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T-REX 450 › Medusa Throttle Curves
08-09-2007 09:01 PM  10 years agoPost 1
jhamlinjr

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Milledgeville, GA,​United States

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Im currently using a 28-32-3400 with a 12 tooth pinon and TP2200 Extremes.My throttle curves are 100-95-90-95-100. Are these the most appropriate and efficient curves for this setup? Also, what would I get out of running a flat 100?

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08-09-2007 10:10 PM  10 years agoPost 2
helimatt

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Lafayette, IN

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I run flat 100% with that motor- likely you won't notice a huge change but the cyclic response will be more immediate if the head speed is higher. Try the curve you listed there, and see if you like it.

That motor runs pretty hot- just to warn you. I let it cool quite a bit between flights- never had to with the JGF 450TH I ran before.

Never, ever, ever, ever give up.

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08-09-2007 10:32 PM  10 years agoPost 3
Edge

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Indianapolis, IN

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That motor does not have to run hot. I run that motor with 12T pinion, controlled by Jazz ESC in governor mode, powered by TP 2200 batteries. I do have installed the Align motor heat sink. Even in the very hot weather we have been experiencing motor comes down with temp never higher than the 120's. It helps also to make sure everything moves as freely as possible.

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08-09-2007 10:59 PM  10 years agoPost 4
docjoe

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Stockton, CA United​States

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I usually run 100-95-100.

Joe
We haven't seen Colonel Angus around these parts for years!

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08-09-2007 11:44 PM  10 years agoPost 5
helimatt

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Lafayette, IN

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Edge-
Much cooler than what I am seeing! I don't have the heat sink-I plan to add one. I wonder if the Jazz being a better ESC has something to do with that- i am using an ACE distributors ESC (same as on the stock Thunder Tiger Mini Titan). Works well, but like I said the motor gets hot. Everything on my machine is very smooth and loose, so no problem there. I think I'm running a 13T pinion (can't remember- I'll check)- so that may be part of it.

I have a Quark ESC I may try. Can't afford the Jazz right now... although I could sell all the "lesser" esc's I have sitting around and just get the Jazz.

Never, ever, ever, ever give up.

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08-09-2007 11:59 PM  10 years agoPost 6
jhamlinjr

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Milledgeville, GA,​United States

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I would like to try back to back flips but coming out of my first one my headspeed seems to take a second to build back up. Would running 100 flat help with that?

By the way, mine runs real hot too. I wait about 15 mins after a flight for cool down. No heatsink...yet.

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08-10-2007 03:55 AM  10 years agoPost 7
helimatt

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Lafayette, IN

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Running 100% should help, plus you may want to back off of the swash travel in pitch (elevator). cyclic inputs can cause bogging too, and also main blades make a difference.

I checked- I have 12T RevCo pinion. I fly HDX carbon mains (325mm) which are very efficient, fly the same as Align white carbons. With this setup I can easily do consecutive flips forward or backwards, climbing all the while if I choose. You do have to be judicious with the collective management to keep the headspeed up, but it works. I can do tic-tocs, but they bog the rotor pretty badly unless I sorta do them in slow motion. Get too agressive and the headspeed falls off. I have a lot of work to develop my tic-tocs though, so it may be my technique there.

Try 100% straight across, and back off your swash travel some in aileron and elevator, see if that keeps the headspeed from decaying as you do the flips.

Never, ever, ever, ever give up.

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08-10-2007 04:12 AM  10 years agoPost 8
jhamlinjr

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Milledgeville, GA,​United States

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Thanks Helimatt and others, I will try those suggestions. Im flying 325 woodies and have never flown a good set of carbons. I agree with good collective management. That seems to be the secret to smooth flying. At least on the sim it is and I try to focus on it when I fly.

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08-10-2007 04:28 PM  10 years agoPost 9
SSN Pru

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Taxachusetts

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From what I understand,

the main (older) reasons ( before mainstream E-Power) for using a "V" curve, ie 100-95-90-95-100 or any other combination that resulted in a "V" curve was to prevent the nitro engines from overspeeding and blowing up when the rotor head was unloaded during manuevering.

with electric, this is no longer a concern and you can run 100% flat curves.

another reason for using "V" curves was to get a more consistent HS through manuevers. Governors took care of this problem for nitro and E-Power. Consistent HS should give the helicopter a much more consistent flight feeling because as the HS changes, the control authority changes.

If you arent terribly concerned about consistent HS then just run a 100% curve. It much healthier and more efficient for your ESC too! Its sort of counter-intuitive to think that runnign your ESC at 100% vs 80% will be better for it but it seems to work.

Stupidity can be cured. Ignorance is for life!

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08-10-2007 04:51 PM  10 years agoPost 10
jhamlinjr

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Milledgeville, GA,​United States

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I have heard that running 100 percent was actually more efficient for your ESC. Thanks for the explanation. Im running the stock Align ESC. I would like to at least try governer mode but I have heard to try it with another ESC, not the Align.

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