Author Topic: Cox 1/2A engine question (Read 11609 times)

John Rist · « **Reply #50 on:** September 05, 2013, 05:55:09 PM »

Well my NV AMD 061CL is pretty much bench broken-in. I have 5-6 1 oz runs on it. I am running a Cox 5x3 3-blade. I still have the 3 head shims in place. She cranks along at 20500 RPMs for 3 minutes on 1 oz of 30% fuel.

At this point I may not change a thing. I was looking for a little more power. The TD was at around 16 - 18K. SO 21K should do the trick. I probably will try a 2 head shim set-up.

Flight report to come.

Phil Krankowski · « **Reply #51 on:** September 05, 2013, 08:04:50 PM »

I think I would try a larger diameter before I got off the bench. Put a flatish 6 inch on and see if you are still cranking 18k. Diameter can do awesome things to thrust and run time. (or not, but it won't hurt the engine to try it.)

I bought some 6-2 APC props to try on my teedees.

Phil

John Rist · « **Reply #52 on:** September 07, 2013, 09:14:10 AM »

Well the DO-335 with a Norvel 061 setup is ready for it's first test flight. The NV AMD 061CL with a Cox 5x3 3-blade, on 30% fuel is turning 20500 RPMs. The back engine, a TD 049 on a Cox 5x3 3-blade pusher and 30% fuel is turning 14000 RPMs. I still have 3 head shims in the AMD 061. But it runs so well that I will try it this way.

Monday is test flight day. Will report.

John Rist · « **Reply #53 on:** September 09, 2013, 06:31:25 PM »

It works!! The Norval AMD 061 has great power. The DO-335 is now a contender.

RknRusty · « **Reply #54 on:** September 09, 2013, 07:28:13 PM »

Quote from: John Rist on September 09, 2013, 06:31:25 PM

It works!! The Norval AMD 061 has great power. The DO-335 is now a contender.

Excellent! Fast and tight, I presume.

RknRusty · « **Reply #55 on:** November 12, 2013, 07:51:23 PM »

Hi John, I hope you don't mind me hogging your thread. Howard Shenton from MCLS, Metrolina Control Line Society asked to print my Reply #42 above about breaking in a Norvel engine in the club newsletter. And he also wanted to know about the fine thread NV I mentioned, so I figured it might as well all be in the same thread. So here is the link to my home made fine thread NV for Norvel engines:
http://www.rcgroups.com/forums/showthread.php?t=1863251

Howard, for saving pictures, click them about 3 times to get the full size versions.
John, thank's for letting me clutter your space.

Rusty

Author Topic: Cox 1/2A engine question (Read 11609 times)

John Rist

Re: Cox 1/2A engine question

Phil Krankowski

Re: Cox 1/2A engine question

John Rist

Re: Cox 1/2A engine question

John Rist

Re: Cox 1/2A engine question

RknRusty

Re: Cox 1/2A engine question

RknRusty

Re: Cox 1/2A engine question