RunRyder - O.S. 50 and muscle pipe

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Engines Plugs Mufflers Fuel > O.S. 50 and muscle pipe

S.Peterson
Heliman
Location: Sun Prairie, WI

Is anyone running this setup? What gear ratio, fuel, plug, header/pipe gap and head speed are you using.

I am trying to get my raptor 50 setup with 8.5:1 gear ratio, cp30, enya #3 and a 1/4" gap. I have about 1/2 gallon thru mine running rich for break in, and to keep the head rev's down because I had wood blades on it. I now have SAB 600's on it, so I am not so worried about the blades self destructing, and I can start to lean it out. I may also have to go back to the 9.6:1 gears.

Any feedback would be appreciated.

Thanks, Stu

04-03-2002 Over year old.

Hotwings
Key Veteran
Location: Florida, Port Charlotte and West Palm Bch.

mine is set up faactory raven 50, os50 cy muscle pipe, check out gold plated muscle pipe thread (runryder) it is fine stock cp 30% os #8 plug 1/8 gap with prather pipe connector. or 1039 blue conn that curtis y uses. c-ya

Please cancel my clearance, I have the field in sight.

04-03-2002 Over year old.

Michigan PI
Senior Heliman
Location: St Clair Shores, MI

Stu,
have someone with a tach help you set it up. Start out with the gap around 10mm or 3/8". Don't try to limit your headspeed with the throttle curve too much, let the pipe do it. Adjust the pipe for the desired headspeed, shorten it for a higher headspeed, lengthen it for a lower headspeed. Adjust your needle to keep it just on the rich side.
If you try to adjust the headspeed using just the throttle curve, it will emulate an improper needle setting. ie, if your headspeed is too low and you try to increase the throttle curve, your engine will emulate a rich condition. You will need to shorten the pipe.
If your headspeed is too high and you try to limit it with a lower throttle setting, you will notice the engine going lean in decents as the throttle closes. You will need to lengthen the pipe in this instance.
It may take a few tries to get the proper balance, but well worth the work.
Nothing sings like a properly tuned engine/pipe combo

Going back to a 9.56:1 ratio will suck a ton of fuel and cause you to have to shorten (cut) the header substantially to get a decent headspeed out of it.

04-03-2002 Over year old.

HOMEPAGE

Secret Squirrel
Key Veteran
Location: New Zealander living in Melbourne, Australia

OS 50 and Muscle Pipe

Hi guys,
I'm using a 60 size muscle pipe on my OS 50 in a JR Voyager.
The Voyager has the upgraded pinion bringing it to a 8.8:1 gear ratio.
I'm running 10% nitro.

The combination seems to sound good, but doesn't seem to have any more power than my mate's Voyager which is using a muffler.

Would I have to cut down my muscle pipe to get the power going???

To be fair, due to weather constraints, I've only had about 30 mins flying time on this so far.

Any help would be appreciated.

Regards,
Si

-------------
Simon Lockington

04-03-2002 Over year old.

HOMEPAGE

S.Peterson
Heliman
Location: Sun Prairie, WI

Hi Jeff, thanks for the tips. I don't have anyone to tach for me, but I think I can install a spare gv-1 I have and use the max rpm function to give me my rpm readings. I think this will work. If I don't engage the govoner, it will still store max rpm seen during the flight.

I will try the 3/8" gap and see how that works. What head speed are you getting with this gap?

Thanks, Stu

04-03-2002 Over year old.

sodflyer
Veteran
Location: Frederick Colorado

os and pipe combo

I like my OS 50 and CY combo, sofar I havent gotten it fully broken in yet only a few tanks...but it looks like a great combo so far!! It was however kind of a pain to install on the falcon due to bolting requirements...anyway I like it!

04-04-2002 Over year old.

Michigan PI
Senior Heliman
Location: St Clair Shores, MI

Stu,
The only reason I said to tach it is because with the 8.5:1 gearing, it's tough to guess by ear. At 3/8" if memory serves me, I was running 1650 give or take a few. I haven't had much of a chance to really get down to the brass tax and dial this in due to the weather and my work schedul. I shortened the pipe a little and I'm up near 1800 now (guessing) but I was alone and didn't have anyone to tach me. My target is 1950. I am running the TT50 with the Muscle Pipe and there shouldn't be a difference in pipe length for a given RPM. One thing for sure, it takes full pitch in both directions and flys like a missile!! Once the weather gets a little better I can catch someone at the field to tach it for me so I can finish the tweaking.
I am also working on a R30 with a Webra 35 and 8.5:1 gearing on a pipe. This engine hated the pipe (Helimax) on the 9.56:1 gearing, I'm hoping that I can get it tweaked in with the taller gears. With a muffler though it's a real performer.

04-04-2002 Over year old.

HOMEPAGE

S.Peterson
Heliman
Location: Sun Prairie, WI

Jeff, I would love to find someone else to fly with so I could use a tach, but nobody else in the area flys helis.

Yeah, I know what you mean about the available pitch. My headspeed just keeps increasing in a vertical climb, even running quite rich. I am going to have to limit my throttle travel once I get the motor broken in and get the needles set where I want them.

I ran a webra 35 on a full length weston genesis pipe last summer. With 9.6:1 gears and 5% fuel it was a rocket (for a 30). A really good crash (bent the crankcase and broke almost everything else) put an end to that set up.

Stu

04-04-2002 Over year old.

Michigan PI
Senior Heliman
Location: St Clair Shores, MI

It really did work out great as the 50 engines seem to get more out of it than the 60's! I'm sure it's due to the larger volume letting the engine breath better. I have always had good luck using the exhaust designed for the next size class up. They just look so big and bulky hanging off the side.

04-04-2002 Over year old.

HOMEPAGE

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Engines Plugs Mufflers Fuel > O.S. 50 and muscle pipe

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