RunRyder RC
 3  Topic Subscribe
WATCH
 1 page 423 views POST REPLY
HomeAircraftHelicopterMain Discussion › GV-1 with os 32,MP30size
12-06-2004 06:21 PM  13 years agoPost 1
parksi

rrApprentice

England

My Posts: All  Forum  Topic

Hiya chaps,
I posted a add last week regarding the GV-1 not holding a fixed rpm i.e overspeed at 0 pitch centre stick ....+9,-9.. my friend told me that he read a post saying the the GV-1 hangs up on the MP30 (not keeping rpm constant) so i then richened the engine up by maybe 6-7 clicks out and it improved then al little more and better still but what i do not understand is i thought that putting this pipe on would increase power and my needle was only open 1.25 turns out running cool power 10% i then changed the fuel to magnum 20% thinking i could close it more like to 1 turn open because of the more oil content but when i do this my GV-1 overspeeds so i open the needle maybe half a turn and the GV works well and little more it gets better i.e no overspeeding at 0pitch..but inturn i am losing power from my engine thats why i am ????? the GV-1 with the MP30 ..i have just ordered a new MP11 50 size for the OS32 maybe it will breath a little better and not overspeed .... if anyone knows of this problem i would be very interested to read how they have corrected this problem i am havin or
is it my set up...
raptor 30,os32, mp30, 20% magnun,,GV-1running 2speeds 1500&1900
|Cheers Chaps

PM  EMAIL  Attn:RR  Quote
12-06-2004 06:36 PM  13 years agoPost 2
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

Well, I'll take a guess...

The MP30 wants to run the engine at some RPM. When at zero pitch the load is reduced and the MP30 can actually get the engine to that RPM when combined with the fact that the GV-1 is reluctant to pull the throttle below something like 32% (read that here on RR, but I may be off a percent or two). Those two things combined result in the overspeed at zero pitch.

What is the headspeed when it does this? Perhaps you should increase your headspeed to that and then you will be on the pipe and not below it. Actually you want to be just above the pipe RPM.

- John

PM  EMAIL  GALLERY  Attn:RR  Quote
12-06-2004 06:51 PM  13 years agoPost 3
parksi

rrApprentice

England

My Posts: All  Forum  Topic

cheers John
Well i am running 1900 headspeed but after the flight i check the GV-1 read out and it reads max rpm 1950-80 so its overspeed alot and also its screams but as i said when i richen the needle it stops overspeeding but thats in turn zaps the pipes power and engines so i am thinking of leaving the GV-1 off unless the new MP11 50 will sort it out with maybe a bigger area to breath release more gases so its not hanging up on rpm..i just dunno it really gettin me down thought the GV-1 would make it fly better not worse ....but wait for new pipe and see what happens ...
cheers john
parksi

PM  EMAIL  Attn:RR  Quote
12-06-2004 06:59 PM  13 years agoPost 4
JKos

rrProfessor

Redondo Beach, CA

My Posts: All  Forum  Topic

Well, it sounds like you just need to bump your headspeed up to 1950 RPM and retune. I bet you'll get a lot more power. 1950-2000 RPM is about what you will read guys running 30's at to get performance out of them.

What blades are you running? I ask for safety reasons. Not woodies, I hope.

- John

PM  EMAIL  GALLERY  Attn:RR  Quote
12-06-2004 09:22 PM  13 years agoPost 5
Big Edge

rrApprentice

Oldsmar, FL USA

My Posts: All  Forum  Topic

From the GV 1 Manual:
The use of a tuned pipe type silencer may cause the engine throttle
response to be substantially different from that with a normal muffler.
Adjust the needle (and pipe length) so that engine speed changes are
proportional to the throttle opening. If the engine speed does not
change linearly, the governor will not perform satisfactorily with a muffler
or a pipe that does not allow the carburetion to be linear.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 423 views POST REPLY
HomeAircraftHelicopterMain Discussion › GV-1 with os 32,MP30size
 Print TOPIC  Make Suggestion 

 3  Topic Subscribe

Sunday, June 24 - 2:05 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online