HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (Full Version)

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root -> HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/11/2008 11:02:36 AM)

I'm planning on the Cermark rep's recommended HS-625mg's for the ailerons and two 645MG's in the tail of their newest 2nd version Cermark 9.?lb Sukhoi 31.

A 69 inch wingspan with aerobat/3D expected performance w/ a G23 in the nose

The slowness of the 645's at just .20/second@6v (torque is 133@6v or107@4.8v) is bothering me.

Does anyone think it's gonna make a big difference if the 625's (.13sec and 94oz.) are used all around being that their way fa.ster and only 13oz. less torque if ran at 6Volts
or
Am I better off going with the higher torque and less speed?




MikeMayberry -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/11/2008 8:54:01 PM)

Typically the 645's are plenty fast enough for 3D flying. If you want better performance I would suggest the digital version (5625/5645) or better yet, step up to the coreless motor 985MG or digital 5985MG.

Mike.



root -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/11/2008 11:24:15 PM)

Do you think the 625's have the strentgth to handle the rudder or elevator if I run them at 6volts.....even though there's a 13oz/ft difference?



root -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/12/2008 1:59:51 AM)

I don't wanna spend the $$ for the digitals.

I hope you don't mind but i presented this question on the 3D forums for more opinions from more 3D guys just to see if they agree.

Thanks for your time, Mike.



MikeMayberry -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/14/2008 6:44:29 PM)

I''d probably go with the 645 for the rudder, but the 625''s should be fine for the elevator and ailerons.

Mike.



root -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/14/2008 8:39:31 PM)

The Cermark rep said to go with the 645 on the elevator since it uses a single servo and a rod that connects the 2 sides together. I questioned the elevator recomendation myself cuz the usual stronger servo in the rudder is the norm.



MikeMayberry -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/15/2008 6:34:45 PM)

Sorry, I was assuming it had one servo per elevator half.... yes, the 645 would be a better choice.

Mike.



root -> RE: HS-645MG's versus HS625MG's on a Cermark SU-31- torque vs. speed? (4/15/2008 8:07:07 PM)

Alrighty then!

That''s my final decision.

Thanks



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