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Old Sep 30, 2001, 12:12 AM
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graupner speed 600 8.4v race motor

Any one have info on suitabilty of using this DD on 8 cells for a Mirage 550?
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Old Sep 30, 2001, 08:00 AM
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is it the same ?

is it the speed 600 are equal with Traxxas "Stinger" motor ?

do you have the picture ?
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Old Sep 30, 2001, 12:12 PM
Destroyer of Cell's!!!
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matfield,tonbridge, kent,england
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here's the stats for the GRAUPNER SPEED600 8.4v RACE ;
NOMINAL VOLTAGE 8.4v.......................OPERATING RANGE 4.8--9.6v ................NO LOAD SPEED 21000rpm..............CURRENT DRAIN AT MAX EFFICIENCY 12amps..................MAX EFFICIENCY WITHOUT GEARBOX 76%..........SHAFT DIAMETER 3.17mm .............WIEGHT APPROX 195g....................I have just fitted one to a mustang running on 8cells and a 2.3:1 gearbox should give me around 9mins of flat out flight
regards
nasa_steve
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Old Jan 08, 2002, 05:07 PM
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graupner race speed 600 on 8 cells

Quote:
Originally posted by nasa_steve
here's the stats for the GRAUPNER SPEED600 8.4v RACE ;
NOMINAL VOLTAGE 8.4v.......................OPERATING RANGE 4.8--9.6v ................NO LOAD SPEED 21000rpm..............CURRENT DRAIN AT MAX EFFICIENCY 12amps..................MAX EFFICIENCY WITHOUT GEARBOX 76%..........SHAFT DIAMETER 3.17mm .............WIEGHT APPROX 195g....................I have just fitted one to a mustang running on 8cells and a 2.3:1 gearbox should give me around 9mins of flat out flight
regards
nasa_steve
\

What prop size worked best ? ( i know it's been a long time since my last post , sorry I somehow missed your reply steve.
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Old Jan 08, 2002, 11:59 PM
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53859 Niederkassel, Germany
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Too hot for direct drive in a Mirage 550. Why don`t you use a cheap Speed 600 7.2V ECO? Jürgen
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Old Jan 09, 2002, 03:00 AM
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Hastings, Hawkes Bay, New Zealand (Aotearoa)
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The specs for this motor in Motocalc appear to be incorrect. I have remeasured them and compared them to actual measured results with far better accuracy.

The revised constants are:

rpm/v = 2210
Idle Current = 2.4A
Resistance = 0.06 ohm

This makes it very similar to a Magnetic Mayhem so would be better geared for the Mirage 550, would be Ok direct on a faster plane like the Electrostreak. Somewhere around 2.3:1 and a 10x7 - 11x7 prop would be fairly good.

Heather
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Old Jan 09, 2002, 07:03 AM
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My rule of thumb has always been :
Race = higher rpm's per volt = more suited for geared applications

The problem with DD is that you have to go to smaller props than a regular wind. This means less effective performance in the model.

About the best application for the Speed Race 600 8.4v is :
10 cells / 9x5 prop / 2.33:1 gearing = 165W at the prop.
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Old Jan 09, 2002, 01:56 PM
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matfield,tonbridge, kent,england
Joined May 2001
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hello
best compromise was a 10*7 apc-e prop on the mustang .

my this thread was a long time ago i had to look way back in my records to find out what you were refering too many things have changed since i wrote the original reply..........the motocalc came up with the 10*7 prop but you really need to use this with your planes details as well as it might come up with something different dependant on the planes stats ei.wing area weight etc...it will run fine on 8 cells personnally i think 10 is a bit of overkill and the whole idea is to keep the weight down there's quite a weight difference between 8 and 10 cells and of course theres the size of the pack to think of as well is the model physically big enough to accomodate more than 8 cells......anyway hope i've been of some help

regards
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Old Jan 09, 2002, 02:46 PM
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Forli, Italy
Joined Dec 2001
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Hi, I've only a little experience with 600 class in aircraft, and much more with boats.
I can suggest u the cheaper 600 ECO. The race version need a lot of power.
The 600 RACE BB I've now on my boat, has been modified for liquid cooling (brushes cooled too) and it sucks 40+ Amp with 16 cells (8+8 in parallel). It reacts very well. Only if yuor plane need a lot of power u can consider it (cheaper than brushless).

Bye,
- Anfarol
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Old Jan 09, 2002, 03:43 PM
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some more infos on this motor

http://www.rc-segelmodell.de/elektro...nspeed600.html


i use direct setup with exactly!! the same folder on my 54inch trainer model weight:1600gramms(56,5oz)

http://www.misi-online.de/html/elektroflux.html

it gives enough power to fly nice loops after picking up little speed on horizontal flying! (and this trainer isnt that aerodynamic as a mirage)

flight time as expected 5min at full throttle with 7xrc2000(normally about 6 to 6.30minutes)...this data are prooven by my own tests

also have video of my trainer

http://www.misi-online.de/elektroflux1.avi (2,8mb)

http://www.misi-online.de/elektroflux4.avi (5mb)



hope you like it


micha
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Last edited by misi; Jan 09, 2002 at 03:50 PM.
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Old Jan 09, 2002, 03:52 PM
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oh sorry

didnt see the "race"

my statement was for the "normal" speed 600 8,4V

but maybe thats something for you??
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Old Jan 09, 2002, 08:02 PM
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Thanks Heather, the motor's tach and ammeter readeings were no where close to Motocalcs report. Weather permitting I hoe to fly tomorrow with a perkins 2.65:1 GB on 8 cells. Aryeh
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Old Jan 09, 2002, 08:11 PM
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Thanks Heather and the rest of you kind people, the motor's tach and ammeter readings were nowhere close to Motocalcs predictions. The reason I'm using a "race" motor is that was what was handiest. Weather permitting I hope to fly tomorrow with a Perkins 2.65:1 GB on 8 cells. Will start with a 10x8 prop and let you know what happens. Aryeh
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