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Sep 25, 2012, 08:03 AM
Registered User
Discussion

Crow brakes


Hi don't know if this is the place to post but I need help to set up crow on an electric glider so the throttle stick is the crow the glider has two aileron servos and one on the flap. I have a dx7 transmitter need help ASAP thanks in advance
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Sep 25, 2012, 08:15 AM
LSF303-AMA Fellow
tkallev's Avatar
Don't think a DX7 has the programming guts to do this ... sorry
Sep 25, 2012, 09:55 AM
Registered User
Evan D's Avatar
Yeah the DX-7 has no sailplane programing though you can sorta get there using all the mixes but it'll be on a switch and not variable.
Sep 25, 2012, 10:13 AM
Registered User
Thank you can any one give me some hints of how to do it Iv never had a glider like this thank you
Sep 25, 2012, 10:50 AM
DS will change your life
SpeedsterDEN's Avatar
I need more info to help.
What are your intention ? and in what way are you think that it should work.

Im thinking the thottle are controling the motor.

How many ch on the rx ?
How many Mix have you already used ?

I have DX7 and 8 with crow mix on my gliders, no problem that there is no glider program, I mix it myself.
Sep 25, 2012, 11:05 AM
DS will change your life
SpeedsterDEN's Avatar
Hi DX7 and DX8 glider pilots

If you have problems to set the DX7 and 8 up for 4 servo wing gliders.
If you only 1 servo or y cable for flap, its more easy,

I use this on my Vector lll and the F3J Trinitus glider on the DX7
and the Flyfly FOX on the DX8
Works great.

6 ch Reciver

The flaps funktion are on the thottle stick.
When you use the elevator, the flaps is also mooving
(elev up/ down flaps. snapflaps)
When you use the flaps, the elevator compensate. (for elevator trim)
When you use the ailerons, the flaps are also mooving as aileron.(all wing aileron)
Spoilers (up aileron), are on the flt mode switch, So full crow brake are possible, if full flaps dont give enough braking.

My set up is:
wing setup is flapperons.
Aileron servos are in Aile and Aux

Flaps servos are in thro and gear.

The % in the mixing, are the settings Im using in my Vector lll, (DX7), and may not be the perfekt setup you have to use in your glider, but it will be very close.
Max throw/ reversing/ subtrim etc, will change the % and +/ - set up

Mix 1
thro/gear +58% +88% This make the gear flap go with the thro flap.
(in the mix you have to offset the gear +125%)

Mix 2
aile/gear +23 +19 offset +11 This make the gear flap go as aileron

Mix 3
Aile/thro -18 -25 This make thro flap go as aileron.

Mix 4
Elev/thro +36 +24 This make the flaps go as Snapflaps

Mix 5
Elev/gear +36 +33 This make the flaps go as Snapflaps

Mix 6
Thro/elev 0 - 36 This give the elevator a bit down, when using the flaps.

Spoilers,
Are in the FLAP system MIX
Norm UP100% DH44% Spoilers Aileron up with elevator trim
land 0 0
Land 25% 0% (Little down aileron for termal flying) use it with a bit flaps

And if you also want the ailerons go as snapflaps, you can mix it in the Elev/flap MIX

And when using a 6 ch rx, the towing coupling are on a y lead together with the thro (OR GEAR, if it goes the wrong direction), so when giving full flaps I release the tow.

----------------------------------------------------------------------------
And Pewhit explains in another tread:
Very interesting and well done.

For the DX7 and a six channel receiver, this mix achieves all of the above plus full wing camber/reflex - ie ailerons moving with flaps.

Spektrum DX7 Program For Four Servo Wing

Gives flaps linked to ailerons for increased roll rate, ailerons linked to flaps for full wing camber, and crow braking (using the throttle stick) with elevator compensation.

This program is based upon setting the ailerons as flaperons
The instuctions are for a 6 channel receiver.
If using a 7 channel receiver you can substitute Aux2 for GEAR which then leaves the GEAR channel free.

Please note that the programmable mix numbers used MUST be exactly as stated, as 5 and 6 give a different effect to 1,2,3, and 4

Ailerons
Enable flaperon mixing
Right aileron to AIL channel
Left aileron to AUX1 channel

Flaps
Disable gear switch by setting gear servo travel to 0%,0%
Right flap to GEAR channel
Left flap to THROTTLE channel
Set up PMIX5 as THROTTLE master to GEAR slave with setting of 100%,100%
This links both flaps together.

Crow braking

PMIX1 throttle master to elevator slave for crow braking elevator down compensation.
Rates are top 0%, bottom – whatever you need for your required down elevator compensation.
Offset value +100%. This sets the “mid point” of the throttle to stick full up and crow is activated by pulling the throttle stick down.

PMIX2 throttle master to flap slave. As the ailerons are set up as flaperons, the flap channel controls the ailerons as flaps. This gives both ailerons up movement for crow braking.

The throttle stick drives the left flap directly and as the flaps are linked by PMIX5, both flaps will move when the throttle stick is moved.

Full wing camber
The ailerons are set up as flapperons – use the flap system setting for the correct amount of camber and reflex, operated by the 3 postion flap switch.
Set the aileron travel first.
PMIX3 flap master to throttle slave this is the flap movement for camber and reflex.
As the flaps are linked by PMIX5, both of them will move.

Flaps moving with ailerons
PMIX4 aileron master to gear slave – moves right flap with ailerons.
PMIX6 aileron master to throttle slave – moves left flap with ailerons.

-----------------------------------------------------------------

Dont know if this help, then you have to give the info i asked for in post over this,

Regards
S
Sep 25, 2012, 04:41 PM
Registered User
Thanks for the help I think Iv got it but it now half ten at night and Iv got to be up at 5 for work will try it out when I get home tomorrow and post what Iv set thanks
Sep 25, 2012, 08:52 PM
Jackass of many Trades
MichaUT's Avatar
Dodgeson Designs did it mechanically, with something he called AFARTS.
No i dont know what the acronym means. It was used in the Windsong series of gliders. Some one here is bound to know more about how it worked, but i think there is a yahoo group dedicated to the Windsong.
Last edited by MichaUT; Sep 27, 2012 at 08:40 PM.
Sep 25, 2012, 09:26 PM
Panda Panda Panda Panda Panda
rdwoebke's Avatar
Quote:
Originally Posted by tkallev
Don't think a DX7 has the programming guts to do this ... sorry
Actually that isn't true. You have to be creative with the free mixes.

Ryan
Sep 26, 2012, 08:44 AM
Registered User
AFART= Automatic Flap-Aileron Reflex Trim.
Sep 26, 2012, 09:36 AM
DS will change your life
SpeedsterDEN's Avatar
My set up on the dx 8 with no Glider program

DX8. 4 flap wing Glider setup. (6 min 27 sec)


The DX 7 can do almost the same even on a 6 ch rx.


The thing that there are different then is:
Wing set up as flapperons, and the crow funktion (aileron up,will be at the flight mode switch) but it works great, in case that normal flaps isnt enough.

Regards
S
Sep 26, 2012, 12:38 PM
Proud member of LISF and ESL
Horizon Hobby has full house e-glider set-up templates for DX6i, 7 and 8.
http://www.horizonhobby.com/products...pnp-PKZ5475#t6
Sep 26, 2012, 08:32 PM
IT'S NOSE HEAVY!!!!
cityevader's Avatar
Quote:
Originally Posted by SpeedsterDEN
Hi DX7 and DX8 glider pilots

If you have problems to set the DX7 and 8 up for 4 servo wing gliders.
If you only 1 servo or y cable for flap, its more easy,
Forgive me if i misread this, but later in the post you mentioned flaps working as ailerons, which clearly can't happen with one servo or y-harness. But to be fair,
I also didn't thoroughly read the rest of it since Dx.. radios no longer apply to me.
Sep 26, 2012, 09:23 PM
Registered User
Evan D's Avatar
Actually it is true. Aint gonna happen on the throttle with variable crow...


Quote:
Originally Posted by rdwoebke
Actually that isn't true. You have to be creative with the free mixes.

Ryan
Sep 26, 2012, 09:26 PM
Panda Panda Panda Panda Panda
rdwoebke's Avatar
Quote:
Originally Posted by Evan D
Actually it is true. Aint gonna happen on the throttle with variable crow...
Sure it can be done. You have to get creative with mixes. You also can't have every feature you might want but if crow is on your list then that's something that you can setup.

Ryan


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