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Old Aug 18, 2013, 04:41 PM
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Surrey B.C. Canada
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Reinforcing Stick Fuselages

I've always been fascinated by old free flight models and decided to do a couple electric conversations. I bought a couple Pacific Ace kits from Bob Holman. The fuselage is your basic square box framed up from balsa sticks. I was wondering if they would need and sheet reinforcement inside the front portion where the battery and radio will go. I was thinking 1/32 sheet on the 36" Ace and 1/16 on the 50" Ace. Or do I just leave them as originally designed with stick construction. Any words of wisdom here.Thanks
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Last edited by David Pentland; Aug 18, 2013 at 04:42 PM. Reason: Spellin
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Old Aug 18, 2013, 04:51 PM
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Umkomaas, South Africa
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Normally around the nose section and to about 50% of the wing chord would be sheeted, I think it was to do with vibration when using an internal combustion engine, but if a battery needs to go into the nose it is a good idea to sheet it to help with strength and also to keep the battery wires etc. from poking holes in the covering.

Have a look at some old-timer plans of internal combustion models to get an idea of how they where sheeted, there are plenty in the plans thread here in the vintage/old-timer forum.

Lionel.
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Old Aug 18, 2013, 05:04 PM
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Yep....but vibration is not the only factor....
The inertia of a battery pack at a (hard) landing, is to be taken seriously, too....

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Old Aug 18, 2013, 05:25 PM
I like real wooden aeroplanes!
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Quote:
Originally Posted by David Pentland View Post
I've always been fascinated by old free flight models and decided to do a couple electric conversations. I bought a couple Pacific Ace kits from Bob Holman. The fuselage is your basic square box framed up from balsa sticks. I was wondering if they would need and sheet reinforcement inside the front portion where the battery and radio will go. I was thinking 1/32 sheet on the 36" Ace and 1/16 on the 50" Ace. Or do I just leave them as originally designed with stick construction. Any words of wisdom here.Thanks
On my rubber model to electric R/C conversions I tend to use a minimum of extra sheeting just around undercarriage mountings and right at the front. The battery issue is taken care of by installing an internal platform on which the battery is mounted with velcro, or a box.
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Old Aug 18, 2013, 07:55 PM
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Canada, ON, Caledonia
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Originally Posted by Sundancer View Post
On my rubber model to electric R/C conversions I tend to use a minimum of extra sheeting just around undercarriage mountings and right at the front. The battery issue is taken care of by installing an internal platform on which the battery is mounted with velcro, or a box.
Me too!

Bill
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Old Aug 18, 2013, 08:52 PM
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Surrey B.C. Canada
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Thanks Guys, I think I'll add a little sheeting tonight.
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Old Aug 18, 2013, 10:04 PM
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A neat little trick I stole from here was the use of paper gussets on the connections of the sticks. a little paper triangle on the T connections and a diamond on the + connections adds a lot of strength for little weight gain.
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Old Aug 19, 2013, 02:34 AM
I like real wooden aeroplanes!
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For example, like this:
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Old Aug 19, 2013, 07:49 PM
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Quote:
Originally Posted by Gluehand View Post
Yep....but vibration is not the only factor....
The inertia of a battery pack at a (hard) landing, is to be taken seriously, too....
I've adopted a practice I learned from a nearby club -- and that's to shape the front of the battery compartment as a ramp situated such that on impact the battery pack is directed down and out of the fuselage in stead of through the nose. Might save a lot of repair if the battery has much momentum at crash time.
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Old Aug 19, 2013, 10:00 PM
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I said I was working on a Pacific Ace, I meant Henry Struck's American Ace . The old gas free flight. Anyway I added some 1/32 sheet to the inside of the fuselage sides last night. Now I have to resand all my cross pieces to account for the smaller inside dimension.
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Old Aug 19, 2013, 10:04 PM
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Seems like a modern brushless and lipo power system and radio control has to weigh a lot less than an old engine with an ignition system! At least if you're not overpowering it.
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