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Old Sep 23, 2004, 06:20 PM
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Wareham, Dorset, UK
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Repair of a foam wing core

Here are some pictures which may be of interest:
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Old Sep 23, 2004, 06:23 PM
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The grooves are filled with lightweight filler and thenleft to dry for about 6 hours.
Flatten the surface with 120 grit paper and you will end up with a nice smooth surface.
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Old Sep 24, 2004, 09:12 PM
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And the whole process only takes a few minutes. It's the filler which counts!

Klaus
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Old Sep 27, 2004, 02:35 PM
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Wareham, Dorset, UK
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Use NACA 63series profiles for models

Quote:
Originally Posted by rcjetpilot
Did you consider, or have any experience with the NACA 63Axxxx series? Bob
Hi Bob

I found some pictures of the e-Trainer model which I designed and built when in Norway in 1988/1989. For this I used those sections for the first time. To me they look very similar to some of the Quabeck profiles.
The model was powered by a geared SP600 motor on 12 cells. Flew very nicely, even by today's standards.

Fans rule! (these days)

Klaus
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Last edited by winmodels; Sep 27, 2004 at 02:41 PM. Reason: Two pictures were too large
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Old Sep 27, 2004, 04:08 PM
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That's a nice looking airplane Klaus, very nice lines.
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Old Sep 27, 2004, 04:36 PM
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Hi Ed

it's a 1:5 model of what I once planned to become a single seater kit plane. That plan died when I startet to realise the cost involved. When the model flew so nicely and docile as I had hoped, that was enough satisfaction for me at the time.
As a model it may have done better, but nobody seemed to be interested in those days. I stiill have moulds for the fuselage - so maybe sometime?

Regards

Klaus
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Old Nov 15, 2004, 01:29 PM
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looks real good, keep progress reports going....by the way wear do you get the blue foam- supplier ( website/phone no) and prices?
mike
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Old Nov 15, 2004, 01:57 PM
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Quote:
Originally Posted by electricvirus
looks real good, keep progress reports going....by the way wear do you get the blue foam- supplier ( website/phone no) and prices?
mike
Hey electricvirus, sorry Mike - Bournemouth - in Dorset - did I see right?

There are several foam suppliers in the area, some ridiculessly expensive.
I found Southern Insulation in Southampton the best (pricewise, and they even sell you one sheet only). The are near the B&Q off the M271.
You are right, I should actually do some progress reports - perhaps next weekend. At the moment I'm more concerned with progress of my WM600 EDFs. Lots of work to prepare for series production.

Send me a PM with you phone no, if you want, some chat on the line can be encouraging.

Have fun with fans

Klaus
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Last edited by winmodels; Nov 15, 2004 at 07:40 PM.
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Old Nov 15, 2004, 04:28 PM
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Hi Klaus,

I missed your updated post on the 63A airfoil, the additional information is greatly appreciated. And I must say the build-up fuselage work is stunning. She must have been a pleasure to fly.

Bob. Enjoying E-power!
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Old Nov 17, 2004, 04:36 AM
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bournemouth, UK
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thanks klaus, i shall try them when i finish my week of night shifts, i'm an itu nurse ....week off then!!! , then some quality jet building.
good luck with your project.
mike
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Old Nov 25, 2004, 06:24 PM
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wings in the making

Hi,
slow progress on the Cobra400 (there is a lot of work on the WM600) and I had also some problems with the inlet ducting - I baked it at too high a temperature.
Here are some pictures which show the making of the wings. I put the pictures up first and write the comments afterwards:
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Old Nov 25, 2004, 06:29 PM
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Not much to comment really, I use balsa spars let into the foam. This sequence shows how it's done. Mark out the position, arrange a guide rail and cut. Fit the spar dry, to see how it fits. If necessary clean out the groove with some sandpaper glued to a piece of wood - last picture
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Old Nov 25, 2004, 06:31 PM
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And the next:
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Old Nov 25, 2004, 06:36 PM
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The spar is fitted in position with epoxy and micro bubbles mixture. I use a rather thick mixture to save wheight. When the epoxy has set smoothe the whole over with light weight filler. In this case I use 80g/m^2 glass fabric and use a roller blade for cutting.
The glass is then draped dry onto the surface. It should lie smooth and flat on the wing surface.
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Old Nov 25, 2004, 06:40 PM
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Skinning the wing - not the cat

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