a stab in the dark, to see what works and what doesn’t. At the moment, it seems to be going OK. The front planking has sanded down nicely, and I’m very happy with it.

Cheers

Mark

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