BVM PP 1/5th F16 air leak problem
#1
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BVM PP 1/5th F16 air leak problem
I have been fighting a air leak for about a year now. Rob at BVM has been most helpful. My hope is getting feed back from other 1/5th owners. I had about 50 flights on it then the problem started. I have been flying Jets with air systems for over 20 years. The air leak is inconsistent and seems to be effected by temperature. Rob at BV sent me oversized Orings for the main and nose. At Tucson after cycling it flew great for 15 flights. Today at our field it was about 55 and when I turn it on I get a air leak. I cycle it a few times and the problem seems to go away as the day gets warmer. My thinking is the main rams are blowing by the Orings . I plan on getting some cold spray to put on the rams to get it to fail on the stand. Thanks In advance Dan Avilla
#2
My Feedback: (20)
Hi Dan,
I had some leaks when mine was new. I talked to Rob and he thought it could possibly be blow by inside the cylinders. I treated both sides of each cylinder on gears and doors. Was a little tedious but after doing every one on both sides it solved the problem. I never discovered the exact cause but the leak stopped. The only other leak I had was a bad valve. I isolated it by swapping and eventually had to replace the valve.
Good luck. Its a great flying jet.
Gary
I had some leaks when mine was new. I talked to Rob and he thought it could possibly be blow by inside the cylinders. I treated both sides of each cylinder on gears and doors. Was a little tedious but after doing every one on both sides it solved the problem. I never discovered the exact cause but the leak stopped. The only other leak I had was a bad valve. I isolated it by swapping and eventually had to replace the valve.
Good luck. Its a great flying jet.
Gary
#3
To isolate which cylinder pinch the lines either end of each cylinder when it starts to leak (before any cycling) if you only changed the main seal it could be the rod seal in the end of the cylinder, it’s the most likely if you got so many cycles before it started to leak. I have seen ‘rough’ cylinder rods ‘sand’ away the o ring opening the clearance. You can also drip some silicone oil on the rod/cylinder end when it’s leaking and see if it bubbles.
Dave
Dave
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Join Date: Apr 2004
Location: BrisbaneQueensland, AUSTRALIA
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Hi Dan,
I had an air leak in my line to the speed breaks. I simply disconnected the power connectors to the relevant air valves to isolate the problem. It might be a good first step to verify your leak is actually in the rams.
Cheers,
Derek
I had an air leak in my line to the speed breaks. I simply disconnected the power connectors to the relevant air valves to isolate the problem. It might be a good first step to verify your leak is actually in the rams.
Cheers,
Derek
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yeahbaby (04-11-2021)
#6
Brand new BVM 1/5 L-39 - I found a couple air leaks where the tiny air lines fit over the fittings. They were intermittent at first. Ended up replacing several air lines. Some of the OEM tubing would just split when you pressed in on the fitting. The issues I found where both on the fittings where they transition from tiny air lines to normal sized airlines.
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Join Date: Jun 2006
Location: Gold Coast, Queensland, AUSTRALIA
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JanR