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Old Nov 19, 2012, 11:25 PM
If it flies I like it.
HotdogX's Avatar
Madison, AL
Joined Sep 2004
467 Posts
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Jepe Pyranha Exhaust Size?

Question for anyone who has built and flown a Jepe Pyranha. I'm building a Jepe Pyranha from the glass fuse and wood wing/tail kit. The cut off foam cup that is used for the tail cone gives a tail pipe diameter of 47mm. The photo instructions don't show or state what the tail pipe exhaust diameter should be. 47mm seems a bit small for a 70mm fan (WeMoTec 480), but since the cup was already cut off in the kit am I safe to assume the 47mm diameter is correct? I'm using a Mega 16/15/3 motor on 4S LiPo.
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Old Nov 19, 2012, 11:45 PM
Do it Right, the first time!
CoolerByTheLake's Avatar
United States, MN, Hermantown
Joined Dec 2008
5,876 Posts
Here's a 70mm shroud ID, with a motor tube OD of 31mm . Might help.


Exhaust Diameter (single outlet)
100% FSA 62.76145314
95% FSA 61.17229765
90% FSA 59.54074235
85% FSA 57.86320074
80% FSA 56.13555023
75% FSA 54.3530128
70% FSA 52.50999905
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Old Nov 19, 2012, 11:47 PM
High Dynamic Thrust
stoneenforcer's Avatar
United States, FL, Mt Dora
Joined Feb 2007
2,307 Posts
52-54mm
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Old Nov 20, 2012, 07:15 AM
EDF Jet Jam 2015, May 28-31st
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,696 Posts
Quote:
Originally Posted by HotdogX View Post
Question for anyone who has built and flown a Jepe Pyranha. I'm building a Jepe Pyranha from the glass fuse and wood wing/tail kit. The cut off foam cup that is used for the tail cone gives a tail pipe diameter of 47mm. The photo instructions don't show or state what the tail pipe exhaust diameter should be. 47mm seems a bit small for a 70mm fan (WeMoTec 480), but since the cup was already cut off in the kit am I safe to assume the 47mm diameter is correct? I'm using a Mega 16/15/3 motor on 4S LiPo.

That is the correct diameter for the minifan on 4s. I would love to find a virgin jepe kit. Kevin Saunders added ailerons to his and it rolls much better.
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Old Nov 20, 2012, 07:22 AM
If it flies I like it.
HotdogX's Avatar
Madison, AL
Joined Sep 2004
467 Posts
Guess I'll split the difference and go with 53mm.

I already have the wing built and shaped, so not sure how I'd put ailerons in at this point. It's a very thin wing. One could use two separate servos, but it would be tricky to run the leads now that the ribs are already installed. Guess I'll just go with the tailerons for now.

Thanks for the help guys!

Al
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Old Nov 20, 2012, 07:47 AM
High Dynamic Thrust
stoneenforcer's Avatar
United States, FL, Mt Dora
Joined Feb 2007
2,307 Posts
ive got a glass wing. not used. just pm me if you want it.
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Last edited by stoneenforcer; Nov 20, 2012 at 08:06 AM.
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