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View Full Version : Swift headspeed at 2700 with woodies!

gaeric
10-12-2006, 04:20 PM
After my initial post, where I thought I was at 2270 I took the blades off my Swift and put it at max speed. Reading from the paddles I'm getting 2700 RPM. I just got this bird used and I'm using the setup that came with it. I did take the Carbons off and went to woodies since I expect a crash, being a newb and all.

So, is my gauge reading correctly? Can a Tango 45-10 w/ 11 tooth, CC-80 and TanicPack 6S 3650mah pull 2700 rpm. No way will I get it down to 1800 with curves alone. Also, I still only have the 3mm blade bolts, haven't bent at 2700 w/ woodies, and can't go to 4mm since the Carbons that came with the bird are drilled for 3mm.

So, do I put the carbons back on and leave it at 2700, or do I go a smaller pinion (which size, where to buy)?

Thanks,
-Eric
Finless
10-12-2006, 09:37 PM
With no blades on it there is no load so the RPM will be MUCH higher than with blades on and under load in the hover!!!!! You cant measure RPM like that.

Bob
gaeric
10-12-2006, 10:23 PM
Oh, so how do I measure with my tach that I'm supposed to hold over the blades? Guess I weight the bird down so it doesn't take flight under full throttle.

-ERic
Finless
10-12-2006, 10:36 PM
Most people use a real heli tach like Skytach. You hover the heli and have someone else use the tach and get your head speed. It is a stand off look through device so no one is close to the spinning rotor.

Some folks have used the point at the blades type but on a heli this size that is real scary and somewhat damngerous so please be careful!

Anyway you will need to have about -6 pitch to simulate the loads you would have at hover with +6 pitch. The you can point the tach down on the head being careful not to also read the flybar.

AGAIN! I absolutely do not reccomend this but it can be done. You really should invest in a Skytach.

Bob
COOKIEULT70
10-16-2006, 10:32 PM
http://www4.mailordercentral.com/heliproz/prodinfo.asp?number=804260

Here is one for under $90. All you have to do is look through the viewfinder and move the adjuster up or down untill the rotor looks like it stops spinning. The number on the LCD is your rotor rpm.