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HelicopterEngines Plugs Mufflers Fuel › Eating glow plugs like candy
06-06-2012 03:54 PM  5 years agoPost 61
3DManA1

rrKey Veteran

Kansas City, Mo

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Change the fuel and plug. Use cool power 30% and os 8 plug.

Thunderbirds Rock and Roar

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06-08-2012 05:27 AM  5 years agoPost 62
HotsHabit

rrVeteran

Idaho

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Small update on my situation, I went out last Thursday after work and managed to get in 2 flights a piece on 2 of the machines, and then I caught a dam head cold and haven't been out since.

On the 50 hyper, I put in a brand new glow plug and I turned off the governor (multigov v2)and tuned the engine, set the throttle curve to 100-75-100. After that flight I turned the governor back on and dropped the head speed to 2100 rpm. Machine flew very well and didn't seem to have any issues. After the second flight I pulled the glow plug and it still looked new.

On the 55, I put in a brand new glow plug and I turned off the governor (multigov Pro)and tuned the engine, set the throttle curve to 100-70-100. I could not keep the engine from overspeeding through 0 degree range, changed throttle curve to 100-50-100 and all this time richening the mixture, still had a very hard time controlling the overspeed. Hooked the governor back up, changed the headspeed to 2100 and flew retuneing the engine from its "spitting raw fuel rich" position. After the second flight I pulled the glow plug and it still looked new.

I will be getting out this weekend to do a lot more testing and will report back on my findings. I suspect that TMoore and others were correct on me over taching the motor. The engines ran smoother and didnt exhibit any tailkicking. I am going to try to inch it up to 2150 after about 6 flights or so per machine to see if I can get away with that.

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06-08-2012 08:37 AM  5 years agoPost 63
rotor head33

rrApprentice

Louisiana-United States

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I'd say that was your problem. Also I always tune without gov for a baseline then kick the gov on and retune since its always spitting raw fuel when I kick the gov back on. I run a 1900 headspeed and love it. Keep us posted!!!

Power is nothing without control

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06-14-2012 10:26 PM  5 years agoPost 64
HotsHabit

rrVeteran

Idaho

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Another update, making progress and eliminating a few variables along the way.

Did a fuel change from Magnum 30% Heli plus to Cool Power 30%. The 55 ran the same on both fuels with the only difference being 3 clicks on the high speed needle. The glow plug still appears to be fine, and I took the head speed up to 2150 which I think is going to be the max it will be able to run. I think my main problem with the motor was simply too many rpm's on the motor at 2200 rpm head speed.

Did the same fuel change on the 50 with the new rebuild and it didn't make any difference at all except a few clicks on the high end needle. I am still getting inconsistent running from it. As long as I am pushing it hard it runs ok, but as soon as you back off from like pushing it hard to hover or inverted hover it starts kicking again. Its not rich or lean but it acts like it is jumping from one condition to the other. Temps are inline with what they should be. Dropping the head speed helped some but I am thinking it simply has too much compression after the new ring, piston, and liner. I pulled the motor out and added a shim and will see if that fixes the problem.

Synopsis so far is the fuel change had no bearing at all on the results so I will continue to run the Magnum 30%. The biggest change right now has been the reduction of the head speed that seems to pretty well solved the problems with the 55 motor, it is running dam good right now and consistent also. Will report back later on what the compression change does to the new rebuilt 50 and the other 50 will be coming online also as I got the repairs done from the power outage crash on the 3rd machine.

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06-14-2012 11:12 PM  5 years agoPost 65
rotor head33

rrApprentice

Louisiana-United States

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Congrats man. Glad to hear it is all coming along well

Power is nothing without control

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08-13-2012 06:30 AM  5 years agoPost 66
HotsHabit

rrVeteran

Idaho

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Another update on this situation.

OS 55: Problem solved on the 55 in the flybarless machine, too high of head speed and running too lean to achieve the higher head speed. Max head speed dropped to 2100 and the motor richened up and it hasn't eaten a glow plug in 2 gallons of fuel.

OS 50: this machine has been my problem child for about 2 years now, I have been chasing issues on this machine it seems non stop for a while. Long story short is the governor was bad. I am pretty embarrassed to admit to not being able to pinpoint it earlier as I did tune the motor and break it in without the governor on. Too high of headspeed along with a bad governor and some lean runs caused the problems here but its all good now.

Thanks for everyone's advice and help on my issues.

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08-20-2012 09:54 PM  5 years agoPost 67
praztek

rrApprentice

brandon , fl

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Hello,

I have noticed also my OS 55HZ " original bearings approx 60 flights " is going through plugs more often recently, since I've raised the headspeed.

Although, I'm not hearing any screaching sound, similiar to what I heared when they went bad in my retired OS 50.

Rotor Rage - 30% nitro
No rtv
Transition from idle is smooth
OS #8
Refill after every flight and clamp fuel line
Burn all the fuel out of the engine after last flight for the day
Backplate is warm to the touch, hot after 6 or so seconds, but running pretty efficiently.

Before I go the route of changing the bearings, will lower the headspeed from 2140 to 2100, and hope that will fix it.

If not, I already have a set stainless steel ones from boca.

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08-21-2012 12:36 AM  5 years agoPost 68
HotsHabit

rrVeteran

Idaho

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2100 rpm seems to be the magic number for me on the Raptor 50's running a gear ratio of 8.5:1. Your mileage may vary depending on what your gear ratio is.

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08-21-2012 12:55 AM  5 years agoPost 69
praztek

rrApprentice

brandon , fl

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Great ratio is 8:6:1, outrage velocity n2

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08-21-2012 01:04 AM  5 years agoPost 70
HotsHabit

rrVeteran

Idaho

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2100 rpm on 8.6:1 gear ratio gives you a motor rpm of 18060, which is just a touch past max rpm for this motor. 2050 would put you into a lot safer rpm at 17630 and probably take care of your plug problems. My motors seem to be happy with 17850 rpm.

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08-23-2012 01:44 PM  5 years agoPost 71
praztek

rrApprentice

brandon , fl

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Thanks for the info, decided to put in the new boca bearings. Waiting for the first flight.

Is there a proper break in procedure for the new bearings, would 1 tank with light flying in normal mode suffice ?

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08-23-2012 02:31 PM  5 years agoPost 72
HotsHabit

rrVeteran

Idaho

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No break in necessary for new bearings. I have the Magnum glide bearing in my motors, bearing changes are a thing of the past now.

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08-23-2012 02:51 PM  5 years agoPost 73
praztek

rrApprentice

brandon , fl

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Thanks for the info, and yeah, been reading up on the glide bearing setup. Very interesting.

I've never had any issues with the boca bearings, just the oem ones that come with the OS motors. Once switched out, I haven't had to replace , well over 100 flights.

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HelicopterEngines Plugs Mufflers Fuel › Eating glow plugs like candy
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