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CarbonXtreme . Midland Helicopters . HeliProz

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Gasser Model RC Helicopters > Predator gear ratio.
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

I guess that the 15 tooth pinion and the 88 tooth spur (5.87 to 1) is stock on the Predators but I bought mine second hand with all the goodies, full metal head and tail, v2 pipe and upgraded this and that running the stock 231 but noticed my gears were 14 pinion and a 90 tooth spur (6.43 to 1). While mine seems to have plenty of get up and go I wonder if this is a popular route for the Predator flyers to go? I'm finally going to program (God willing!) the GV-1 and this thought again crossed my mind. I searched and this (6.43 to 1) seems to be the most common ratio on the 231/260 motors? Where is the sweet spot, rpm wise, for the stock 231? How about the 260? Stock with the Century pipe that is!

Tom

I'm married so you know I am no stranger to pain!
09-21-2008 11:29 PM
 
 
HELI PRO 007
Heliman
Location: IRELAND

12500RPM is sweet spot for 231 engine and under 12000RPM for stock 260 engine. hope this help
09-21-2008 11:51 PM
 
 
mcfast
Veteran
Location: Canada

Your 14/90 should be good!
09-22-2008 01:10 AM
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

Thanks, I assumed so. The guy I bought it from said it had all the necessary upgrades to have it fly like mad. It surprizes me how agile it is for a 12 or 13 lbs heli compared to my 10lb electric 90. Since i've always been big electric I can't wait to get this govener working, pitch curves are a pain.

Tom

I'm married so you know I am no stranger to pain!
09-22-2008 02:01 AM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
Since i've always been big electric I can't wait to get this govener working, pitch curves are a pain.

That surprises me coming from an electric guy. With an electric it is all about tweaking the curves and making the ratios optimum.

Ace
What could be more fun?
09-22-2008 05:59 PM
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

I don't know of anyone running an electric set-up on pitch curves. With a govener you just gear it right and go.

Tom

I'm married so you know I am no stranger to pain!
09-22-2008 09:17 PM
 
 
AceBird
Elite Veteran
Location: Utica, NY USA

Quote 
I don't know of anyone running an electric set-up on pitch curves.

Really, so if you pull the RPM down you just let it cook and hope it doesn't smoke? Doesn't sound right to me.

Ace
What could be more fun?
09-22-2008 10:05 PM
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

Quote 
Really, so if you pull the RPM down you just let it cook and hope it doesn't smoke? Doesn't sound right to me.

Are you kidding me? The goveners compensate for load by giving the motor more power. You have to gear to use the motors power which means you have to have a proper motor/gearing to keep the motor from bogging.

That is kinda just a silly statement you made. Prolly one of the most childish things you have written. I betcha there is not more than a handfull of pro's that don't either use the Kontronic esc's govener, Castle Creations esc's govener or the E-Multie Govener which is an add-on to any electronic speed control.

I would suggest you investigate prior to comment!

Tom

I'm married so you know I am no stranger to pain!
09-23-2008 01:12 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Ace is catching on a typo you made. You said that people don't run electrics on pitch curves. Of course they do, what they don't do is run them on throttle curves.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
09-23-2008 01:58 AM
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

Oh....My bad!

Tom

I'm married so you know I am no stranger to pain!
09-23-2008 01:59 AM
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

While that was a typo, I read this as Ace (correct me if I'm wrong) was surprised to hear that electrics are ran with a flat throttle 'curve'.

...yep...
09-23-2008 03:30 AM
 
 
AGRAV8
rrProfessor
Location: Mosquito Coast......Houston Texas

sweet spot

Tom:
I have ran the stock 231 from the 5.8 ratio all the way up to 7.07 which is where I am at now swinging 720's. Oh, and I pull 2,000 rpm on this. I wanted to see just what the "other" guys were going to have for tuning issues at that speed. Have not backed it down yet, but probably will.

6.43 will do fine for general sport flying. You can step it up SOME for better engine recovery in 3D, but the 7.07 I have is a bit much. 6.7 would be fine...if your not happy with the 6.43

This on an original Century Torpedo version 0.9 that is heavy, unchromed, and sounds SWEEEEEEEET. Now, if there is a v4 coming out... I'm gonna have to try one.

GOOD guy list-39, BAD guy list-0
10-03-2008 06:38 PM
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

AGRAV8,

So your running 92/13 gearing? Thanks for the info.

I guess if I ever figure out how to get this GV-1 going it will tell me the RPMs the motor is running. Mine feels pretty peppy right now but I'm running a poorly programed v curve that isn't finished/set correctly yet. I had a tail servo fail was the first crash and the tail pitch slider bolt came loose for the second crash, dam vibration got me before I got it! Got the parts today and the tail control rod was broken in the box, the boom supports bent like bananas and so was the flybar. So it's going to be next week before shes up and flying again.

Tom

I'm married so you know I am no stranger to pain!
10-03-2008 10:05 PM
 
 
jetfixrguy
Veteran
Location: Valparaiso, Indiana USA

are these ratios too much for stock 231 w/ 710mm blades?
92t main 12t pinion = 7.67
92t main 11t pinion = 8.36

Pretend you're smart: use quotes.
10-03-2008 11:03 PM
HOMEPAGE  
 
 
litespeed600
Veteran
Location: St. Charles, Missouri

Assuming we are running our 231's at 12,500 rpm gives us a head speed of 1629 with the 7.67 and 1495 on the 8.36 . This would prolly be great with 810 mains?!?!

I think it would make you heli kinda lathargic but it won't sound like it.

kinda like running a car in first gear at 55 mph, if it could.

According to AGRAV8 7.xx to 1 is about the lowest you would want with a 6.28 to 1 being the highest on the stock 231.

That is what I have taken out of all the reading I have done in the past year of being a gasser owner/flyer.

Tom

I'm married so you know I am no stranger to pain!
10-03-2008 11:10 PM
 
 
jetfixrguy
Veteran
Location: Valparaiso, Indiana USA

ok, thank you Tom!

Pretend you're smart: use quotes.
10-04-2008 12:55 AM
HOMEPAGE  
 
 
jetfixrguy
Veteran
Location: Valparaiso, Indiana USA



Pretend you're smart: use quotes.
10-04-2008 12:58 AM
HOMEPAGE  
 
 
oldfart
Elite Veteran
Location: Vancouver, Canada

My stock Predator GS uses a 6.28/1 ratio. My GV-1 set for a sweet 1900 head speed on my RT710 3D blades has the engine singing at a hair under 12,000 (1900 x 6.28 = 11,932)

Don't y'all love the growl of a G231 when it is loaded - sounds like a big block V8 accelerating
10-04-2008 02:12 AM
 
 
jetfixrguy
Veteran
Location: Valparaiso, Indiana USA

Quote 
My stock Predator GS uses a 6.28/1 ratio. My GV-1 set for a sweet 1900 head speed on my RT710 3D blades has the engine singing at a hair under 12,000 (1900 x 6.28 = 11,932)

Don't y'all love the growl of a G231 when it is loaded - sounds like a big block V8 accelerating
How much different would a 6.43 be? same 231 engine and 710 blades? what should be a great target headspeed to run.

Pretend you're smart: use quotes.
10-04-2008 02:20 AM
HOMEPAGE  
 
 
jschenck
Elite Veteran
Location: La Vista, NE.

12,500 / 6.43 = 1944 < -- Headspeed to be at the peak of the 231PUH at this gear ratio

I changed my stock gears (88/14 = 6.28) to at 13T pinion (88/13 = 6.77) . My almost 5 gallons this summer left me with the impression that 6.28 is too steep for my style of flying where I'm throwing the heli around a bit without the magic touch of a skilled and practiced pilot. So I'm going higher gears to help recover the bogs a bit faster. But I think that the stock gears work great for typical sport flying and even aerobatics that don't involve big collective changes such as tic-toc's. The Hanson-26 handles my tic-toc's but it was bogging and having to really hunker down to pull through them after 3-4. This is where the 6.7 gears are to help, at least it's my intention. I found that I liked the 1900 headspeed so this will also raise my engine speed to where peak power is (1900 * 6.77 = 12,800)

...yep...
10-04-2008 02:59 AM
 
 
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Gasser Model RC Helicopters > Predator gear ratio.
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