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Cox Engine of The Month
OS .40fp spraybar
Page 1 of 1
OS .40fp spraybar
Anyone know for sure if the .25fp through the .40fp all take the same NVand spraybar? Not necessarily the venturi, just wondering about the NVA. I have a bent spraybar on my .40 which I'll be needing for the Oriental.
Rusty
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
Re: OS .40fp spraybar
Yes, it fits for sure. The FP.20-.46 is the same needle valve assembly and venturi. The venturi though is smaller on the smaller mills. All will fit though. Pay careful attention to the rubber o-ring under the venturi, it might be compressed. If the spraybar slips through will little to no pressure, replace the o-ring. Ken
Ken Cook- Top Poster
- Posts : 5653
Join date : 2012-03-28
Location : pennsylvania
Re: OS .40fp spraybar
This is the one I have, with label and OS serial nr
Lieven
Lieven
OVERLORD- Diamond Member
- Posts : 1807
Join date : 2013-03-19
Age : 58
Location : Normandy, France
Re: OS .40fp spraybar
If you have the needle valve out of the plane and in front of you, I highly recommend removing the spring from the needle itself. Cut or grind the spring and make it as short as possible. The knob can work like a pendulum hanging out there in the air which will make your run all over the map and it can wear out the threads in the needle valve itself due to vibrations which can destroy the plating on the interior of the needle and or spraybar. The knob or the spring will come loose and it will do this for you typically and most inconveniently on the day your raising your hand for your official flight. The spring where it contacts the needle needs to be scarified and soldered. The aluminum however needs to be JB welded to the spring. Roughing up the spring and a thorough cleaning of lacquer thinner or acetone works. Place the JB weld and heat with a heat gun and let it run into the coils of the spring. I like to let it form a filet to the backside of the knob. I have some good information for you in regards to tank size, prop size, etc. All of what I suggest could be used as a guideline to know what to shoot for. The FP can be a difficult one in regards of engine run. While the engine might be working currently for you as a side winder, once you cowl it in and start dragging a much larger plane around the table quickly turn and things may not work so well. Let me know and I can assist you in the learning curve. Ken
Ken Cook- Top Poster
- Posts : 5653
Join date : 2012-03-28
Location : pennsylvania
Re: OS .40fp spraybar
Thanks, Ken. The .35 is what I've been using primarily on the old 38 oz. Skyray and It's so consistent I haven't had to touch the needle since the weather was cold. I've read on SH that the .40 isn't nearly the sweetheart the .35 is either. I flew it a few times one weekend and it seemed fine as a sidewinder, and was then shelved as it's plane was a hunk of junk. So far I've had some limited experience with inverted engines, and none of it was encouraging. So I'll probably be tapping you for advice when the time comes. Thanks.
Rusty
Rusty
_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
...and never Ever think about how good you are at something...
while you're doing it!
My Hot Rock & Blues Playlist
RknRusty- Rest In Peace
- Posts : 10869
Join date : 2011-08-10
Age : 68
Location : South Carolina, USA
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