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Post  RknRusty Tue Mar 24, 2015 6:55 pm

The spraybar was bent pretty badly from gopher hunting on a crappy old airplane. I took the one out of my 35fp and it was a little bent, but not bad enough to worry about. It had ridden my old Ray Copeland Skyray into the bog at Watt's field up to the wings... which exploded, by the way. Anyway, I forgot to check the position of the single spray hole, so I installed it pointing straight back, just at the point where it's not visible. So my question is, izzat about right?

I expect to fly it next week. If you missed it and are interested, I posted a progress report Sunday, I think.
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Post  pkrankow Tue Mar 24, 2015 8:38 pm

Should be fine. As long as the hole is not visible the engine will run with adequate performance. I doubt you need to get every bit out of it, just a nice consistent run. "Bench" a tank or two through it before flying it. If it is funny it is an easy fix to aim it differently.

Something I noticed about the OS spray bars I have, the hole lines up exactly with a flat! If it has a lozenge shape on the one end then it is even easier. (ok, my sample size is small, like 3 parts, but I am confident it is correct.)

Phil
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Post  RknRusty Tue Mar 24, 2015 8:54 pm

I agree, it shouldn't be critical, probably only makes a difference in the needle's happy spot. And, right, most spraybars have a flat on the hex that lines up with the hole. I always mark it with a red sharpie before I start installing.
Rusty

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Post  Cribbs74 Tue Mar 24, 2015 9:45 pm

On single holes I usually point them them straight down. Sounds like you are about there anyway.
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Post  GallopingGhostler Tue Mar 24, 2015 10:35 pm

There was an article somewhere by one of the engine gurus, who described the optimum location of the spray bar hole. Suction is strongest when rotated from straight down something like 15 degrees from center. I've seen that recommendation in other places, too. Just wish I could find where referred to.
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Post  RknRusty Tue Mar 24, 2015 10:49 pm

@Cribbs74 wrote:On single holes I usually point them them straight down. Sounds like you are about there anyway.
Yes, given the tilt of the venturi, I'm about 25 degrees off. I guess I should bench run it as Phil suggested. Probably ought to take a look inside in case of dirt too. I know one thing, these FPs are tough little buggers. I've also heard the they are not nearly as loving as the smaller ones. The 35 is amazing, always a 1-2 flip engine, the 25 is almost as cooperative.

All of which reminds me I have today's flight report to file. Guess I'll get to it tomorrow. It was a great day at the field, cloudless, mid 70s, 5mph wind, tops, blowing away from the sun.
Okay, one pic, them you gotta wait til tomorrow.
Flight of the .40 Ukey
My Oriental's OS 40fp spraybar Ukey%20flight_zpsvutzefaf

Hey George, Thanks. You posted that while I was writing and arraigning pictures.
Rusty

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Post  Ken Cook Wed Mar 25, 2015 3:18 am

Align your spray bar hole to the same angle as the venturi stack.  Unlike the POS Fox spraybar the Fp isn't generally as fussy. What it is fussy about is the o-ring under the venturi. Seeing that it's been in the engine for some time, it's more than likely compressed. You really should require a lot of thumb pressure to squeeze it down to install the spraybar. If not, this sometimes requires you to double them up. When they do come loose over time and from vibration, the through hole can become egged out in the venturi. When the case gets hot problems can develop.

George, Bob Zambelli wrote an article in Stunt News in regards to what you read. It's been passed around many times through other forums. Ken
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Post  RknRusty Wed Mar 25, 2015 3:53 am

Hi Ken. Thanks for the position info. I thought about the o-ring when I saw how thin it was, so I left it in place and added a Norvel gasket. It was hard to get on, but then I had to use my 14" channel locks to compress it enough to get the spraybar in place. That ought to do it.
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Post  GallopingGhostler Wed Mar 25, 2015 10:33 am

@Ken Cook wrote:Align your spray bar hole to the same angle as the venturi stack.  Unlike the POS Fox spraybar the Fp isn't generally as fussy.
Interestingly enough, Ken, Horace Cain recommended replacing the Fox double hole spraybar with a single hole NVA from Enya, OS, and etc. This would help it to run more consistently and solved burping problems during stunts.

George, Bob Zambelli wrote an article in Stunt News in regards to what you read. It's been passed around many times through other forums. Ken
Ok, thanks, just couldn't recall but the explanation made sense, had to do with the airflow around the spraybar that suction was stronger if canted slightly away from bottom center in relation to venturi stack airflow direction, something like 15 degrees. So far, seems the McCoy's, OS FP and Enyas haven't been that fussy if pointed directly down in relation to venturi air path. I suppose with some engines, that if one had some fussiness, could rotate slightly to see if that improves performance in varying stunt positions. I've started doing that, seeing it did not harm and if improves reliability, I had nothing to lose and all to gain.
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