What prop fo this combo? (razor 400 etc)

dpoles · Dec 01, 2003, 08:05 PM

My Switchback
3 cell etech 1200's
GWS C GB
Razor 400.

APC SF 10x7?

I am just switching to the Lipolys and want advice lest I fry some expensive batteries, what amps am I shooting for and how shall I prop it? (i prefer apc sf)

thanks
David

Earthbound · Dec 02, 2003, 01:17 AM

6A max for continuous use.

Stevens AeroModel · Dec 02, 2003, 11:04 AM

The factory is comfortable with suggesting a maximum continuous draw of 7.5c from these cells... That would be 9A for the 1200's I have pushed them harder then that for short bursts up to 12A ~10sec.... That RZ-400 will be happiest ~ 10A peak power... you could prop for 10A and just use a little caution with the left stick - You won't be lacking for power so that shouldn't be an issue.

-Bill

dpoles · Dec 02, 2003, 11:26 AM

OK, if i want to prop for 9 amps, what prop?

Tres Wright · Dec 02, 2003, 02:23 PM

David,

I posted Whattmeter/ thrust results for various props on a RZ-400/ C box/ 3x1200's here:

http://www.rcgroups.com/forums/showt...hreadid=135155

dpoles · Dec 02, 2003, 02:34 PM

woo hoo, EXACTLY what I needed. thank you very much!

Tres Wright · Dec 02, 2003, 03:04 PM

No problem David! I'd probably go with the 9x7 or 10x4.7. The 10x8 is pushing the cells at WOT, but it's possible you wouldn't need WOT much so it might work too. I'd start with the other props initially and see how it goes though.

Those are static thrust numbers, so the higher pitch props (9x7 and 10x8) were likely stalled and would generate more thrust in the air.

Good luck!

Dec 01, 2003, 08:05 PM	#1
dpoles Crash and Build Join Date: Oct 2001 Location: Morgantown, WV Posts: 1,733	What prop fo this combo? (razor 400 etc) My Switchback 3 cell etech 1200's GWS C GB Razor 400. APC SF 10x7? I am just switching to the Lipolys and want advice lest I fry some expensive batteries, what amps am I shooting for and how shall I prop it? (i prefer apc sf) thanks David

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Dec 02, 2003, 01:17 AM	#2
Earthbound Gravity brings me down Join Date: Sep 2003 Location: Seattle, WA Posts: 1,203	6A max for continuous use.

Dec 02, 2003, 11:04 AM	#3
Stevens AeroModel TrussLocMonkey Join Date: Feb 2002 Location: Colorado Springs, CO Posts: 3,910	The factory is comfortable with suggesting a maximum continuous draw of 7.5c from these cells... That would be 9A for the 1200's I have pushed them harder then that for short bursts up to 12A ~10sec.... That RZ-400 will be happiest ~ 10A peak power... you could prop for 10A and just use a little caution with the left stick - You won't be lacking for power so that shouldn't be an issue. -Bill

Dec 02, 2003, 11:26 AM	#4
dpoles Crash and Build Join Date: Oct 2001 Location: Morgantown, WV Posts: 1,733	OK, if i want to prop for 9 amps, what prop?

Dec 02, 2003, 02:23 PM	#5
Tres Wright Live to ride... and fly! Join Date: Mar 2002 Location: Forney, TX Posts: 13,068	David, I posted Whattmeter/ thrust results for various props on a RZ-400/ C box/ 3x1200's here: http://www.rcgroups.com/forums/showt...hreadid=135155

Dec 02, 2003, 02:34 PM	#6
dpoles Crash and Build Join Date: Oct 2001 Location: Morgantown, WV Posts: 1,733	woo hoo, EXACTLY what I needed. thank you very much!

Dec 02, 2003, 03:04 PM	#7
Tres Wright Live to ride... and fly! Join Date: Mar 2002 Location: Forney, TX Posts: 13,068	No problem David! I'd probably go with the 9x7 or 10x4.7. The 10x8 is pushing the cells at WOT, but it's possible you wouldn't need WOT much so it might work too. I'd start with the other props initially and see how it goes though. Those are static thrust numbers, so the higher pitch props (9x7 and 10x8) were likely stalled and would generate more thrust in the air. Good luck!