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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Smoked an OS .50 - need advice!
03-14-2003 01:41 AM  14 years agoPost 21
Indrid

rrKey Veteran

Hamburg, NY

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actually i think that is why the OS engines are more powerful than the TT... they use lighter parts. i havent heard of any blown pistons/conrods on TT engines, but i have heard they dont give as much power as OS engines. honestly, i think everyone here agrees that stability in an engine is a lot better than a little bit faster climbout.

1+1 usually=2

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03-15-2003 04:36 AM  14 years agoPost 22
jimmyhua

rrVeteran

Guam

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The purpose of loading the engine was to verify proper governor operation and mixture under load. The problem is that I didn't have enough time to do that!

By the way - how do you set mixture on these things? Before this heli, I have always flown airplanes with four strokes and I would use a tach to set the mixture properly. The problem with my heli is that I'm way too afraid to get anywhere near the thing when it's running to make any adjustments.

Hey rdoupe, just an FYI. Although alot of people will disagree with me, BUT the "proper" way to load the engine is in the air. Also, you won't know if the governor is working properly when strapping the heli down, there'd be so much resistance on the blades that you could bog that engine down even if the engine was tuned properly.

Setting the mixture on helis is a true art. I go by the sound. If it sounds, rich you get this gurgling sound. If it is just right, the engine sounds pretty smooth. If the engine starts to lean out, it starts to sound harsh again, but when slightly lean, it sounds quite smooth (smoother than the just right setting).

Some guys go by the temperature reading of the engine, and shoot for 220F. Have you ever heard of the spit test? Fly your heli around, land, and then spit on the head of the engine while the engine is still idling. If your spit sizzle, you are too hot! A few drops of water works just as good and doesn't look quite as gross.

Finally, we all like to compare needle settings. If you are far off from someone else, and they use the same fuel and muffler, then either you're way off or they are.

Jimmy

Finally, I think you should send that engine in anyways. Many times, OS will sell you a replacement engine at reduced cost even if it was your fault. Just explain to them what happened. Fact is, the piston heads of the OS50SX and OS70s are weak, so stop using that piston locking tool

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03-22-2003 12:30 AM  14 years agoPost 23
rcadd1ct

rrElite Veteran

Richardson, Texas

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You really should be using heli fuel also.

If I read correctly you are using plank fuel. Heli fuel has more oil and of a different blend than plank fuel.

The heli blend of fuel helps as the engine will be at a higher RPM longer than a plank without the major cooling effect of a big prop.

I run heli fuel for everything I fly. You don't need a smoke system when you fly 30% heli in a plane!

-RCA .......... Making Cuisinarts Fly!!!!!!!

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03-23-2003 03:13 PM  14 years agoPost 24
jimmyhua

rrVeteran

Guam

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Ha!

Yeah, if you are using CoolPower, you don't need no stinkin' smoke system

As far as I know, the only difference between airplane fuel and heli fuel is

1) cost
2) type of oils used.

CoolPower is 100% synthetic oil. If you run it too lean, the engine doesn't turn black from the castor turning into tar.

My Powermaster 10% uses a castor/synth blend. When I run too lean, I know. The glo plug looks bad (heck the whole engine looks bad). All it takes is one minute of lean running too.

Both of these use 18% oil as far as I know. Also, as far as I know, there ain't a superior synth oil out their that is as cheap as castor. And, no Coolpower doesn't use this superior synth oil, I think they use Klotz.

If you want 20% or more oil in your fuel, you either add it in yourself, or you're buying YS 20/20 mix.

Besides, PowerMaster 10% airplane fuel is cheaper! Works great on my planes too You're right though, it maybe the reason why I am able to BOG my OS50SX engine if I strap the heli down

Also everyone is able to tell I have abused my engine more than once, as my Muscle Pipe is black! I tell you! It wasn't my fault, the high speed needle was quite literally moving on it's own while the heli was in flight!

Jimmy

P.S. EERrrmm Umm. What I meant to say was. I really do think that rdoupe was in fact using Coolpower.

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03-23-2003 05:59 PM  14 years agoPost 25
rdoupe

rrNovice

Long Beach, CA.

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I was using PowerMaster YS 20/20 on the OS 50 that blew up. I had the main needle out almost 2 turns and I never touched the low speed needle. Now I'm on my second OS 50 and I've gone through about three gallons of fuel without any engine trouble! I can't believe how fast the tank becomes empty... Three gallons of fuel would last me at least two months with my airplanes (all four strokes). I need to win the lottery just to pay for all the fuel the heli needs!

I would like to get 15 / 25% all synthetic fuel if I could...

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03-23-2003 08:30 PM  14 years agoPost 26
Geo

rrApprentice

Australia

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OS50 Cooling Issues

Yes its got a head as big as a TT39
Not enough
Just bolt a big black heatsink on the existing head and you can lean it out and get your good fuel consumption
It works on the 46
Has to be Anodized Black And Segmented
Augmented Fins
Its well proven in heatsinks
It hasnt got to Helis yet
I dont know why ?

Geo

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › Smoked an OS .50 - need advice!
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