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Old Mar 09, 2015, 06:31 AM
Bob Templeton
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USA, AL, Huntsville
Joined Apr 2007
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Quote:
Originally Posted by cray2602 View Post
So i was skimming through the thread to see what power setups others are using and came across this. Are you kiddin me? 385 watts pushes that bird 90mph? What am i missing here? I have tons of EDF jets and my only experience with a pusher prop was a Stryker delta wing. It ran about 275 watts and i would guess its speed about 60mph.
I was planning on using twin 2200kv motors but heck i may try this single setup.
It's been a long while, but 384W doesn't sound right. I'll see if I can find some of the old raw footage of speed passes and check again.
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Old Mar 10, 2015, 05:37 AM
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Joined Aug 2012
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Negra RC Su - 35 (5 min 48 sec)


At the weekend, I had the first flight ...
Disagree disappointment, everything worked perfectly :-9
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Old Mar 10, 2015, 06:18 AM
Bob Templeton
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USA, AL, Huntsville
Joined Apr 2007
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Well done negra! Congratulations on your successful maiden.

cray2602: I can't find the video of my high-speed passes, but I'll let you know when I come across them.
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Old Mar 10, 2015, 09:28 AM
Bob Templeton
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USA, AL, Huntsville
Joined Apr 2007
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Found it...

Su-37 Speed Runs (0 min 54 sec)
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Old Mar 10, 2015, 06:13 PM
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United States, CA, San Diego
Joined Aug 2010
257 Posts
Quote:
Originally Posted by cray2602 View Post
So i was skimming through the thread to see what power setups others are using and came across this. Are you kiddin me? 385 watts pushes that bird 90mph? What am i missing here? I have tons of EDF jets and my only experience with a pusher prop was a Stryker delta wing. It ran about 275 watts and i would guess its speed about 60mph.
I was planning on using twin 2200kv motors but heck i may try this single setup.
You can look at some of the stuff that I did based on Steve's designs. I did a 120% of the Su-37 for a twin 64mm 4S EDF with thrust vectoring. I also did an Su-27, Steve's design as well. This was twin 55mm 3S EDF. Then I did my own Mig 29 twin 70mm 4-5S EDF with TV. Both Su's push about 1000 watts and the Mig pushes almost 2000 watts.

http://www.rcgroups.com/forums/showthread.php?t=1502194
http://www.rcgroups.com/forums/showthread.php?t=1502180
MiG 29 Scratch Build (8 min 11 sec)


Vic
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Old Mar 10, 2015, 06:13 PM
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United States, CA, San Diego
Joined Aug 2010
257 Posts
Quote:
Originally Posted by cray2602 View Post
So i was skimming through the thread to see what power setups others are using and came across this. Are you kiddin me? 385 watts pushes that bird 90mph? What am i missing here? I have tons of EDF jets and my only experience with a pusher prop was a Stryker delta wing. It ran about 275 watts and i would guess its speed about 60mph.
I was planning on using twin 2200kv motors but heck i may try this single setup.
You can look at some of the stuff that I did based on Steve's designs. I did a 120% of the Su-37 for a twin 64mm 4S EDF with thrust vectoring. I also did a 100% Su-27, Steve's design as well. This was twin 55mm 3S EDF. Then I did my own Mig 29 twin 70mm 4-5S EDF with TV. Both Su's push about 1000 watts and the Mig pushes almost 2000 watts.

http://www.rcgroups.com/forums/showthread.php?t=1502194
http://www.rcgroups.com/forums/showthread.php?t=1502180
MiG 29 Scratch Build (8 min 11 sec)


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Old Mar 27, 2015, 10:51 AM
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France, Lower Normandy, Domfront
Joined Mar 2013
15 Posts
Hello,
I am trying to build a following SU37 excellent plan Steve Shumate.
I think replacing the rudder by a programming differential motors. ("taranis" open Tx). Feedback of?
Thank you to all and especially to Steve ....
Pictures soon ....
(google translation)
Jean C.
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Old Mar 27, 2015, 12:01 PM
Bob Templeton
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USA, AL, Huntsville
Joined Apr 2007
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Quote:
Originally Posted by AERO41 View Post
Hello,
I am trying to build a following SU37 excellent plan Steve Shumate.
I think replacing the rudder by a programming differential motors. ("taranis" open Tx). Feedback of?
Thank you to all and especially to Steve ....
Pictures soon ....
(google translation)
Jean C.
In my opinion, rudders aren't worth the trouble on this model. Ailerons are way more important than rudders. While I speak from my experience of building and flying two of these from scratch, it's still just my opinion and others may have different feelings. Check out my build posts:

Here: http://www.rcgroups.com/forums/showt...2#post10412272

and here: http://www.rcgroups.com/forums/showt...6#post18204868

I hope this helps....good luck with your build!
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Old Today, 12:56 AM
Park Jet Guru
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Seattle, WA
Joined Jun 2002
5,633 Posts
Quote:
Originally Posted by AERO41 View Post
Hello,
I am trying to build a following SU37 excellent plan Steve Shumate.
I think replacing the rudder by a programming differential motors. ("taranis" open Tx). Feedback of?
Thank you to all and especially to Steve ....
Pictures soon ....
(google translation)
Jean C.

Merci pour le compliment, Jean!

I put rudders on all my park jets, mostly because I like doing low speed high alpha manuevers. They also help some with smoothing out turns and for some aerobatics. But for normal sport flying, they are not necessary and are probably not worth the trouble.

That said, I found on my Su-37 that differential thrust is no substitute for rudders, since they are too difficult to control precisely. Differential thrust can product fun wild manuevers, but not precise yaw control.

Good luck!
Steve
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