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Home✈️Aircraft🚁Helicoptere-AlignOther › Pinion for Medusa MR-028-040-3400 motor
11-10-2005 11:10 AM  14 years ago
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Mike Wilson

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Toronto, Canada

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Pinion for Medusa MR-028-040-3400 motor
I'm building a T-Rex 450xl CCPM and I plan to run it completely stock for now. I am using the Medusa MR-028-040-3400 motor and would like some additional opionions about what pinion to use. I would like the headspeed to be around 2600 to 2700 RPM and I will be using a PH 35 speed controller and a TP 2100 Pro Lite pack.

I have read that some people are using the 10t pinion, some are using 11t and some even 12t. On Trextuning's website, he used the 11t in his test and achieved about 2750 with 95% on the throttle. On RCHover's website, they recommend the 10t pinion and say that it produces crazy power but they did not say at what headspeed.

Also, Can this motor be used reliably on 4 or 5s and if so, what pinion would be recommend for that setup as well.

Your thoughts would be greatly appreciated.


....led
Teambob00
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11-10-2005 12:21 PM  14 years ago
looseblades

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ocean gate N.J. usa

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i am using the same set up with a 10 tooth pinion. head speed will be near the 2800 to 3000 rpm (not sure were i set it ) . if you do the math you will be able to find the right head speed.
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11-10-2005 02:22 PM  14 years ago
smity777

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California

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Can this motor be used reliably on 4 or 5s
I would get their 2800KV motor if you plan to go 4S

Check out RCHover.com for info.

I am getting good results with my 3400 with 11T with TP Prolights 2100
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11-10-2005 02:34 PM  14 years ago
Mike Wilson

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Toronto, Canada

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Thanks for the replies guys.

Smity777,

What headspeed are you running and what speed controller are you using?


....led
Teambob00
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11-10-2005 02:41 PM  14 years ago
TheDudeVT

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Burlington VT

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I use the 11T with the 3400 motor (2739RPM theoretical at max throttle) and then set the THR curve to 92% or so to get 2500RPM on the tach

On 4S, I use the 10T with the 2800 motor (2758RPM theoretical at max throttle) and then set the THR curve to 92% / 2500RPM

If you have a metal head and CF blades, you can use the next pinion up (11T) and set your head speed to 3000 with the 4S setup, but the 3S config actually looses power at the higher headspeed-

If you haven't figured out how to use KC's spreadsheet- I recommend it-

TheDudeVT
T-Rex,3S2200,Medusa340011T,CC25,Berg5
4xHS56,GY401,RotorWorkz,alu head,CFblades
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11-11-2005 03:14 AM  14 years ago
smity777

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California

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What headspeed are you running and what speed controller are you using?
I am using a CC35 and my head speed seems to be around 2650ish. I think my tach sucks though. I tuned it down a few % to keep it around 2500ish. And I am talking at max pitch full throttle. Seems I can get super head speeds at 0 degree pitch. So I actually have a throttle curve like 95-90-80-90-95 or something like that.

I do a lot of flips and such during my flights and am getting a good 10 to 12 minutes atm.

Hope this helps
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11-11-2005 03:19 AM  14 years ago
smity777

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California

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oh yes my motor is the 28-32-3400 not the 28-40-3400. I am not sure these are different motors or if Trex tunning had a misprint.
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11-11-2005 03:36 AM  14 years ago
Mike Wilson

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Toronto, Canada

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Thanks Smitty,

I think it is a misprint as mine is also the 28-32-3400. The kit came with an 11T pinion and I will use that first and see what results I get. If the headspeed is too high at 90-95% throttle, I will change to a 10T pinion.

Thanks for the assistance guys.
Teambob00
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