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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Exhaust tip for Century muffler
01-06-2013 11:53 PM  5 years agoPost 1
heliocolorado

rrNovice

brighton colorado

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Hey guys,

I lost the nozzle for my V2 pipe. I have it on a G20. Lost a few hundred RPM. have not had much luck with Century. Any ideas for a replacement part?

Thanks

DK

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01-07-2013 12:13 AM  5 years agoPost 2
Gearhead

rrMaster

Vt

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are you saying they are not in stock ????

http://www.centuryheli.com/products...71-1&pageid=173

Jim
Buzz Buzz Buzz

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01-07-2013 01:45 AM  5 years agoPost 3
heliocolorado

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brighton colorado

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Thanks. Have looked at the site several times with no luck

DK

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01-07-2013 02:24 AM  5 years agoPost 4
heliocolorado

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brighton colorado

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Actually it's a V5. Same parts?

DK

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01-10-2013 01:45 AM  5 years agoPost 5
strat1960s

rrApprentice

San Antonio Texas

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Had the same thing happen to me a while back. I know it's a bit "Shade Tree" , but I used an automotive coolant fitting. The ones that thread into the heater port and you attach a hose to it with a hose clamp. I don't know about the restriction, but it's cut down on some of the noise.

Ted

I always have fun. Some times are more fun than others.

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01-10-2013 10:31 PM  5 years agoPost 6
RM3

rrElite Veteran

Killeen, Texas - USA

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No its not a "bit" shade tree....its a whole lotta SHADE TREE

Chances are that the restriction made it quieter also gave up a bit on the high end...but if all you do is sport fly it then if it works, less noise, all I can say is...great idea!

When I was testing the V2 with the inserts and nozzle, I noticed about a 100 rpm max change on the engine...the highest RPM i could get was with the nozzle and no insert...then again this was with the modded engine I run...I have no idea what it would do with a stock one

showing a preference will only get you into trouble, 90% of everything is crap...

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01-10-2013 11:06 PM  5 years agoPost 7
heliocolorado

rrNovice

brighton colorado

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Hey Ted,

Kinda shade tree myself . What is the ID of the nozzle you are using?

Dave "

DK

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01-11-2013 01:25 AM  5 years agoPost 8
strat1960s

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San Antonio Texas

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It still has the paint on it from when I painted the motor from my 65 Mustang. LOL

Where the exhaust gasses exit the fitting is 6.55 mm. The I.D. on the threaded end is 11.12 mm.

This is only intended to be temporary. I do plan to replace the fitting with the correct fitting.

Ted

I always have fun. Some times are more fun than others.

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01-11-2013 03:00 PM  5 years agoPost 9
RM3

rrElite Veteran

Killeen, Texas - USA

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well if anything else your also setup to take an exhaust sample

showing a preference will only get you into trouble, 90% of everything is crap...

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01-11-2013 04:53 PM  5 years agoPost 10
heliocolorado

rrNovice

brighton colorado

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I have some of those from my racing days. What if I cut off the nipple and drilled out the ID say 1mm at a time, Checking the peak RPM each time?

DK

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01-11-2013 05:16 PM  5 years agoPost 11
strat1960s

rrApprentice

San Antonio Texas

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I've seen some that dont have the nipple and are threaded on the inside. You might be able to find some air compression fittings to thread in there for air restriction. They come in different sizes to accommodate different si zed air lines.

I always have fun. Some times are more fun than others.

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01-12-2013 01:07 AM  5 years agoPost 12
RM3

rrElite Veteran

Killeen, Texas - USA

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What if I cut off the nipple and drilled out the ID say 1mm at a time, Checking the peak RPM each time?
that would work...it would be best to check it on the bench with a prop that allows the engine to rev in the range where you have it set up in your heli...that way you can spend more time checking/cutting and fine tuning...thats how I check and tune my engine mods.

if you check it in the heli with say full collective climbouts, you may have issues getting accurate results as the rotor will also have to be dealing with any wind and up/down drafts...and you may very well end up chasing your tail as they say.

showing a preference will only get you into trouble, 90% of everything is crap...

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