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If WW1 had continued into 1919 - - - - - The Le Pere LUSAC 11

This would most likely have been a very important plane on the Western Front

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Colin Leighfield06/05/2018 20:59:11
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5405 forum posts
2219 photos

Thank you Chris! The cock-up with the upper wing position means that it is going to need 10/15 gms of nose weight to get the c of g right, which is a lot on something like this. Therefore I won’t add the scale detail such as rigging, guns etc until I have sorted the wings out later. I will probably remake the wings completely, (if it comes back in one piece next week), I’m not happy with them.

Colin Leighfield12/05/2018 10:30:06
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5405 forum posts
2219 photos

I’ve done the usual pre-proper test flights in our cul de sac, very risky and not sure whether the neighbours are laughing behind the curtains or quietly ‘phoning for the men in white coats to come and take me away. The stupid and inexcusable cock-up that has positioned the top wing about 1/2” too far forward has taken 20mgs of nose weight to get the c of g to anywhere close for flying purposes and taken a planned flying weight of about 80 gms up to 100, no good at all. Even so the tiny geared motor with a 1S 160 mah Lipo gets it off the deck sharpish. However it is clearly longitudinally unstable and needs to be fixed properly. There won’t be time to make the proper wing alterations for tomorrow so I won’t attempt a flight in the hangar at Shawbury, that clearly will be asking for trouble.

I will persevere and make a proper job of this, I think it is promising and might even go to the lengths of making some built up wings. We’ll see.

Colin Leighfield23/05/2018 22:32:30
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5405 forum posts
2219 photos

4cc60298-215f-49fa-9cf9-4ac9801f605d.jpegRushing things never pays and the attempt to knock the wings together quickly by simply curving 3mm Depron and adding light ribs didn’t work this time, whereas it worked well in the BipeOne. I used too much undercamber and in the process of using a hot air gun to assist the process of curving just finished up with wings that were distorted in all of the wrong directions. To top it all my “eyeball engineering” completely messed up by fitting the top wing too far forward.

This time I have carefully drawn it all up to ensure that when everything is fitted together it will fall correctly into place. Also,the wings are now double surfaced, with 1mm Depron lower surface and 0.5mm Depron upper skins. Ribs are 1mm Depron, cabane and interplane struts will again be 1/16”” balsa. Here is the bottom wing going together. The full size wing uses a typical WW1 fighter aerofoil section, thin and slightly undercambered. I have used the scale section this time, although I have drawn a straight line across the undercamber to create a flat bottom for simplicity of construction. This wing has come out spot oncb9493a3-d2c6-4011-93c9-24f707c21742.jpeg, absolutely true, no warping or twists, so I am happy with that.

Colin Leighfield07/06/2018 11:46:26
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5405 forum posts
2219 photos

57ba7c09-a43f-4b24-85ce-4b137c086fac.jpege53ae539-eb1a-4420-946d-8fd0b932c4a6.jpegcd498cb2-fbb1-4231-8c58-110be4d8239c.jpeg348263fa-b2dd-417a-b69e-436926902781.jpegThe wings have gone together well and the whole thing is both more accurate and more likely to fly than before! The amount of cutting and alteration has left it looking a bit sorry for itself but that will be sorted out. I’ve set it with 0 degrees incidence on the lower wing and 2 on the upper, giving it a mean of 1degree which I think should be about right.f7dd47d3-391f-4035-b252-2bd17ec5797a.jpeg

Colin Leighfield12/06/2018 15:20:25
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5405 forum posts
2219 photos

2c82564d-a59d-46d6-bbba-e86f36b6ee8e.jpegReady for detail now, rigging, guns etc and painting. It looks right and is scale accurate. The problem will be the usual one, weight. It is now 90 gms with battery and that doesn’t leave much to play with. I think if I want a serious version for next year it will have to be balsa and tissue. Even so it’s an interesting exercise in small scale modelling.fb279dda-04cb-4919-9ecf-2dc5be7f79cf.jpeg

McG 696912/06/2018 17:45:13
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2077 forum posts
887 photos

Very nice little bird, Colin.

I will look great with its final deco scheme. yes

Cheers

Chris

Colin Leighfield13/06/2018 15:24:01
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5405 forum posts
2219 photos

Thanks Chris. I don’t think it is of great interest, but there is certainly a fascination to me in bringing something like this back to life after a century or so. It has a lot of period character and would be well worth reproducing in a larger version.

Danny Fenton13/06/2018 15:33:59
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8491 forum posts
3443 photos

I look forward to this flying at Shawbury later in the year Colin

Colin Leighfield13/06/2018 23:53:45
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5405 forum posts
2219 photos

Thank you Danny, fingers crossed.

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