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 on: Yesterday at 11:58:21 AM 
Started by bruce finley - Last post by Tim Wescott
Here's the story guys. on my inside Square after the second turn the plane takes off sailing away at a 45 angle. Outside squares no problem, sharp and crisp. what do you think?  Looking for warps or issues, not seeing anything. Could this be an issue with fixed lead outs and the CG?

If it doesn't do it on the outside squares, then look harder for warps or issues.  Look for warped wings, flaps not in alignment, and the tail twisted with respect to the wing.  If you don't find any such, look for the airplane rolling toward the inside or the outside -- basically, if it always flies with the same tip up or down then it's a tip weight issue; if it always rolls in the same direction (meaning, if it's tip up while upright and tip down while inverted) then the plane is rolling.  If the wings are dead flat, or always tip down, and it misbehaves on insides and not outsides, then chances are the elevator is tilted.

If it does have a problem with misbehaving more in one direction than the other then you can paper over that problem with more tip weight -- at the expense of hinging.  It's something to be done as a last resort, but you really want to find the root cause.

 on: Yesterday at 11:53:42 AM 
Started by REX1945 - Last post by Tim Wescott
And let us know how it comes out.  This is my current solution to training, but it's smaller than what you're doing (it's roughly 1/2-A sized, but a bit heavy at 8 ounces).  I think it could be scaled up, but then you may have to pay $2 to $5 for the airframe, instead of $1.

The key point of the design isn't that it's indestructible, but that the airframe is cheap and easy to assemble so you can show up at the field with a bunch of 'em.  It's electric because I think that's easier to deal with for a beginner, and the particular beginner I'm training doesn't like the noise.  It's a pusher because electric motors have smaller shafts than IC motors, and where you can bonk an 8-ounce IC plane nose-down on dirt and not break an engine, you'll bend a motor shaft every time unless it's not in the front of the plane.  I hope that I haven't just replaced burning batteries for bent motors -- we'll see once I get a chance to have a training session with it.

 on: Yesterday at 11:48:48 AM 
Started by REX1945 - Last post by Tim Wescott
Hey Rex:

Give it a try the way you picture it, and see.  I think your big problem isn't going to be going rich as it gets up to speed, but rather having it go lean as the flight progresses.  I'm not sure if that's even an issue with a trainer plane but -- give it a try.

If it goes rich when it gets up to speed, or leans out too much during the flight, make it a uniflow. 

The next bit only applies for the direction you're mounting your tank:

As long as there's no leaks all you have to do to make this happen is to run the uniflow vent all the way to the back of the tank -- that puts the uniflow vent on the outside of the circle, which is where you want it for uniflow nirvana.

 on: Yesterday at 11:43:43 AM 
Started by bill bischoff - Last post by bill bischoff
Thanks, Joe.


 on: Yesterday at 11:25:01 AM 
Started by bruce finley - Last post by Randy Ryan
That is when you start adding clay to the inboard wing so you know how much to remove when you open it up.

Ah good point Bob.

 on: Yesterday at 11:23:57 AM 
Started by Jim Roselle - Last post by Jim Roselle
Looks like the SuperTiger C35 with baffled piston is a legal engine. Do the .25's have to run the 9-6?

There seems to be a big disparity in planes with Busters against racing clowns.


All motors run the 9/6. Rules are being modified to specify plain bearing .25s. As far as plane disparity, contestants should choose their model wisely.


 on: Yesterday at 11:20:49 AM 
Started by bruce finley - Last post by Randy Cuberly
I've already added about three quarters of an ounce, seem to help. That's why I was asking about the total weight involved. Thanks to all who replied.

Three Quarters of an ounce is a lot of weight to have to add to a (ARF Nobler).  I strongly suspect that there is another issue.  Most probably (no garuntees) there is a warp either in the wing itself or a flap, or misalignment in the stab to flap hinge line.  It's just about impossible to trim an airplane from remote locations by typing on a keyboard but those are the things I would look for first.

One question...what engine and prop are you running and do you have any engine offset.

Paul Walker provided some time ago a trimming check sheet, you can probably find it on line or from Paul.  It's an excellent guide line for trim problems.

Randy Cuberly

 on: Yesterday at 10:48:23 AM 
Started by REX1945 - Last post by REX1945
Last fall I started teaching kids in the local B&G Club how
to build balsa models, apply for AMA membership, and have
fun with Flying Clowns and gliders.

This summer, we are near completion of the clowns and going
out to the flying field to learn how to fly. After a comment from
Saul Williams (AMA 1066653) that he didn't want to fly his plane
and crash it, I started looking for a "Trainer Plane" they could learn
on that would be easy to build, cheap, and somewhat crash-proof.

The Osborne platter was my first idea, but I really think it's easier
to learn with a .15 due to line tension issues.

I made a couple of foam wings and attached power module and control surface
and we've been crashing one a week for the last month.  The CG is a bit
too far forward and the chicken-hopper tank was vulnerable.

My second iteration was to make a longer chord profile (I used my Adams' Special templates).
This flies a bit slower and with dacron reinforcement is fairly indestructible.

Last week we KO'd the tank and I'm thinking of mounting a 1 Oz klunker sideways between
the motor and the BC.

Will a klunk work when mounted in this orientation, or will it go rich when we get up to speed ?

Looking for comments on the design and other options.

 on: Yesterday at 10:33:16 AM 
Started by RandySmith - Last post by RandySmith
Anyone who has any of the  MNT  handles on order  please let me know what you need, i have a shipment back in stock now, with a few  HK hard point clips packs  too

Randy    678 407 9376

 on: Yesterday at 10:31:06 AM 
Started by Leester - Last post by RandySmith
Randy- any updates on NVA for Fox 35? Thx Lyle Spiegel
Hi Lyle
not yet I have new  standard PA  NVAs  in stock  but not Fox ones


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