How fast 400motor can go????? - RC Groups
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Sep 09, 2003, 12:50 AM
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jason_ices's Avatar

How fast 400motor can go?????

did any body know how fast cheap 400 can motor can go..... what kind of plane and setup their using??? Want to try a high speed plane with low $$$
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Sep 09, 2003, 01:11 AM
soholingo's Avatar
pylon racer w/ Rocket speed 400 motor.
Sep 09, 2003, 02:28 AM
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davidfee's Avatar
The fastest S400 model I have seen or flown is a Sobakin Stinger 400. It's a fully molded composite ARF, so it's not cheap. If you want low $$$, build yourself a small model like it. You can see a 3-view drawing at .

have fun,
Sep 09, 2003, 04:00 AM
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WimH's Avatar
Originally posted by davidfee
The fastest S400 model I have seen or flown is a Sobakin Stinger 400.
This is the model that wins most, if not all, pylon 400 races in Belgium. Fastest times around 80s for 10 laps. As the course is 100+100+20= 220m long, the "minimal" average speed thus calculates to ((220m*10)*3600)/(80*1000) or 99KpH. Straight line speed must therefore be way over 100Kph. This is with 7 cells and a 6V SP400 type motor. With 8 cells you can get it a bit faster still...
Sep 09, 2003, 07:47 PM
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jason_ices's Avatar
what kind of motor is that 6V SP400? any one have pic of Sobakin Stinger 400?
Sep 09, 2003, 08:26 PM
Size Matters!
RocketRob's Avatar
If you do a search on Stinger you should find photos or I think there are several in this thread
Sep 09, 2003, 08:58 PM
rroback's Avatar
for a little cheaper you can go with a switchblade from cavasos. I used that as my first fast plane, I had it running a 6v speed 400 ( went through 4 differernt ones) spinning a 5x5 or a 4.7 x4 or 4.7 x 4.7 on 8 or 9 cells. 9 cells was a little faster but wasn't really worth it. the fibers in the glass wing were splitting becuase of the forces i put it through. 3/4 throttle climbs and then full throttle steep dives and quick/lows pullouts worked it hard.

Sep 11, 2003, 12:39 AM
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jason_ices's Avatar
last night do some modification to my gws 400 motor, i retimed it and turn CCW. Amps reading was 12 amp with 4.6 X 4.5 prop (modify), 8 GP 1500mah nimh cells and 30A speed controller. what do u guy think it's good or bad ? If bad how do i improve the peformance?
Sep 11, 2003, 12:53 AM
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Peter Khor's Avatar
You can get a couple more rpm off a GWS 400 by removing the flux ring, which is standard iirc.
Sep 11, 2003, 02:08 AM
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The fastest setup I have ever flown or heard of was the 4.8V motor on 6 cells and a 4.5-4.1 Well over 100mph in any 400 racer you have. Prior to that, the Rocket was the hot ticket. Neither of these last very long. You'll get 2 flights out of the 4.8V motor and 3-4 good flights out of a Rocket. All this is assuming you do a race prep on the motors, but doesn't include comm drops.

Sep 11, 2003, 02:41 AM
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jason_ices's Avatar
what is flux ring?? where does it local?
Sep 11, 2003, 02:56 AM
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Peter Khor's Avatar
If this is the Speed 400 motor you got from GWS ... notice around the outside of the motor case there is a metal band? it's just clipped on and can be taken out easy. What flux rings are for, do a search on rcgroups ... basically lower amp draw of the motor, and rpm at the same time, increase efficiency.
Sep 11, 2003, 11:27 AM
Registered User
In my travels to make the 'bestest' Sp400 pylon motor, I found the flux ring to have as much effect on the motors as two empty boxes of Kleenex. I haven't seen any amp draw reduction on the bench, something I was hoping would make the motors last longer.

Sep 11, 2003, 03:15 PM
I plant balsa sticks too
luc's Avatar
2 flights with a 4.8V...gasp!!!
even as cheap as it is, going brushless will soon be the choice.
Personally, due to the cheap brushless and esc around, I only have megas. What a great motor! last setup is over 350W..
Sep 11, 2003, 03:40 PM
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The Other Dave's Avatar
w/ a flux ring the motor will produce less RPM if everything else
stays the same (prop, cells, gearing).

But it will be more efficient and draw less current.

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