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HelicopterEngines Plugs Mufflers Fuel › Need help with an OS 70
12-12-2004 02:44 AM  13 years agoPost 1
Wa11banger

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Huntsville, Al

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Hello fellow RR members,

I have a question about tuning an OS 70. The problem I am having is indicative of a fuel problem but I have been completely through the plumbing twice now. The engine runs extremely well as long as the heli is upright. If I flip it over it will lose headspeed until it quits running. (yes I am fully configured in Idle up for those who would point this out ) Is there anything in the three needle carb that could cause this?

Like stated above first thing I thought was a fuel feed issue even though it runs great right side up. I have already isolated the header and the main fuel cell it does it on both although a thorough test on the 2 oz header tank was barely achievable. Both have been replumbed with new tubing twice. Filter was checked twice, all lines going and coming were replaced twice with tubing from two different packages.

This one has me by the shorties, please let me know your ideas

Thanks
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-12-2004 03:18 AM  13 years agoPost 2
m1ke1

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New Salem, Massachusetts

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What muffler are you using and fuel?
Definatly an interesting problem for sure.

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12-12-2004 04:40 AM  13 years agoPost 3
Wa11banger

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Huntsville, Al

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Running 1 week old CP 30% and the TT PV0205 for OS 60-70 motors

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-12-2004 06:21 AM  13 years agoPost 4
dkshema

rrMaster

Cedar Rapids, IA

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Is it quitting lean, or rich?

What heli?

Where's the center line of the needle valve in relation to the klunk? Higher than, lower than, in line with?

New heli setup, or one that has been working fine until recently?

Muffler on good and tight?

Any chance you've got a mechanical problem that when you are upside down, you're binding up the mechanics and it's just LOOKING like an engine problem?

Dave

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12-12-2004 07:02 AM  13 years agoPost 5
Wa11banger

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Huntsville, Al

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All new setup, Raptor 60 Airframe with the OS 70 engine. Center of carb is directly inline with clunk lines in tank and header tank. Engine bought used but new.. Didn't even have wear marks in it yet..

It's not binding all that was checked during setup, If I can bind it hard enough to stop the motor I think the links would pop But a good thought out of the norms.. I have run out of ideas.

Muffler on good and tight, Even sealed with High Temp RTV very little, so I no I dont have an obstruction.

It's plain weird, It has been running great upside right throughout its breakin period.. I just recently started leaning it out and trying to actually fly it mild 3d which is when I discovered it dont like inverted. When I flew planks that was an immediate heads up to clunk issues. But like I said have done that twice now which makes 3 different plumbing sets.

Thanks for all the hints to look for and the suggestions, I may have more info tomorrow I am going to take it back to the field and have Chuck wring it out and maybe he can tell help lead in a direction

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-12-2004 07:20 AM  13 years agoPost 6
Gearhead

rrMaster

Vt

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make sure 1 of your 2 clunks is NOT hanging-up on the back side of it's tank, I have seen this before, I have seen guys that had their in-tank fuel line to long and so their clunk would not drop down when inverted.

Jim

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12-12-2004 09:02 AM  13 years agoPost 7
Al Magaloff

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12,199 Posts- Enough Time Wasted. See Ya!

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Jim's thought is my first thought also. I would confirm the clunk line is not too long, and try UniFlo set-up. Are you sure there is nothing in the muffler that would compromise the pressure fitting hole?

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12-13-2004 02:38 AM  13 years agoPost 8
Wa11banger

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Huntsville, Al

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You all aren't going to believe this,, Glow plug... After rebuilding all my plumbing for the 4th at the field it finally happened.. I was inverted testing seemed to go ok then flame out inverted at 25ft

Actually was able to flip it over and auto in safely and what did I find that damn glowie hangin out in the canopy. Tightened it up and whalla all fixed..

Thanks for everyones support

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-13-2004 03:48 AM  13 years agoPost 9
dkshema

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Cedar Rapids, IA

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Lucky you -- found the problem after an inverted flame out, and your heli is still in one piece.

Dave

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12-13-2004 04:04 AM  13 years agoPost 10
Wa11banger

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Huntsville, Al

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Lucky is right.. when it flamed out I didn't even have to say it.. My wife did lol she literally yelled "OH S#!T!!! and I was thinking it.. Being that I made a grave error it is lucky to be alive.. I flipped out of inverted and pyro'ed back to flying forward.. I should have just rolled over and had a beautiful show of finesse and skill lol... But all is good afterward and she lives unscathed to try again another day.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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