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HelicopterMiniature Aircraft Whiplash & Fury 55 › not enough tail pitch
08-06-2007 12:13 PM  10 years agoPost 1
windyone

rrApprentice

York, England

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Ill try and explain my problem.

I have upgraded my Fury basic with the open tail gearbox. My tail pitch yolk (the part that slides up and down the tail shaft and connects to the tail blade grips)will hit the tail rotor bell crank if I didnt limit it with the servo travel. Problem is there is hardly any pitch at this limited setting and so piro in that direction is slow. There is plenty of pitch in the other direction.

I am struggling here but it looks like I may need to use a different tail pitch yolk that gives better clearance. Looking at some photos it looks like ther may be different ones.

Sorry no photos at the mo but any thoughts?

Thanks

Mick

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08-06-2007 04:26 PM  10 years agoPost 2
oldboldpilot

rrKey Veteran

Southern California

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windyone,

Have you tried changing the linkage to put neutral more to the side that had plenty of pitch? Take some from that side and give it to the limited side?

Helis are Man's Defiance of the Laws of Nature - OCHC

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08-06-2007 06:43 PM  10 years agoPost 3
Dr.Ben

rrMaster

Richmond, VA, USA

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1. Borrow camera.

2. Post pic.

This is NOT a typical issue. I can tell you what to do after I see a picture.

Ben Minor

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08-06-2007 07:18 PM  10 years agoPost 4
windyone

rrApprentice

York, England

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Dr Ben. Hrees some photos. I know I have a brass spacer in but this absolutely makes sure I cannot get the tail pitch yoke to hit the tail rotor bell crank.

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08-06-2007 07:22 PM  10 years agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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Get in touch with Dave Wilshere (Motors and Rotors). You may need a different bellcrank standoff because that box, as supplied, is designed to use the Extreme t/r pitch control system. Several years ago I saw a thread with just this same issue.

If you can't get an answer from him, I'll dig it up for you over here.

Ben Minor

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08-06-2007 07:25 PM  10 years agoPost 6
Jag72

rrProfessor

South of Boston

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Brass spacer

Why do you have that spacer?...That looks to be the problem?

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08-06-2007 07:26 PM  10 years agoPost 7
shawgl

rrKey Veteran

Murrieta, CA

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Here is a pic of mine.

Loose the spacer, to keep it from contacting at either extreme you should use your limits on the gyro/rigging of the t/r control linkage.

In God we trust, everyone else we monitor.

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08-06-2007 07:48 PM  10 years agoPost 8
windyone

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York, England

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Thanks Guys. Ill get in touch with my local MA supplier. Just as a matter of interest whats the max pitch I should get going with the torque ?

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08-06-2007 08:02 PM  10 years agoPost 9
shawgl

rrKey Veteran

Murrieta, CA

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You should mechanically set your bird up to the limits and tone it down with the Gyro/radio depending on what you are running. If you are running a heading hold gyro which I'm sure you are the gyro should be able to use all of the t/r pitch available if it needs it to in order to correct for torque changes. If you limit it, in this case with a brass spacer you are short changing the gyro's ability to correct for torque changes along with your ability to piro at a rate that suits you. If you look on M/A's website you can pull up the electronic version of the manual for the Extreme and the gearbox assembly. No where in there does it show installing that spacer.

In God we trust, everyone else we monitor.

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08-06-2007 08:05 PM  10 years agoPost 10
daren

rrVeteran

Hampshire Sponsored​by Quick UK

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On your tail grips put the ball in the other hole!

Daren
Using the ground to reverse engineer

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08-06-2007 11:54 PM  10 years agoPost 11
shawgl

rrKey Veteran

Murrieta, CA

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Take a look at the manual, starting at about page 105 or so. It has the build up of the open tail box. The spacer is causing it.

http://www.miniatureaircraftusa.com...ual_Current.pdf

In God we trust, everyone else we monitor.

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08-07-2007 04:31 AM  10 years agoPost 12
Jim Patterson

rrApprentice

AREA 51 Roswell

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I'm pretty sure these guys are correct about the spacer, looks like the one that's used inside the closed tailbox as a gear spacer? It's definitly restricting your throw to that side.

Highly addicted to carbon fiber.....

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08-08-2007 02:24 PM  10 years agoPost 13
GyroFreak

rrProfessor

Orlando Florida​...28N 81W

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OK, I'll trow in my two gallon expertize.
As he said the spacer is to prevent
makes sure I cannot get the tail pitch yoke to hit the tail rotor bell crank.
Perhaps the tail rotor shaft is too short, allowing the rotating tail pitch assy to hit the bellcrank assy.. A longer one would move the tail rotor out allowing more travel. Check to make sure the tail output shaft is the correct one, length wise..
A short shaft limits the travel, with a really short one you would get no travel...

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-08-2007 02:30 PM  10 years agoPost 14
shawgl

rrKey Veteran

Murrieta, CA

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Considering the gearbox comes assembled and complete and this is a new install, it's hard to have the wrong shaft. Knowing that if you look at the pictures both of his, mine, and the assembly manual... It's pretty clear what the issue is. Not trying to be a smart a$$ but RTFD is what I usually do when there is a problem.

Greg

In God we trust, everyone else we monitor.

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08-09-2007 01:03 AM  10 years agoPost 15
gryrck

rrNovice

east windsor CT

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looks like the shaft is to short to me also. From the outer bearing face to the end of the shaft measures 47mm, does yours?

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