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Modefo's RC Helicopters . XHELI.COM . Autography FlightPower

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Gasser Model RC Helicopters > GV-1 with PCM-10X
 
 
Xcellgasman
Heliman
Location: United Kingdom

Thanks JB & Tom

I will have a go at changing the throttle servo. The only reason I used the 8700G is it was all I had spare that was JR.
I have a Futaba 9001, I will have a go with this (someone please tell me if this is a bad idea!).
I will have to wait until I can get my hands on my friends MA Tacho again before I can perform your test Tom, should have it tomorrow.
The irony is I was 50-50 on whether to spend some cash on the Tacho or go for the governor as they are both the same price (over here!).
I figured the governor was the best choice as it does both jobs.....I wish!
I can see I will end up with both!
Regards
09-24-2003 Over year old.
 
 
Billme
Key Veteran
Location: MS

8700 G !!! How I miss that...You need a lot slower servo ..
Bill
09-24-2003 Over year old.
 
 
Xcellgasman
Heliman
Location: United Kingdom

Okay, here goes again....
I have just replaced the 8700G with 9001, I have also slightly adjusted the throttle linkage geometry after discussing this with Bill Meador.
Firstly I have noticed I am hovering (governor off) at a slightly higher throttle percentage of around 40% (1500 rpm) instead of 35%, this is no bad thing and is more in-line with Bill posts.
Now the bad bit.....none of this has made any perceivable difference other than the governor does tend to kick in closer to mid stick instead of 3/4 stick. I have set the head speed in the governor at 1500 or 1600 on the aux 3 channel (I am NOT using code44, it is inhibited).
The actual head speed whilst set at 1500 was 1690 and it did maintain this speed when I put in full negative (4 degrees normal mode) which suggests that the governor is doing something. When I flick the on/off switch (aux2) to off she immediately returns to idle.
Why 1690??? I then tried something else.....I called up the head speed setting page within the governor and switched to 1500 and LEFT it at this page. I then started the machine and got up to governor speed and watched the screen. When in 1500 mode, the screen read 1500 and stayed there, when I then switched to 1600, the 1500 figured increased to 1600 but steadily, ie. you could see it count all the way from 1500 to 1600 within a few seconds (It does this immediately when the engine is not running). What does this suggest? I did not notice the head speed increase at all when I switched from 1500 to 1600 and I am not convinced it did.
Another thing, I also started the engine with the MAX rpm screen called up, after hovering around a bit (at 1690 head speed!), I landed and checked the screen and it reads ZERO, infact it ALWAYS reads ZERO, I have never seen this figure move, period.
Lastly, this may or may not be of any significance, but I was looking through the GV-1 manual (page 42) regarding Mixture ATV's. Now I know I am not using a mixture servo but I have noticed this......It says "operate the throttle stick and select "ATVA (SLOW SIDE) or "ATVB" (HIGH SIDE)".
On MY setup, ATVA is the HIGH SIDE and ATVB is the slow side.....i.e if my throttle stick is below mid point the screen on the GV-1 reads ATVB and if the throttle stick is ABOVE mid point, it reads ATVA. What is going on here?
When I changed from an 8700G to a 9001, the first thing I noticed was I had to do a servo reverse, obviously Futaba & JR operate in different ways, and I half expected this to reverse these A & B values, but typically no chance!
I am still thinking I have an electronic fault issue here.......maybe.
Any more help would be appreciated from any corners of the world......I am sorry to have such a difficult problem to describe, I am doing my best.....I hope you guys are making sense of my ramblings......
Regards
09-24-2003 Over year old.
 
 
Xcellgasman
Heliman
Location: United Kingdom

Hi Tom, I really appreciate your help, here is my settings. I have reset the GV-1 in the hidden menu and all values are default (I did this a few days ago as I figured I should'nt need to alter any parameters anyway).
I have removed and checked the ground wire from the statorgator, re-fixed it, I am sure this is not the issue.

Throttle AND trim are set to zero, exhaust is a zimmerman X-cell transversely rear mounted type (I forget the part no.). (It is definately not full of carbon as it has only run for a few gallons).
Here is the GV-1 screens in order....

0 - rpm
0 - max
1500rS1 (or 1600rS3 switchable through Aux3) (NO S2 as this is a 2 position switch)
Disp Rot - Flashes
GRt 6.43
SWPt ON - Flashes
StSw INH - Flashes
SWCd OFF - Flashes
Gvoff INH - Flashes
5.2V
MxMD Gov - Flashes
MG1 0% - Flashes
ATVB 100% - Flashes (with throttle fully closed!)
Msx Norm - Flashes
Mtrm INH - Flashes
B/FS ACT - Flashes
B/FD 13% - Flashes (this figure goes to Zero at half trim (idle))
Lmt Idle - Flashes
Sens 0% - Flashes

ATV's are Throttle 120%/120%, Aux2 100% 100%, Aux3 100%100%

I still cannot understand why the Max. Screen ALWAYS reads zero, so I
have had a play in my garage with a dremel and one of the Futaba magnets and sensor. I mounted one of the magnets in the lid of an aerosol can, and then mounted the lid on my Dremel via an arbor. I then plugged in the Futaba magnetic sensor to the GV-1 and took a reading with the MAX screen called up. It reads 1800 and stays on the screen afterwards. I conducted this test whilst the GV-1 was fully plugged in and switched on to the helicopter, the only difference being the sensor was getting a reading from my dremel and not from my engine. I tried to get the throttle servo to move whilst changing speeds on the dremel, but it stayed still no matter what I did. I could not get the throttle servo to move at all in relation to speed of the dremel which surprised me. When I was on the Rpm screen and set the dremel to 1100rpm and the GV-1 to 1100 rpm, the RPM screen changed to RPL 1100 suggesting it had locked onto that speed, but when I slowed down the dremel the throttle servo did not move at all to counteract the slowing speed. I know this seems a desperate test, but it only took ten minutes to conduct and I did learn one thing, i.e the MAX screen does work and lock the last given highest rpm. Why then does it not work when I am using the statorgator? I am completely confused......
Thanks for all your input guys, we WILL get to the bottom of this one, I have no doubt.
Regards
09-24-2003 Over year old.
 
 
ImRich
Veteran
Location: Derry, NH USA

I'll leave you to the capable hands of the other guru's here.

But I will make a couple of points.

I have switched to MAX after a flight and see what my maximum RPM was. I do not have to switch to MAX before flying to get a reading.

Second, if you want to see if it's your statorgator which may be faulty, I have an easy way for you to test it. This procedure is not that hard.

Go to my gallery and download my instructions on how to use the mageneto magnets to trigger the GV-1. It shouldn't take you long (maybe an hour or so) to make a bracket and mount the stock sensor. If it works then you'll know your stator gator is faulty and you can then send that to be repaired or replaced.

Here's the link to the document in my gallery. This is a word document. I hope you can read it:

http://runryder.com/helicopter/gall...ns_for_G-23.doc

Rich

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Rich
09-26-2003 Over year old.
HOMEPAGE  
 
 
Airman98
Key Veteran
Location: Southern Illinois

The GV1 will only read a max Rpm only after you have gone to full power. If you only take off and hover then land it will read 0 but if you put in full power then land it will show max rpm.
Tim
09-26-2003 Over year old.
 
 
Xcellgasman
Heliman
Location: United Kingdom

Problem solved!

At long last after a very frustrating week I have got to the bottom of this saga......the GV-1 was faulty!! I exchanged it for a new one, plugged it in and voila! My first flight with headspeed set at 1500, she stayed at 1500 and at the end of the flight the MAX screen read 1510!
What a relief!

Thankyou all so much for your input, It just goes to show that the odd faulty item still gets through QC. Only last week I was helping a newbie get started with his Raptor, he bought everything brand new and when I was getting the radio set up, the PCM-649S Rx would not work, It exhibited some of the strangest behaviour I have ever seen from a RX (i.e every command input had a 1 second delay!). It made for some exciting flying for a while! The shop took it back and said they had never seen anything like it before either.

Thanks again, no doubt I will airing more of my grievances in the future! Thanks Tom Fiddler for all your help, the Statorgator really is a dream come true for us gasser users, I am sure it will keep you busy for good while!
Regards
09-26-2003 Over year old.
 
 
ImRich
Veteran
Location: Derry, NH USA

I'm so glad you solved this problem.

I learn a lot from reading what problems and issues other people post, and all the solutions and ideas.

The MOST important thing is that you post the solution! So thank you for that.

In fact, I think one of the 'rules' of asking for help is that you have to post the final solution. Many people simply go away after their problem is solved and that leaves us all hanging!

Thanks for letting us know!

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Rich
09-27-2003 Over year old.
HOMEPAGE  
 
 
Xcellgasman
Heliman
Location: United Kingdom

Rich

You are very welcome, I am new to these Internet Forums and my only regret is not using them years ago! What a great way to exchange ideas and knowledge.
I just hope they continue to be the success that they already are.
Regards
09-27-2003 Over year old.
 
 
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Gasser Model RC Helicopters > GV-1 with PCM-10X
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