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Old Nov 03, 2010, 05:47 PM
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Gold Coast Australia.
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My guess is the fuselage lower longeron that has a fair bend in it up front is trying to straighten the fuselage.
That lower longeron needs to be steamed to shape first or better still laminate it from 2 X 3/16x3/32 strips then put into place before the glue sets.
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Old Nov 06, 2010, 04:01 AM
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Manitowoc, Wisconsin
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I agree, in fact, it wouldn't hurt to laminate upper and lower longeron.
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Old Nov 06, 2010, 07:30 AM
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Newport News, Va
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I am currently building what I am calling Sorta Boy, my tribute to Vic Smeed. It's very much like the Tom Boy but the nose has been extended to accept a 1200 ma 3 cell LiPo and the wing and stabilizer use an I-Beam spar. I used fairly hard 3/16" square framing for the fuselage and the bottom curvature is just like the Tom Boy. It's wasn't easy to force the bottom to take the curvature just behind the firewall.

What I did while the constructed side frames were still 'pinned' to the building board, I misted the entire side frames with water using an atomizer and then let them set overnight before releasing. They released without any distortion! Again the 3/16" square was at least 10 lb balsa. Just think what you could achieve if balsa selected was less then 10 lb density.

Gene
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Old Nov 07, 2010, 09:08 AM
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South Africa
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Good ideas - this is the best part of a build thread, all the new things you learn! Thanks for the input guys. Not much done due to ther comitments, landing gear bent and motor mount made
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Old Nov 08, 2010, 03:03 PM
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South Africa
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I decided the Tomboy would like good with wheel pants, and I thought an egg would make the perfect mold. So I lubed up an egg, pulled a pair of my better half's stockings over it and applied two layers of epoxy. Unforytunately, instead of a nice hard thin light shell I ended up with a thick heavy rather disgusting thing that looked like a fake nose Oh well, you live and learn. Anyway, no wheel pants for the Tomboy, but I did have ham and eggs for supper.

The front end is pretty much done now, it just needs glueing.
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Old Nov 09, 2010, 11:39 AM
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South Africa
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Nose

Nose glued and motor in place with a little down and right thrust. From looking at other old timer threads, more side and down thrust will be needed, but I'll do this with washers under the motor mount screws. There is plenty of space for the battery directly behind the motor or further aft - I'll check other tomboy threads and see where everything went on other peoples planes. For the moment I'm holding off as I've dug up an 800mah 2 cell tha I would like to use, but I first want to see if its still alive.
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Old Nov 09, 2010, 03:01 PM
Scott R/C Time Pilot
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NorthBend/Coos Bay,Oregon USA
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Go man go

Scott
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Old Nov 10, 2010, 01:03 PM
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South Africa
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Not much done tonight - But I think I got the shape close to correct. I've also used 3mm instead of 3/16 (4.76mm) balsa, mostly because I don't have much 4mm, but also because 3mm is plenty strong enough I think.
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Old Nov 10, 2010, 02:39 PM
Scott R/C Time Pilot
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NorthBend/Coos Bay,Oregon USA
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Looking good Owl, I think your building skills have improved.

Scott
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Old Nov 10, 2010, 06:15 PM
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Auckland New Zealand
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Try to keep the tail of your Tb as light as you can.Saves adding weight to the nose later. Looking good.
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Old Nov 11, 2010, 10:31 AM
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South Africa
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Thanks guys. Stab ready to assemble, but its weekend tomorrow, so building goes on hold in favour of flying.

Good weather and smooth landings to everyone
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Old Nov 13, 2010, 06:44 AM
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Progress
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Old Nov 13, 2010, 11:44 AM
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South Africa
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Stab and elevator done, mainspars cut, ribs cut. I think thats enough for one day. The rounded tips on the wing and elevator I will add later, and the only mod is that I'm probably going to add one more rib bay each side.
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Old Nov 14, 2010, 09:30 AM
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South Africa
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Its still raining here, so we got wings and undercarraige and saddle for stab.

A mate of mine often talks about doing a "longest flight" thing at the club. The way it works is that you have to ROG, then fly for ages, then land with the engine running and taxi (we're talking i.c.) . I'm thinking a Tomboy or something similar could do the job for electric? Or maybe a modified (u/c needed) bigger sinbad . . .
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Last edited by owlsabie; Nov 14, 2010 at 10:56 AM.
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Old Nov 15, 2010, 11:55 AM
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South Africa
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Help please!

Please help!

The wings are trimmed and temporarily joined by the dihedral brace, and at the angle set by the dihedral brace. The angle seems identical to that on the plans. Before I enthusiastically start glueing does this look OK? I definately want this more stable than my Sinbad!

p.s. what is a "dutch roll"?

Owl
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