limited control movement - I'm confused. - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-26-2003, 05:36 PM   #1
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limited control movement - I'm confused.

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Need some advice from the glider pilots here.
My Sobox Max 1.5M glider is as follows.............

Type: Pod and boom V-tail, fully molded, electric powered, aerobatic glider with moderate thermal capability.
Wing: 59" inch span - chord at root 7 3/4 in. - area 410 sq. in - airfoil SD7084 - swept planform - dihedral tips - 2 servo, 53% span ailerons - no flaps.
Servos: 2 aileron - 2 Vtail
Power: Mega 16/15/5 direct drive - 7.08" x 3.15" folder prop - batteries 7 cell Kan NiHM 1050 and 9 cell Kan NiMH 1300.
AUW: with Kan 1050 = 24 oz. - with Kan 1300 = 27 oz.
Computer calculated predictions:

for Kan 1050 battery at full throttle ---- prop pitch speed = 39 mph
level flight speed = 16 mph
static thrust = 18 oz.
level flight thrust = 17 oz.
static amps = 13A

for Kan 1300 battery at full throttle ----- prop pitch speed = 47
level flight speed = 17 mph
static thrust = 27 oz.
level flight thrust = 25 oz.
static amps = 18A

My plan is to use the 1050 battery for getting thermaling altitudes.
And the 1300 battery for mild areobatics.
Later, I can add a gearbox and larger prop for even better prop efficency and resultant increased thrust.

OK - now that you've got a good idea of what I'm dealing with, here are the areas I need advice...............


Seems these fully molded craft don't usually come with any instructions at all and mine is no exception.
The ailerons are top hinged and will move up 90 degrees, but they only move down about 5 degrees.
The ruddervators are top hinged too and will move up 90 degrees, but only move down about 6 degrees.
It would seem that I could increase downward travel by removing material from either the trailing edge of
the wing or stab OR from the leading edge of the aileron or ruddervator.
I would like to use V-tail mixing and aileron mixing.
I want to use aileron mixing for spoilerons ( landing ) and some camber (chasing thermals).
I'll be looking to have some aileron differential dialed in as well as aileron/rudder mixing.

So here is where I'm confused ---

How will the elevator ever work for pitching the nose down if it only deflects down about 6 degrees?
How can the rudder work effectively if one of the ruddervators can only move 6 degrees?
I guess I can live with ailron down only 5 degrees since I'll have aileron/rudder mixing, and 5 degrees down
should be ok for camber setting, but if the rudder is not working effectively seems turning is gonna be a problem.
Anyways - that's just thoughts for thermaling use.
What about when there are no thermal s and I've got the big thrust battery in and I just wanna have some hotliner fun?
Are those limited downward control surface movements going to limit my arobatics possibilities?
And if I remove some material to get the downward movement, is there a way to deal with the big gap that is left, and
will that gap cause drag I don't need for thermalling?

Thanks for any advice on this matter.

I include some pics o the glider.

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Old 11-26-2003, 07:18 PM   #2
Jim D
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I am: Jim D
Join Date: Jan 2003
Location: Orangeville, Ontario

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Sobox Max 1.5

Have you contacted Zbigniew at Sobox. He was very helpful answering some questions I had regarding another of his products. I have another of his electric gliders and I find that elevator/rudder and ailerons require very minimal throws- not even as much as was recommended
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