increasing throttle end point for higher headspeed  
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All Forums >> RC Helicopters >> Electric RC Helis >> T-Rex heli >> increasing throttle end point for higher headspeed
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increasing throttle end point for higher headspeed - 6/13/2008 2:35:22 AM   
noobflyer01


 

Posts: 970
Joined: 2/17/2008
From: , FL, USA
Status: offline 		hey guys i went to my LHS and asked the guys there for effective ways of increasing headspeed. i told them i have the trex 450SA with the 430XL motor and BL35X esc. one of the veteran heli pilot there told me that you can increase the throttle end point for higher headspeed. my throttle end point is at 100 right now. he told me to increase the end point to something like 120. he said that will bring my headspeed to 3000rpm. he also said that flight time will be reduced. but the bird will be ballistic i know i can increase the headspeed by putting a higher teeth pinion also.

what are your opinions on this?

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EF mash rescue Co-ax, HBK2, HBFP, Belt CP, Blackhawk 450, EXI 450, trex 450 SA, mars 480, mini titan e325, gazaur poseidon.
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RE: increasing throttle end point for higher headspeed - 6/13/2008 3:40:57 AM   
babyhuey



Posts: 567
Joined: 9/3/2007
From: St. James, MO, USA
Status: online 		What pinion are you running now? Some guys are running headspeeds as high as 3200 rpm but don't do that with wood blades!

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(in reply to noobflyer01)
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RE: increasing throttle end point for higher headspeed - 6/13/2008 3:47:13 AM   
noobflyer01


 

Posts: 970
Joined: 2/17/2008
From: , FL, USA
Status: offline 		i'm using the 13t pinion. i have a 15t i might want to try. what kind of setup do they have to run 3200rpm? and also do you guys use the soft start on the align esc? i'm not sure if i like the soft start featue.

The guys at my LHS said they run the woodies at 3400rpm-3500rpm without any problems.

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EF mash rescue Co-ax, HBK2, HBFP, Belt CP, Blackhawk 450, EXI 450, trex 450 SA, mars 480, mini titan e325, gazaur poseidon.

(in reply to babyhuey)
       Post #: 3

RE: increasing throttle end point for higher headspeed - 6/13/2008 3:01:13 PM   
Skarn


 

Posts: 699
Joined: 1/1/2007
From: Pasadena, MD, USA
Status: offline 		The guys at your LHS are wrong for flying woodies at that high of a headspeed! They risk them blowing apart in flight. THe woodies even have warning on them telling you to not go above 2600-2800 depending on the brand.

Anyway, with a 13t pinion, if you run carbon blades and are using the XL motor, you should be at or over 3000 already. I don't see how changing your throttle endpoints on an electric motor would do anything, but you could always try What throttle curves are you running?

I LOVE soft start. I allows me to have throttle hold on, idle 1 chosen and flip off TH and allow it to slowly spool up and take off already in idle 1. Besides that, it's a safety feature incase you accidentally bump the throttle stick or flip off TH before you are ready.

Skarn

(in reply to noobflyer01)
       Post #: 4

RE: increasing throttle end point for higher headspeed - 6/13/2008 6:20:51 PM   
airjawed


 

Posts: 42
Joined: 3/12/2008
From: memphis, TN, USA
Status: offline 		The ESC controls the motor and if it is programmed properly it should be able to use the entire throttle range from the transmitter. What the transmitter says and what is read by the reciever or servo or gyro doesn't match up perfectly all the time. But if you go through the programming setup for the esc it takes a reading for the high point and low point for the throttle stick. You'll only get a higher headspeed if the esc wasn't programmed properly(wasn't using the full range available).

13T should get you into 3000 rpm headspeed easily... I'm using the governor mode set to 3000 rpm headspeed and am getting great handling. With a 2200 mah battery i get 8 minutes of flight.. If you go any higher with your headspeed it will start getting very hard on your batteries. That is something to think about. Trust me..I've tried.. I wouldn't even think about a 15T on there.. using a tooth that high means your motor is going to be working too hard for your batteries.. the other option is to use a 4S Lipo and gear lower...you have to gear lower(do not leave the gearing the same) otherwise again you will be overgeared.

As for wooden blades for 3000 headspeed...I admit I have done it but I don't fly that hard.. wooden blades can break in hard manuevers.. don't risk it... get carbon fiber and be safe!!

(in reply to Skarn)
       Post #: 5

RE: increasing throttle end point for higher headspeed - 6/13/2008 6:25:54 PM   
BarracudaHockey



Posts: 10786
Joined: 7/13/2003
From: Orange Park, FL, USA
Status: offline
quote:

But if you go through the programming setup for the esc it takes a reading for the high point and low point for the throttle stick. You'll only get a higher headspeed if the esc wasn't programmed properly(wasn't using the full range available).


Exactly!

The ESC is a switch (more or less) that sends pulses of full power the motor. The higher you have the throttle set, the less time between pulses until at full throttle the power is on all the time.

So as long as the ESC knows what full high and low stick is, regardless of whether you set the end points to 75/75 or 150/150, full power is always going to be always on, you can't get any more out of it. And raising the end point after you tell it what high stick is, won't do anything.

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(in reply to airjawed)
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RE: increasing throttle end point for higher headspeed - 6/13/2008 7:13:34 PM   
noobflyer01


 

Posts: 970
Joined: 2/17/2008
From: , FL, USA
Status: offline 		thanks for the great inputs guys. i know my trex is already ballistic with the current setup its just that i like it so much. all this extra headspeed is really improving my flying skills. everything is so responsive. i guess i'll stay with the current setup for safety. I do have carbon blades but they have led's on them and i don't want to wreck my $50 blades on one wreck. I go to the LHS and get some mscomposite carbon blades today and see how they feel. thanks again for your responses.

_____________________________

EF mash rescue Co-ax, HBK2, HBFP, Belt CP, Blackhawk 450, EXI 450, trex 450 SA, mars 480, mini titan e325, gazaur poseidon.

(in reply to BarracudaHockey)
       Post #: 7

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