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Old Oct 31, 2010, 01:18 PM
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Yet Another Tomboy - third rebuild

There are many Tomboy threads, but here's another.

This decision came about when the battery came loose in one of my favourite planes yesterday, causing it to dive and turn left. Full aileron and elevator was saving the day until an oak tree intervened.

I wanted a high wing parkflyer with reasonable ground clearance and simple construction. A good glide would be a bonus (but then it seems all vintage planes glide well, and most thermal?) It also had to be tough.

So far the two fuse sides are built and are drying.

Owl
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Old Oct 31, 2010, 05:33 PM
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Great choice it will probably be my next build also as I already have a Mills .75. What will you power it with?

Colin.
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Old Oct 31, 2010, 05:49 PM
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Mine will be electric. It kinda depends on what comes to hand first. It may be a no name brand motor that I'm fond of, as long as I haven't cooked it, or a small AXI 2208 silverline series motor. I also have a scorpion motor in a retired 3D bipe, but I think that would be a little too much, and a waste of a good motor. I'll probably go with the smallest motor I have lying around as I think this plane will do better with less power.

The build, although I intend to keep it as light as possible, may come out a little porky as I am planning to fly this baby for a long long time, and it needs a little bounce resistance.

I'll post some photos when the fuse is more or less done
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Old Nov 01, 2010, 12:08 AM
Scott R/C Time Pilot
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Good choice Owl. Keep in mind: don't build to crash, build to fly. A lighter airplane will fly better, crash less and when it does crash, will do less damage.
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Old Nov 01, 2010, 02:32 AM
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Are you going to fly at night Owl?
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Old Nov 01, 2010, 11:22 AM
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Fly at night? Don't joke - I've been thinking about a light kit, what else do you do with 6 channels and you're only using 3? I'm not thinking of building to survive crashes - I'm really good at that and can destroy anything But certainly solid enough to survive riding in the back of an old car on dirt roads! Suppers on, so I'll see how far I get with the fuse and maybe pop in a photo or two later .

An unexpected bonus with RET planes - the wings come off so easily they are much easier to transport

Owl
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Old Nov 01, 2010, 01:36 PM
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photos

Here we go - some pics. something is not straight, so I'll leave it for tonight and have a look again tomorrow, then I'll finish the fuse
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Old Nov 01, 2010, 04:00 PM
Scott R/C Time Pilot
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Looking great there Al, you are on the way now


Scott
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Old Nov 02, 2010, 01:45 PM
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A little disappointing

Its a little disapointing - some of the vertical fuse members are a little out (a millimeter here or there) which is why everything wouldn't line up. It doesn't sound like much, but its very obvious to the naked eye. Fortunately the front lines up well, as does the tail so I'll get the basic box and tail right, and then glue the rest. I guess it won't really show later.

Scott - I was looking at your thread, but I'm confused about the elevator. Did you build the stab per plan with aerofoil shape, and then add the elevator as a flat piece on the back, or did you build the stab flat, and just incorperate the elevator in the existing stab?
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Old Nov 02, 2010, 03:40 PM
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Top done. It still doesn't look straight to me, but for the life of me I can't find where. The front and the back at least line up
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Old Nov 02, 2010, 04:54 PM
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Quote:
Originally Posted by owlsabie View Post
Top done. It still doesn't look straight to me, but for the life of me I can't find where. The front and the back at least line up
...................
You could pull a cotton thread from the centre of the front bulkhead to the centre of the tail,Then measure the distance ether side.

Colin.
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Old Nov 02, 2010, 05:36 PM
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Thats a good idea, I'll give it a try.
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Old Nov 02, 2010, 06:08 PM
Scott R/C Time Pilot
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[QUOTE=owlsabie;16446881]Its a little disapointing - some of the vertical fuse members are a little out (a millimeter here or there) which is why everything wouldn't line up. It doesn't sound like much, but its very obvious to the naked eye. Fortunately the front lines up well, as does the tail so I'll get the basic box and tail right, and then glue the rest. I guess it won't really show later.

Scott - I was looking at your thread, but I'm confused about the elevator. Did you build the stab per plan with aerofoil shape, and then add the elevator as a flat piece on the back, or did you build the stab flat, and just incorporate the elevator in the existing stab?[/QUOTE

Hi Al.

I used the r/c plan on the tail like it said to do. I built the air-foiled stabilizer, ribs and all, and sanded the elevator to a trailing edge shape. The plane needs the lifting tail, all of the wing to tail angles are designed into the plane and needs the lifting tail.

I think you are doing a good job. One thing you might change is a different glue, epoxy is strong and fast, but very heavy. Yellow wood glue, solvent based glues like Ambroid, Ducco model type glues and medium Cya (if used sparingly) are light weight glues

All in all your Tomboy is looking really fine

Scott
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Old Nov 03, 2010, 12:36 PM
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Don't worry Scott - its not all epoxy, just some areas. Although I've come to love quickset epoxy - its cheap and very versatile. But heavy. I found my gremlin, and ist only partially fixable. The one side has bent dirrferently to the other. Normally when I cut long thin bits, I number them and mark the ends so that I use bits that were next to each other in the sheet of balsa, but as I only cut five for this one I didn't bother. The result is that I think the port top stringer is a little harder than the starboard one. I've adjusted the cross pieces, but there is still a bit of a wave there. Its not a biggie, as the overall alignment is good, and its probably only me that will notice anyway . . . but its annoying!

Thanks for the tail info, I went and printed the wrong plan in my enthusiasm!
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Old Nov 03, 2010, 04:17 PM
Scott R/C Time Pilot
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I built from the plans you used, but I looked at the r/c plan to modify the tail.
Don't worry, my fuselage is crooked too

Scott
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