Technical Links - Page 2 - RC Groups
Thread Tools
This thread is privately moderated by Stark Flyer, who may elect to delete unwanted replies.
Nov 11, 2005, 05:39 AM
Suspended Account
thanks jim.
Sign up now
to remove ads between posts
Nov 11, 2005, 12:43 PM
Registered User
Stark Flyer's Avatar
If it helps I fly that blue foamie of mine with a Park 370 5400kv motor, 10x8 prop, GWS "D" gearing with a 2S pack. At wot it justs barely goes verticle. Plane weighs 9.6oz without the 2S battery. If I recall correctly it draws around 10 - 11amps static at wot. Motor is a little warm to the touch. I put a 3S 2100 pack on ot once and it went ballistic. Motor was pretty hot.

Nov 12, 2005, 02:51 PM
Mayor of Simpleton
Tommy632's Avatar
Originally Posted by jmullane
I put the 370 4100 Kv in MotoCalc with a 9 x 6 prop and a 3s 1320 Lipo:

Batt Amps = 25.7
Motor Amps = 25.7
Motor Volts = 9.3
Input (W) = 239.7
Loss (W) = 206.3
MGbOut (W) = 33.5
MotGb Ef(%) = 14.0
Shaft Ef(%) = 11.7
Prop RPM = 5553
Thrust (oz) = 9.6
PSpd (mph) = 31.6
Prop Ef(%) = 0.0
Total Ef(%) = 0.0
Time (m:s) = 3:05

With a 12 x 6 prop.....

Batt Amps = 24.7
Motor Amps = 24.7
Motor Volts = 9.4
Input (W) = 232.4
Loss (W) = 214.7
MGbOut (W) = 17.7
MotGb Ef(%) = 7.6
Shaft Ef(%) = 6.5
Prop RPM = 3062
Thrust (oz) = 9.3
PSpd (mph) = 17.4
Prop Ef(%) = 0.0
Total Ef(%) = 0.0
Time (m:s) = 3:12
Those numbers seem odd. Did you include a gearbox in that??
Nov 12, 2005, 04:34 PM
Suspended Account
went to hobby town and traded in the park 400 (can) for the 370 out runner. we'll see if it works.
Nov 12, 2005, 10:07 PM
Something Clever
RktMan's Avatar

I attached a picture of the MotoCalc screen. This is how I received the numbers listed above.

Nov 12, 2005, 11:31 PM
Indoor Free Flight Modeler
you need to add a gearbox , the way you have it set up is as a direct drive, that is why the amps are so high.
Nov 13, 2005, 02:50 AM
Suspended Account
so what are you saying, don? this is the wrong motor for this plane (E-flite Park 370 Outrunner 1360kv)?
the plan calls for either a GWS EPS100-A or EPS300C-C and the AUW is around 12oz.
i plan on using a 2S lipo too.
Nov 13, 2005, 06:21 AM
Something Clever
RktMan's Avatar
MotoCalc with a Park 370 Outrunner 1360Kv / 9 x 6 Prop Direct Drive/ 2s Lipo

Batt Amps = 13.4
Motor Amps = 13.4
Motor Volts = 6.8
Input (W) = 90.5
Loss (W) = 28.5
MGbOut (W) = 62.0
MotGb Ef(%) = 68.5
Shaft Ef(%) = 62.7
Prop RPM = 6821
Thrust (oz) = 14.5
PSpd (mph) = 38.8
Nov 13, 2005, 09:13 AM
Suspended Account
thanks again jim. those numbers look good.
Nov 13, 2005, 09:49 AM
Indoor Free Flight Modeler
Originally Posted by sgtdirt
so what are you saying, don? this is the wrong motor for this plane (E-flite Park 370 Outrunner 1360kv)?
I am saying the motocalc simulation shown used a Park 370 inrunner with a KV of 4100 running a 9x6 direct drive prop. So you would need a gearbox added to it to lower the amps. Or the simulation changed from and inrunner to an outrunner , but then the KV would have to change from 4100 to 1360.
Dec 02, 2005, 12:22 AM
Suspended Account
besides don, who has done a Xtal exchange with radicalrc?
Dec 26, 2005, 01:15 AM
Suspended Account
has anyone ever used the Dean's 3 pin for the ESC to motor connection. i'm thinking about using these for a CDrom with a CC TB9 on a 2S lipo. i have bullet connectors on the motor now and this may be a weight issue.

got it done. yes it works. nice and light too. although it was running the wrong direction, i hooked it up to the PHX-link and made the change. running good now!!
Last edited by sgtdirt; Dec 26, 2005 at 10:00 PM.
Dec 28, 2005, 01:44 PM
Mayor of Simpleton
Tommy632's Avatar
Hey Jack, I just got some of these from Parma Hobby. There non-polarized.

Dec 28, 2005, 05:30 PM
Registered User
Carnifax's Avatar
I got some of those Deans micros for the ESC-Motor connection. They work well but you have to patient when soldering them.
Dec 28, 2005, 06:52 PM
Suspended Account
thanks tommy.
those would probably work since i am only (hopefully) going to draw less than 5 amps.

Thread Tools