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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Important update for RC motor and gv -1
01-13-2013 03:00 AM  7 years ago
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rbort

rrProfessor

Franklin, MA - USA

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Important update for RC motor and gv -1
If you're using the gv-1 with the RC motor, in order to prevent the hunting that happens when you unload the pitch quickly (example flying tail down full negative pitch and then you go to zero pitch), then do the following:

1) Change the hidden menu glmt setting from 25 to 30%
2) Change the throttle servo arm to the small wheel that comes with the Futaba servos, shortest hole which is about 7.5mm.

My travel limits ended up to be 110 on the low side and 125 on the high and the high does not open the carb 100% (to the stop) but the plate it pretty much vertical and doesn't matter anyways.

Your machine will run much better with this setup and make the gv-1 just absolutely perfect.

Enjoy!

-=>Raja.
MA 1005 Hanson 2703D, 4325 flts
Spectra 27 3DMax, 3442 flts
Whiplash V1-2 Hanson 300, 1967 flts
Whiplash V2 Hanson 300, 837 flts
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01-13-2013 04:18 AM  7 years ago
Carey Shurley

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Orlando, FL - USA

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Change the throttle servo arm to the small wheel that comes with the Futaba servos, shortest hole which is about 7.5mm
you might note that my original build thread last year recommended putting the throttle control ball on the servo side 7.5mm from the servo center.

you can see it here near the bottom of the page: Whiplash Gas throttle setup

there was a reason. Most of the Futaba arms have a hole at 7.5mm except for the larger ones

The original user guide I submitted included that setup as well however one of the reviewers asked that it be changed.
Proprietor - Gas Powered Helicopters
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01-13-2013 04:43 AM  7 years ago
rbort

rrProfessor

Franklin, MA - USA

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Cool Carey
I never saw that actually, that's quite a big document you got there very nice indeed and I'll be first to admit I didn't go through it or watch any of the videos...

In the manual it shows it as the 3rd hole in the + servo horn which is about 13.5mm. I didn't have mine that far out to begin with, was at 8.5mm but after some experimentation I found that 7.5mm works much better as indicated above.

You may want to have them update the manual to reflect 7.5mm for future builders of the kit and thanks for all your documenting efforts, you do good work

This info applies to the Spectra with the helibug spark kit and RC motor as well as the whiplash.

-=>Raja.
MA 1005 Hanson 2703D, 4325 flts
Spectra 27 3DMax, 3442 flts
Whiplash V1-2 Hanson 300, 1967 flts
Whiplash V2 Hanson 300, 837 flts
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01-13-2013 10:45 PM  7 years ago
geomecc

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Long Island ,NY

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is this just for the rc format or can the puh type benefit too?R I P Roman Jr. Team SKOOKUM SRW EFC
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01-14-2013 02:02 AM  7 years ago
rbort

rrProfessor

Franklin, MA - USA

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Arm
Its a function of the carb arm to the servo arm relationship. On the RC motors people use the fixed arm that comes with the RC motor making the servo arm ideal at 7.5mm. On the puh motor the carb arm is longer on my 1005 (would be the same on the stock Spectra), so my servo arm is also longer at approximately 13.5mm out.

You'll have to play with the length to optimize it, that is if you find that your governor is hunting and you need adjustment.

-=>Raja.
MA 1005 Hanson 2703D, 4325 flts
Spectra 27 3DMax, 3442 flts
Whiplash V1-2 Hanson 300, 1967 flts
Whiplash V2 Hanson 300, 837 flts
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01-14-2013 04:08 PM  7 years ago
rc3po

rrVeteran

Danville, Illinois

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Thanks Guys!
Very good, thanks for bringing that back to my attention. My Spectra/Spark was setup with a 1:1 horn ratio from the puh. Actually that was the way I was taught to setup all my throttles. I will have to change that as I'm sure it will result in a smoother throttle. Comes back to mechanical advantage 101.

I would like to mention tho that I have had luck reducing hunting with my radio as well. I'm sure we all agree that servos aren't going to get any slower and sometimes react too fast for our Govs. Our newer radios (dx18, dx7s, dx8) (and I'm sure Futabas as well I just don't know which ones) have the ability to slow down servos very easily in the servo menues. I had quite a time getting rid of hunting on my nitro when activating the vbar gov until I slowed the servo down. Changing the servo mechanics hadn't occurred to me at the time.
Happay Happay Happay...
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01-14-2013 04:26 PM  7 years ago
Carey Shurley

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Orlando, FL - USA

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once the governor engages (not rev limiter) the transmitter setting for servo speed and even throttle curve will be irrelevant as the unit takes over control.

Of course if the throttle curve drops below the engagement point of the governor or you turn it off then the tx settings become the default operation.
Proprietor - Gas Powered Helicopters
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01-14-2013 04:35 PM  7 years ago
rbort

rrProfessor

Franklin, MA - USA

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Carey, respectfully I beg to differ
once the governor engages (not rev limiter) the transmitter setting for servo speed and even throttle curve will be irrelevant as the unit takes over control.
The throttle curve is always relevant. Example:

(1) If the curve is too low, the governor will disengage even after it engaged.

Remember the governor looks at the throttle % and if you go below 20% it will disengage. Also if you modify the ATV limits and you bump them up to fix an idle or engagement and you don't relearn the idle limits you can get stuck with a governor on even if you hit throttle hold.

(2) If the curve is too high, when you switch flight modes from one to the next, you will see a rev up first on the motor and then a slow back down as a reaction from the governor.

The throttle servo tends to go to where the curve is when you switch flight modes, and then the governor modifies it from there. That's why you want to have them pretty close - curves to governor requested speeds.

To be clear, this refers to the gv1 as I use that exclusively.

-=>Raja.
MA 1005 Hanson 2703D, 4325 flts
Spectra 27 3DMax, 3442 flts
Whiplash V1-2 Hanson 300, 1967 flts
Whiplash V2 Hanson 300, 837 flts
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01-14-2013 05:00 PM  7 years ago
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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1) yup I said that in my post
2) only if u switch between Sx settings in the gov, which disengages the gov and it has to re-engage. If yif u just change RPM without changing the Sx setting the throttle curve wont influence the RPM even momentarily
Proprietor - Gas Powered Helicopters
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01-15-2013 06:13 AM  7 years ago
rbort

rrProfessor

Franklin, MA - USA

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Update
Test flew the 1005 today after changing the glmt number from 20% to 30% to match the RC motor settings and found that it overspeeds alot.

So to answer your questions, no the setting I gave in the first post were strictly for the RC motor with the 990 carb arm (30% glmt and 7.5mm on the servo horn).

In the 1005 it uses the airplane style long horn (came stock with the kit) on the 643 carb and I'm using the hole on the * futaba horn at 13.5mm out. With this setup 20% on glmt works better.

Hope this helps and keep those rotors turning!

-=>Raja.
MA 1005 Hanson 2703D, 4325 flts
Spectra 27 3DMax, 3442 flts
Whiplash V1-2 Hanson 300, 1967 flts
Whiplash V2 Hanson 300, 837 flts
SHARE  PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
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