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04-01-2005 04:38 PM  13 years agoPost 1
jscott55

rrNovice

Madison, WI

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I've had a TJ Pro for the longest time. I'm happy with it.

I can never get the damn headspeed where I want it by calculating travel % values. I'd like to experiment with different headspeeds, but I've always got to use the tach because any calculated numbers I put in are way off.
(I've used a spreadsheet and calc on modelavionic's site.)

I've got a Futaba 9C. When I got the TJ Pro there was a little slip of
paper in there that said something like 'set the aux channel EPA to 95/95
for futaba 9C while calibrating.' Ok, I did, that. Question is, do I set them
back to 100/100 after calibrating? What should I set things to so that
the calculator actually works and I don't need to mess with taching every time?

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04-01-2005 05:14 PM  13 years agoPost 2
drmgcm

rrApprentice

Anywhere

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Hi There,

Okay now this is just my opinion, so please all that read this do not slate me.

I got one of the very first TJ some years back and then i went over to the TJPro
last year, and i have to say it is a fantastic gov. The problem i have always had is that by using the TJPro tables or calculator to set your head speed up, i have never got them to work as they say. I have always had to use a tach to re adjust in order to get the headspeed to be close to what i wanted, and quite often with different atv settings that in the tables or calculator.

If i am doing something wrong then maybe i might find out in this post, as for the part about setting the atv on the 9c to 95 when calibrating the TJPro, i have always done this. It must be noted however that in the instructions it does not mention anything about putting the atv back to 100, as i too always wondered about that point, but if you think about it, what logical purpose would it make to put them at 100, since you have already calibrated the TJPro on atvs of 95.


Regards

Dmac

IRCHA: 2528 AMA: 849513 R50V2, OS 50 Hyper, MPII, GY601, TJPro, 9CHP & Cool Power 30%

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04-01-2005 06:21 PM  13 years agoPost 3
Tomas Ahl

rrApprentice

Linköping, Sweden

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The ATV stays at 95.

Not very many have success with using the calculation spread sheet as far as I have read here and in other places. Most everybody resort to using a tach to get the head speeds set properly.

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04-01-2005 07:06 PM  13 years agoPost 4
jscott55

rrNovice

Madison, WI

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Yeah that's what I figured.

This weekend I'm going to figure out what the REAL
values for the 9C should be for various engine RPMs,
I'll post a chart.

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04-02-2005 01:04 AM  13 years agoPost 5
jtech

rrNovice

Las Vegas, NV

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I'm having the same challenges here with my TJ Pro & 9C. I did not have any sucess with using the gov mode; I had to program chanel 7 end points to get the desired headspeeds. Can someone share their sucessful TJ Pro / 9C setup so I can figure out what I am doing wrong?

Thanks,

Jim

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04-05-2005 04:07 PM  13 years agoPost 6
tommyk

rrNovice

Saint Louis, MO

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It is possible
I too had my head speed way too high. On my R30 it was not that big of a deal and I was not aware. On my r50 I thought the thing was going to explode. I did set it with a tach but then I wanted to know why I was wrong. It takes some math, it is not as simple as setting an ATV. You have a range that the governor expects as an input. That is what you get when you set the end points. Then those are mapped against the min/max speeds the governor supports, not speed that you want the heli to run. You then have to figure out the percentage of that range that correlates to your desired headspeed to figure out the actual values you have to put in your radio. It works exactly as verified by a tach but you really really have to read the directions. The tach is much easier to figure out.

Tom

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04-05-2005 04:11 PM  13 years agoPost 7
nickwap

rrVeteran

Berwick-upon-Tweed, Northumberland, England

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Hey Tom - would you like to share those calcs with us !!!!!

I have a TJPro / YS91 / 9303 combo and I agree the atv chart is b****cks

Nick

"Give me another one, this one's broke!"

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