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HelicopterEngines Plugs Mufflers Fuel › New os hyper 50 getting me frustrated
11-22-2006 12:48 AM  11 years agoPost 1
LARKS

rrApprentice

Lake Charles, Louisiana

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I bought a new hyper for my evo after I fried the old one. I have to set the main needle at 2.5 turns from closed to get it to run smoothe in idle up. Any leaner and it will stumble and shake the tail while flying around. Hovering is fine though. I broke it in with a gallon of 30% nitro wildcat fuel. Anyone have any ideas?

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11-22-2006 12:55 AM  11 years agoPost 2
TonyTypeS

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New Orleans, LA & El Monte, CA

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2.5 turns out is a lil rich. Any where from 2 turns to 1 3/4 is good. Which glow plug are you using?

Maybe you could have something stuck in the carb. Try to flush it out.

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11-22-2006 05:26 AM  11 years agoPost 3
jschenck

rrProfessor

La Vista, NE.

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What is your low end set to? I run around 12:30-1:00 o'clock for initial break-in, just lean enough to let it idle and spool up without stumbling too much.

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11-22-2006 12:49 PM  11 years agoPost 4
LARKS

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Lake Charles, Louisiana

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Im using an os 8 plug, it came with the engine. The low end needle is perpendicular with the main shaft at the factory setting. I had to richen it up slightly as it is very difficult to start if I try to lean it more and will make a dirt bike type buzzing sound on landing.

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11-22-2006 01:18 PM  11 years agoPost 5
jschenck

rrProfessor

La Vista, NE.

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The low end needs to be perpendicular to the CARB not the main shaft or crank shaft. To run properly I usually start about 12:30-1:00pm from there and a little more than two turns out. Keep an eye on the temps as it breaks in.

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11-22-2006 03:29 PM  11 years agoPost 6
BarracudaHockey

rrMaster

Jacksonville FL

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Thats a VERY rich needle setting for a hyper, even with 30 percent fuel, have you checked your fuel filter and replaced your clunk lines lately and make sure the head bolts were tight before you installed it? Also check that the carb is seated correctly.

Andy
AMA 77227
http://www.jaxrc.com

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11-23-2006 01:00 AM  11 years agoPost 7
LARKS

rrApprentice

Lake Charles, Louisiana

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This is strange. Its seems a though the tail wagging a surging only happens in idle up with a head speed of 1950. Maby I should lower it to 1850? I trid leaning it to 2 turns but it gets very hot at the backplate. Changing all the fuel lines and klunk line didnt seem to help either.

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11-23-2006 01:35 AM  11 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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I bought a new hyper for my evo after I fried the old one.
Any leaner and it will stumble and shake the tail while flying around. Hovering is fine though.
I hate to ask, but how did you fry the first one? Perhaps it's time you found a local flyer who can help you and teach you how to tune the engine before you go ahead and fry a second one. That's going to get expensive.

Stumbling and shaking is an indication that you're running way to rich. If you have the 50 manual, open it up and read the tuning instructions, and try to understand them. The put your new knowledge to work.

There are two fuel metering adjustments on your carb. One works on the low end, the other the top end, and when tuned correctly, they both make for a good mid range. Either one being set incorrectly will cause nothing but grief and lead to fried motors.

Dave

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11-23-2006 01:39 AM  11 years agoPost 9
Gary Jenkins

rrElite Veteran

Nowhere, US

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Are you using a govenor? Does the engine run fine in normal mode? If so what is the difference in your setup between the two modes.

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11-23-2006 02:03 AM  11 years agoPost 10
LARKS

rrApprentice

Lake Charles, Louisiana

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Using a futaba GV1:

Normal: rpm= 1750 pitch=-6,5,11
Idle up: rpm=1950(too high??) pitch=-11,0,11

using a curtis mp2 and wild cat 30% fuel.

low end is slightly rich of the factory setting.
It flys fine in normal but the problems start when the rpms go up.

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11-23-2006 02:24 AM  11 years agoPost 11
Jafa

rrElite Veteran

Sydney, Australia

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The 30% nitro could be the reason for the rich needle
But it would pay to disassemble and clean the carb out

Otherwise, I think you need hands on help woth this one.

I also think a Enya 3 may be a better bet for 30% nitro

1950 rpm is about the sweet spot - as is +/- 11 degrees


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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11-23-2006 03:11 AM  11 years agoPost 12
ckoelliker

rrElite Veteran

St. Simons, GA

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Check to see if the carb is seated as stated above. It says in the Manuel that you will need to adjust it.

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11-24-2006 12:01 AM  11 years agoPost 13
LARKS

rrApprentice

Lake Charles, Louisiana

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Identified the problem

Just got back from the field and found that the engine will only get hot when running the 30 fuel. Went back to 15% and but the needle back at 1.5 turns and this was slightly rich of the optimum power stetting. Ended up at 1.2 turns. The instructions say to start at 1.5 turns out and adjust from there. Do they assume that the user is using fule with 15 or 10 percent nitro. I found this intial settting FAR too lean on 30 as it will die in a ten ft. hover!

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11-24-2006 03:35 AM  11 years agoPost 14
TonyTypeS

rrElite Veteran

New Orleans, LA & El Monte, CA

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Could be bad fuel

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11-24-2006 04:40 PM  11 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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"They" only give you a starting point for the needle settings, as those are dependent upon the fuel, altitude, the load, atmospheric conditions...

Higher nitro percentages require a richer setting on both needles. Lower nitro percentages require leaner settings. Adjust your engine accordingly.

Dave

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11-24-2006 06:06 PM  11 years agoPost 16
Simon - R

rrApprentice

uk

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perhaps you need to shim the head up like we do on the 91's .

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11-24-2006 08:15 PM  11 years agoPost 17
LARKS

rrApprentice

Lake Charles, Louisiana

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Higher nitro percentages require a richer setting on both needles. Lower nitro percentages require leaner settings. Adjust your engine accordingly.
Done that and ended up at 2.5 turns on the high end and the low end at 3:00

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11-24-2006 08:16 PM  11 years agoPost 18
LARKS

rrApprentice

Lake Charles, Louisiana

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perhaps you need to shim the head up like we do on the 91's
How many shims should be added?

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HelicopterEngines Plugs Mufflers Fuel › New os hyper 50 getting me frustrated
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