os 50 hyper

[avatar71]

please, is there a right answer....???

How hot do you let your backplate get on your hypers? I have heard "keep it cool to the touch" and "I can keep my finger on it for 10 or so seconds"

I have been keeping mine warm to the touch but I don't feel like I am getting all the power I should.

Should a +10/-10 raptor 50 slow (bog) down on full stick climbout? Or tail first flips? I realize that collective management may play a part here but, I still feel underpowered...

[DebianDog]

You should be able to hold your finger there a few seconds and not burn it. Hot but not -HOT-

What pipe do you have on it? What fuel you running? How much fuel has gone though it?

[BarracudaHockey]

Yep, cool enough for 3 or 4 seconds. Or get a Venom temp gauge and tune it for around 185 190 peak, thats not peak power, it will run over 200 but if you want to keep your motor happy that will give you a good compromise between power and longevety.

[avatar71]

I am running the stock TT pipe, 30% curtis fuel, and probably 1.5 gal thru.

So, do I have this right...

185 to 190 degrees at the backplate as soon as I land it?

[flyinfool]

Nooo.
That 185 is measured up near the head.
125 - 135 at the back plate is a good number in the summer time, a little less in the winter.
Get a better muffler and you will notice a lot more power.
I am running the Hatori JK Hyper. (http://www.gohbee.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=HAT-SB50HP&Category_Code=5000)
When I went to this new pipe I had to open the main needle almost a half turn over the stock muffler due to the reduced back pressure.

Setting the needle in cold weather is a little tricky because the engine cools so good with the cold air, by the time you get the temp up to "normal" your way to lean.

[DebianDog]

yep.

Get a better pipe man. A stock pipe on the Hyper blows chunks. You will have a whole new motor when you put a Muscle Pipe or Hatori on there. Promise. :wink:

[BarracudaHockey]

You also have to understand two things.

1. Max temp occurs under load, the temp starts dropping as you back off the throttle and bring it into a hover.
2. Wait too long and the metal crank case acts like a heat sink pulling the heat down and away from the head so if you wait the back plate may be hotter than if you land right away and go touch it.

Same applies for using a temp gun, you have to add 10 or 15 degrees to figure out your max temp in flight.

[avatar71]

ok. so 120 @ the back plate wintertime?

[vandelescrow]

I am running the OS hyper 50 with a Curtis muscle pipe, using cool power 30 in a Raptor. I am not good with tuning engines so I asked the local guru and he said you don’t go by the temperature, you go by how it sounds. Start rich and if it sounds like it is spitting or you see unburnt fuel drip from the pipe, lean it out a few clicks.

He would hover the heli nose in and do a climb out angling backward, away from him. This way he can hear the engine better vs. hearing exhaust. Then he would bring it back down listening to see if it took to long for the engines rpm’s to drop (to lean)

I don’t have the ear for it but when he got done tuning it, the engine’s back plate was only warm. I thought it was actually to cold but he said you don’t go by that. He must know what he is talking about; he is one of the top FAI pilots.

Hope this helps

[flyinfool]

Ideally that is how you tune the engine.
But for someone that does not have the ear developed yet you still need other methods to get in the ballpark.

[DebianDog]

Yep if it is running right, has enough power, and is not burning you fingers off it is good baby! :smokin:

[ozbach]

Thats the way I tune my engines...I start out by going too rich! then do some climb outs, go a few clicks at a time leaner, repeat until, the engine starts too sound cleaner. then stop there, you want to be at the point to where it runs good just a bit past the too rich point!...of course you could get a little more power going leaner, but if you want it too last, it needs plenty of fuel going through it for lubrication. Remember your fuel passes through your bearings first before reaching the combustion chamber.

[Eric O.]

I'm still a little confused when to turn the Low End Screw and High End Needle. I'm running with the 3D 522 Hatori and a Kasama Fan which makes checking temperature a little less accurate cos the K.Fan really cools it down well?? What sounds am i supposed to listen form??

[BarracudaHockey]

http://www.raptortechnique.com has two great articles on engine tuning, they apply to any 2c heli

[Eric O.]

Thanks mate. I will check it out. Are there any Instruction Videos abt Engine Maintenance and Tuning, like the ones Finless Bob does for the TRex out there??