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Old Jul 20, 2008, 09:16 AM
Registered User
United Kingdom, England, Surrey
Joined Aug 2002
837 Posts
Help!
Jepe pyranha on A123, wing plan needed

Hi,

Having stated previously that it seems impossible to fit A123 cells in a Pyranha I actually tried it and they do sort of fit ok, although they push the duct in a couple of mm this shouldn't be a problem since immediately after the fan it is >100%FSA.

I'm planning to run on 6S A123 (450g) on it's original 16/15/3.

AUW is at 975g which is much less than it used to be on nicads many years ago.

However when I upgraded it to lipo I made a smaller wing since it was so much lighter. I now need to make a new wing in the original size to carry teh a123 weight, does anyone have the dimensions, i've lost the instructions (and the old wing) and can't find them online.

Cheers,

Joe
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Old Jul 20, 2008, 10:25 AM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Uden Volkel, Netherlands
Joined Dec 2003
4,974 Posts
I have met Jepe before the shop burned down and he was bu far not fond of using A123 in his Piranha. For this I am nearly cursed

I am curiuos if you are able to balance the plane properly with 6a A123.

I have just purshased an Piranha (kit) wich I have to open. I will look up the dimensions asap.

Btw I am planning the JS1400 +ds30. Unfortunately A123 is not an option for this setup.

You might as well reconsider 1100mAh cells: 6s1p +6s1p. This will clear the duct.

grtz, Erik
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Old Jul 20, 2008, 10:26 AM
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Kevin Murray's Avatar
USA, NC, Greenville
Joined Dec 1999
9,271 Posts
I think it was on a PDF, I'll check the other computer and post it here if I can find it.
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Old Jul 20, 2008, 01:08 PM
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United Kingdom, England, Surrey
Joined Aug 2002
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Quote:
Originally Posted by Erik v. Schaik
I am curiuos if you are able to balance the plane properly with 6a A123.

I have just purshased an Piranha (kit) wich I have to open. I will look up the dimensions asap.

grtz, Erik
Hi Erik, I was going with 6S based on your testdata thread, do you know what watts I can expect on 6S and the 16/15/3? I would like to start hand launching it but need at least 700w for this weight, hence the normal size or slightly larger wing.

It balances at 45-50mm with 6S which is fine, I usually fly it at around 55mm.

Are the Pyranha's still available from somewhere? I would like to pick up one of the fully composite ones?

Cheers.
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Old Jul 20, 2008, 01:10 PM
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Joined Aug 2002
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Quote:
Originally Posted by Kevin Murray
I think it was on a PDF, I'll check the other computer and post it here if I can find it.
Thanks Kevin, I managed to find some original drawings from the designer which gave me a rough idea, 29" plus wing tips. I've just glued up a 33" wing, can always cut it down ;-)
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Old Jul 20, 2008, 03:20 PM
My project: FAIREY DELTA 1
Erik v. Schaik's Avatar
Uden Volkel, Netherlands
Joined Dec 2003
4,974 Posts
Glad to read my thread was of usefull for few of us.

You will be in the 650Watt rang with this setup if the /3 is the old 3000kV version.

Piranhas are no longer available and Jean Paul is not open for more kits/ parts on request. The Piranha moulds are for sale @1500euro.

I am planning 1400+ Watts in future. Hope to maiden my Jetmach at the end of this week. After my short holiday (Istanbul) I will continue the Huckebein/wm400/axi and the piranha after this.

You might even reconsider the /2@3s which should be very light @ identical power of NiCd version. (had the Beta version 9/10 with 12xcp1700 @1100gr)

Notice the servo lever

Still need the wing data?
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Old Jul 21, 2008, 05:14 AM
hul
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Switzerland
Joined Mar 2003
2,112 Posts
about 700W initial and 560W after 30s on the new (?) 2800rpm/V version. See this thread: http://www.rcgroups.com/forums/showthread.php?t=848535 Posts 34 and 50

Hans
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Old Jul 21, 2008, 07:26 AM
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United Kingdom, England, Surrey
Joined Aug 2002
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Quote:
Originally Posted by hul
about 700W initial and 560W after 30s on the new (?) 2800rpm/V version. See this thread: http://www.rcgroups.com/forums/showthread.php?t=848535 Posts 34 and 50

Hans
I have 4 16/15/3 motors all over 3 years old, any idea if these are the 2800 or 3000 versions?

I am currently running 6S A123 on a 22/30/3 direct drive prop model for a sustained 950W WOT run. Maybe I need a slightly heavier and higher kv motor than the 16/15/3. I will do some tests installed in the Pyranha and report back.
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