Author Topic: Getting a gummy OS FP .35 ready to crank (Read 1316 times)

RknRusty · « **on:** October 26, 2013, 08:36:25 PM »

I got a couple of hand-me-downs, one of which is a Skyray with an OS .35. It was gummy and somewhat stiff, so I flushed it with alcohol through the venturi and exhaust, and behind the drive plate. After a few turns it loosened up and I shook it out and drenched it with air tool oil. Now it feels fine, but I wanted to ask before I crank it if there's any reason I should un-mount it and open it up first. I've never had an OS before, so I don't want to carelessly slag it. Anything like the Fox-stuck con rod and wrist pin to worry about? Anything else?
Thanks,
Rusty

Brett Buck · « **Reply #1 on:** October 26, 2013, 08:48:21 PM »

No real reason to mess with it. Just fire it up, debug from there.

RknRusty · « **Reply #2 on:** October 26, 2013, 08:58:27 PM »

Thanks, Brett. I'll kick the tires and light the fire.

Tim Wescott · « **Reply #3 on:** October 26, 2013, 09:00:10 PM »

Given that a Skyray is happy on an FP-20 or LA-25, I think an FP-35 is going to be more than a bit much.

But it'll be a good way to test the engine out.

RknRusty · « **Reply #4 on:** October 26, 2013, 09:13:43 PM »

Quote from: Tim Wescott on October 26, 2013, 09:00:10 PM

Given that a Skyray is happy on an FP-20 or LA-25, I think an FP-35 is going to be more than a bit much.

But it'll be a good way to test the engine out.

I guess I could use the TT Pro .25 from my Shoestring. But the OS is bolted up now, so I'll test fly it like that.

Steve Helmick · « **Reply #5 on:** October 26, 2013, 11:01:59 PM »

Quote from: RknRusty on October 26, 2013, 09:13:43 PM

I guess I could use the TT Pro .25 from my Shoestring. But the OS is bolted up now, so I'll test fly it like that.

That should be good for a grin or six!

Steve

Brett Buck · « **Reply #6 on:** October 26, 2013, 11:51:10 PM »

Quote from: Tim Wescott on October 26, 2013, 09:00:10 PM

Given that a Skyray is happy on an FP-20 or LA-25, I think an FP-35 is going to be more than a bit much.

But it'll be a good way to test the engine out.

There's a much better chance of an acceptable run with the 35 than there is with the 40. I was able to run my iron-liner 35FP in a reliable 4-2 break and with low pitch/high rev. I put it in place of my ST46, and it was not clear which was better. Bob would have liked it, it was 630 square inches and 46 ounces.

Brett

RknRusty · « **Reply #7 on:** October 28, 2013, 08:15:35 PM »

The Skyray flew great with the aforementioned fp.35 engine. It took me three flights to realize it only needs two choke turns to prime it. I was used to that Thunder Tiger on my Shoestring needing about 10 turns. It was choked alright. It cranks very easily, and the run is superb from beginning to end. I set it up with a Dubro clunk uniflow with muffler pressure and it drank every drop and never wavered. I'm hooked on that system now.

Speaking of hooked, after flying the Skyray, I'm not nearly as poor a pilot as I appeared to be with the SS. About 4.9 sec. with an 11x4.5 prop that was on the engine when Ray gave it to me. I'll probably try a 10x4 next time since the 11" is too close to the ground. I did not run it with a noticeable 4-2 break, just a little rich. Most of my previously unshapely problems came out beautifully. I've never felt a pull on the lines like that. I wish May came tomorrow.

Rusty

Author Topic: Getting a gummy OS FP .35 ready to crank (Read 1316 times)

RknRusty

Getting a gummy OS FP .35 ready to crank

Brett Buck

Re: Getting a gummy OS FP .35 ready to crank

RknRusty

Re: Getting a gummy OS FP .35 ready to crank

Tim Wescott

Re: Getting a gummy OS FP .35 ready to crank

RknRusty

Re: Getting a gummy OS FP .35 ready to crank

Steve Helmick

Re: Getting a gummy OS FP .35 ready to crank

Brett Buck

Re: Getting a gummy OS FP .35 ready to crank

RknRusty

Re: Getting a gummy OS FP .35 ready to crank