Partial Power Loss After Hover Is Established

[drmda]

I just got my Nexus 30 Standard out of mothballs and got it hovering again. (That's all I've ever done without crashing.)
I cleaned the OS .32 SX and now it starts well and it seemed to function properly. I have good power and can get into a hover easily.

However, I get a partial power loss after hovering 1-2 minutes? Slowly I lose power and the heli settles back to the ground slowly or will only hover in ground effect. Once it has settled, if I lower the throttle I get increased RPM as the pitch is decreased. If I let it idle 15-30 seconds it gets some of it's power back for a short period.

What is happening?

Thanks in advance.

Bob

[WayneBrown]

This sounds like a classic fuel flow, or pressure problem.
Have you replaced the clunk line, and all fuel lines yet?

[Hotshot Charlie]

Yep, Wayne's got it, clunk lines collapsing and causing the motor to go lean. I would pull the tank and replace all the lines. That will probably solve your problem.

[drmda]

This sounds like a classic fuel flow, or pressure problem.
Have you replaced the clunk line, and all fuel lines yet?

LameBird and Hotshot Charlie, I haven't done that. I'll certainly replace those old fuel lines.

Thank you for your help.

Bob

[kovedawg]

Another possibility is that your engine is getting overheated. Had the same problem with my old Hawk IV/Webra 32. I bought it used and that engine never ran right. After a minute of hovering the engine would bog down until it cooled then it would fly again. Good luck

[drmda]

Another possibility is that your engine is getting overheated. Had the same problem with my old Hawk IV/Webra 32. I bought it used and that engine never ran right. After a minute of hovering the engine would bog down until it cooled then it would fly again. Good luck

I wonder if that is the problem. I haven't replaced the fuel lines yet, but I have the parts. If that doesn't fix it, overheating could be the problem. I've been flying in 90+ F heat.
What can I do to help cool it, besides forward flight? :?

Bob

[Hotshot Charlie]

The bad fuel lines will cause the leaning out, which causes overheating, which I would bet is your problem. It could be all related or it could be you just need to play with your tuning. Have fun and stay safe!

[tnreefguy]

The engine is running lean.

[WayneBrown]

lean = overheating.
hotter temps may require richer mixture, or higher nitro to internally cool the engine. A portion of engine cooling is via mechanical fan, the remainder is carried off with the unburnt oil. Synthetic oils carry some heat, but not as much as castor oil.

[drmda]

This sounds like a classic fuel flow, or pressure problem.
Have you replaced the clunk line, and all fuel lines yet?

THAT was my problem. Now my Nexus runs just fine. I put 2 tank-fulls through it and I had no problem with power, until the tank started getting really low, then it lost a little power, but kept flying.

Thank you, guys.

Bob

[Hotshot Charlie]

If you will add a "Header" tank, it will eliminate the problem when the fuel gets low in the main tank. Just quit flying when you get into the header tank.

Glad you got the problem solved !

[WayneBrown]

Glad to hear it!
Now go burn lots of fuel!! :D