Keil Kraft Falcon - Page 17 - RC Groups
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Apr 03, 2012, 06:30 PM
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Ian Easton's Avatar
Thanks OT for the photos. Earlier in this thread some of the builders were recommending that the cabin area get strengthed to support the wing stresses. I wrapped some carbon tow completely around the fuselage and cabin before adding the sheeting. I saw in your photos that you hadn't done anything extra and thought I'd point it out.
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Apr 04, 2012, 10:23 AM
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What I did towards strengthening the cabin area was to insert/glue cocktail sticks (2mm dia), made easy with a mini drill, at junctions. I also used epoxy resin where I thought appropriate.
In the picture there are 6 on the side (one not seen) and 6 on the top (2 at the front covered over) as well as others underneath.
Last edited by ol Timer; Apr 16, 2012 at 04:15 AM. Reason: Additional text
Apr 17, 2012, 11:49 PM
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Ian Easton's Avatar
I've mounted the tail to my liking. I put a blind nut in the fin (still to sheet the front of it) and have it held in to a piece of ply in the fuselage and an insert into the top of the fuselage. I put a hard carboard tube inside the fuselage to guide the 2" nylon bolt. That way iy wont dissapear down the fuselage at some inconvenint time. The tube also passes through the rear wheel fairing. Some tidying up left to do at the back before covering starts.
Apr 18, 2012, 03:44 AM
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sparks59's Avatar
I like your neat work Ian!
Apr 20, 2012, 03:06 PM
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A nose job

The engine cowl was made by first stacking mostly half inch pieces of sheet along the engine bearers, keeping them together with patches of double-sided adhesive tape.
The assembly was then attached to the engine bearers with same tape.
This was then carved and sanded to the profile shown.
Each segment was then numbered before being carefully prised apart with a steel erase shield (0.1mm thick), to minimise lever marks. I guess a feeler gauge would have done the same.
An electric fret saw was then used to cut the middle out of each segment.
The segments were then glued together as seen in the photos.
Smooth finishing still to be done.
This procedure may be routine stuff to many of you but to me it was pioneer work!
Or maybe there is an easier way?
Last edited by ol Timer; May 01, 2012 at 06:11 AM. Reason: Two pics added
Apr 20, 2012, 03:53 PM
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There could be an easier way, but there could hardly be a way to do it that makes a cleaner job.
That's really nice work!

Apr 20, 2012, 05:15 PM
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Chris Jenkins's Avatar
Nice OT.....looking very good. Keep at it !
Apr 21, 2012, 08:23 AM
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Tim Trick's Avatar
That cowl is looking very tidy. An alternative is to plank the cowl although in the long run I am not sure if it is easier or quicker.

The best method is whatever suits you best and you are comfortable with.

Ian, nice simple job of holding the tailplane down-it shouldn't go anywhere!


Apr 21, 2012, 02:16 PM
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Thanks for the compliments.
And thanks also for the link Tim, I followed it through and wish I had seen the BB Falcon progress much earlier in my build.
Still plenty to do, but should be through before the next snow!
Apr 22, 2012, 03:35 AM
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Ian Easton's Avatar
The servo tray went in today as well as all the connections to them.
Apr 25, 2012, 02:38 PM
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The Falcon plan shows press-studs to attach the engine cowl.
The way I anchor them is to solder a length of safety pin (which solders well) to the male stud and some tubing to the female item. In the latter case it can either be brass or my preference, wire ferrules. The ferrules (with plastic cup removed) are tinned copper tubes with a funnel shaped opening and come in different sizes.
The male studs are fitted first and then used to mark positions for the mating part.
May 10, 2012, 12:21 AM
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Ian Easton's Avatar
The engine is mounted now, just working on finalizing the cowl cut out shape. All that's left to do after that is cover it!
Last edited by Ian Easton; May 14, 2012 at 10:45 PM.
May 14, 2012, 10:50 PM
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Ian Easton's Avatar
What do you guys recommend for a fuel tank size? The engine has never been in a model before and the instruction manual says a 10oz tank will give about 10 minutes at full throttle. Well, considering I wont be barreling around the sky at full throttle I though 6oz might be adequate.
May 15, 2012, 04:45 PM
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Some more progress on the build. Here's the nose shaping completed.

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I had some trouble getting 3/32 balsa windscreen frame to bend round without cracking, even when wetted. So I decided to laminate the windscreen from 1/32 plywood and 1/16 balsa. Here's the 1/32 plywood layer:

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and here's the 1/16 balsa top layer. I've also fitted the side frames.

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Next step will be the cowling. I'll need to decide how to make this.
May 16, 2012, 05:26 AM
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sparks59's Avatar
Nice carpentry BB.

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