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HomeAircraftHelicopterAlignOther › Headspeed for Trex 600n
02-08-2008 05:41 AM  10 years agoPost 1
pat_soccer_89

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Prescott Arizona - United States

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I was wondering if anyone can give me suggestions on what headspeed i should run on my trex 600n. I am currently running 1950 for idle 2. I am running an O.S. 50 Hyper with a pitch range of -11 0 11 i was wondering if 1950 is good or should i try 2000.

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02-08-2008 05:43 AM  10 years agoPost 2
george0079

rrElite Veteran

USA

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depends on your flying style... I run 1750,1950,2100

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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02-08-2008 05:44 AM  10 years agoPost 3
pat_soccer_89

rrNovice

Prescott Arizona - United States

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Headspeed
I am getting into extreme 3D 2100 isnt to high for the engine.

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02-08-2008 05:45 AM  10 years agoPost 4
baddynergy

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sierra madre, ca- usa

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2000rpm with the hyper and trex gears puts you right at peak power.

EDIT, Bump it up to 2050 and see if you like it. Its all up to you. I will tell you one thing I know, much over that and you will start seeing alot more wear on the bird and the hyper..ie bearings.

**Unattended children will be givin a shot of espresso and a puppy**

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02-08-2008 05:58 AM  10 years agoPost 5
Rockohaulic

rrElite Veteran

Canyon Country, CA, USA, 3rd Rock from the Sun

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+/-11 is a bit low for this bird. Try 12 or 13. That should wake it up.

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

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02-08-2008 07:01 AM  10 years agoPost 6
Jay1

rrVeteran

Colorado Springs

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2000 hs seems to be the sweet spot for most. I run 1950 and 2000 hs with about +/- 13-14 pitch.

Jay
Sooner or later, Gravity will win!

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02-08-2008 07:21 AM  10 years agoPost 7
Sam2b

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Tacoma, WA

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2200RPM is a definite sweet spot for my OS50 Hyper with the Align muffler (or hatori muffler). I'm running a more rich setting, and tuned my multigov to be very aggressive, +-14 pitch, and makes some awesome power in the air. The evidence is perpetual tictoks.

_Sam B_

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02-08-2008 03:37 PM  10 years agoPost 8
turbo35

rrApprentice

Southern Ohio

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Im flying idle1 @ 1950 and idle2 @ 2150 seems to work well for my OS50 Hyper and Align pipe.

BEAM TEAM USA

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02-08-2008 04:42 PM  10 years agoPost 9
S76 Mech

rrElite Veteran

Hatboro, Pa.

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Yup, my setup has a ton of power!

hyper
Align pipe
curtis 30% slightly rich
2150 h/s with metal grips

Has alot of punch!

Gaui Greatness X7, X5, NX4, X3

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02-09-2008 01:49 AM  10 years agoPost 10
baddynergy

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sierra madre, ca- usa

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Big question for all you guys running over 2050 rpm on the head( more for the guys at 2100 and above). How often to you have to replace rear bearings on the Hyper?

**Unattended children will be givin a shot of espresso and a puppy**

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02-09-2008 02:10 AM  10 years agoPost 11
Sam2b

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Tacoma, WA

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Roughly 150 flights. I inspect every 50 flights.

_Sam B_

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02-09-2008 02:34 AM  10 years agoPost 12
baddynergy

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sierra madre, ca- usa

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2000rpm for me. Peak power of hyper is @17000 and 8.5-1 gear ratio=2000head speed. 38 gallons and stock bearings. I am just trying to conduct a poll as to how many hypers fry their bearings because of extremely high headspeeds.

**Unattended children will be givin a shot of espresso and a puppy**

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02-09-2008 03:12 AM  10 years agoPost 13
dva

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Maricopa, AZ

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Are you sure the Hyper generates maximum power at 17000 rpm. Did you dyno your engine?

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02-09-2008 03:18 AM  10 years agoPost 14
baddynergy

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sierra madre, ca- usa

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Are you sure the Hyper generates maximum power at 17000 rpm. Did you dyno your engine?
Yup, I am sure where it develops its power.

Straight from the Os website
SPECIFICATIONS
Stock Number: OSMG1951
Displacement: 0.499 cu in (8.17 cc)
Bore: 0.866 in (22 mm)
Stroke: 0.847 in (21.5 mm)
Practical rpm: 2,000-20,000
Output:1.9 hp @ 17,000 rpm
Weight: 14.3 oz (406 g)
Includes: 60LH carburetor, #8 glow plug
Requires: muffler, drive hub
15550 50SX-H Ring Hyper Parts Listing

The owners manual also lists this info.

No need to, Os did it for us. With the exception of minor differences in pipes, it is pretty accurate.

**Unattended children will be givin a shot of espresso and a puppy**

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02-09-2008 03:42 AM  10 years agoPost 15
dva

rrNovice

Maricopa, AZ

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OS did all the work? Do you want to put any money on that? Most of these powers listed by model engine manufactures are calculated using thermodynamic calculations, not a dyno. If they did many engine manufactures would supply some type of torque curve. Nowhere does it say to run the engine at 17000 rpm, or this is the max power or torque. If the engine generates the maximum torque at 17000 rpm it would be good to run the engine above 17000 rpm so when the engine is loaded the torque is increases as the head speed drops.

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02-09-2008 03:47 AM  10 years agoPost 16
baddynergy

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sierra madre, ca- usa

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Practical rpm: 2,000-20,000
Output:1.9 hp @ 17,000 rpm

OUTPUT 1.9@17000 That is not where Os is saying peak power is?? If it isn't wouldn't they supply another number elsewhere? And it does say 1.9HP. HP-horsepower
2 stroke engines dont have alot of torque, its mostly Hp. The pipes we use just broadens or narrows the range power is produced.
And yes I would put money that peak power is pretty close to what Os says. Find a dyno small enough and I will supply the engine.

So when ford says there 5.4 supercharged motor puts out 525hp@5200rpm(figurative here) you are going to say they did no testing?? And then ask them for a dyno sheet?

go here read this, it says where peak power is and where it falls off. They are comparing the TT redline to the hyper.

http://www.infinity-hobby.com/main/...DLINE53/001.jpg

**Unattended children will be givin a shot of espresso and a puppy**

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02-09-2008 04:00 AM  10 years agoPost 17
dva

rrNovice

Maricopa, AZ

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I flew CL speed back in the day and built a Dyno with a friend. From my experience with two stroke engines the output varies greatly engine to engine due to tolerances that come from the manufacturing process. I would not just say 17000 rpm is best and run no higher. I would fly engine and find where it runs the best for your type of flying.

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02-09-2008 04:06 AM  10 years agoPost 18
baddynergy

rrElite Veteran

sierra madre, ca- usa

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I am not saying it is best either, what I am saying is peak power is at 17000rpm. And like I said in another post here, I am trying to do a poll on how many hypers fry the rear bearing due to excessive headspeed. But also coming from an extensive racing background, I know when a 2 stroke is overrevved, they fall flat on their face and bog excessivly.

I have also found in my experience around helis, that high head speed hides bad collective management skills..

flame suit on

**Unattended children will be givin a shot of espresso and a puppy**

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02-09-2008 04:11 AM  10 years agoPost 19
Sam2b

rrElite Veteran

Tacoma, WA

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Comment: I don't know how to explain my situation, but since my new mixture, pipe, and gov settings, my OS50 Hyper is a new engine @ 2200rpm. Proof is in the sky. I wish I could capture a video of it. I must say: very interesting off topic information. I'm intrigued.

_Sam B_

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02-09-2008 04:16 AM  10 years agoPost 20
baddynergy

rrElite Veteran

sierra madre, ca- usa

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We have gone a little off topic huh. Look up frestyle 3d class with Todd Bennet, The KING of SMOOTH flying. I guess I associate my style as trying to emulate his. IMHO anyone can bang a heli around with a 2100 or higher headspeed but can you do it at 1800?? I can.. And one of my hypers is reaching the 40 gallon mark with the original bearings, the other is at 20 gallons..

**Unattended children will be givin a shot of espresso and a puppy**

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