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Piwakawaka funfly

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Piwakawaka - a pint sized aerobat!

Piwakawaka - a pint sized aerobat!

The plan build article by Ray Huntley - 19/6/09

Patrik Gertsson02/02/2009 19:03:36
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27 forum posts
5 photos
Search on this site and youtube didn´t give any results.
Is there anyone out there with some experience?
/patrik
Mowerman05/02/2009 09:32:53
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1541 forum posts
105 photos
Hi Patrik
Piwakawaka.
Easy build.Flys great apart from will noy bunt!
On my second due to loss of control and lost model over moorland!
2 others in our club (calderdale W Yorks)
Power by BRC 2409-12/ESC combo (aprox £30) 3s 2200 lipo from Ebay
Servos 4x 9g.
Futaba 2.4ghz Rx. Initialy 35mhz but suffered glitching.
Patrik Gertsson05/02/2009 19:14:34
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27 forum posts
5 photos
Tnx for info.
We have 2 juniors ( i think more will join the train) in the club who wants to build something "fast".
I have come to the same conclusion as you regarding the motor but will go for a smaller battery to save some weight.
The wing is to hard for the juniors to build so i have tried to vrap something from 3 mm foam "depron".  Estimated weight for wing with ail approx 100 gms.
I cant see any reason why it wont bunt......
The club tread
/Patrik

Mowerman08/02/2009 09:24:22
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1541 forum posts
105 photos
Hi Patrik
With the 3s 2200 lipo both mine ballanced as plan wiyh no ballast.
A smaller pack would probably need ballast and give shorter duration.
Your wing looks good.
good luck
 
Patrik Gertsson08/02/2009 10:02:54
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27 forum posts
5 photos
You are probably right - the nose is a little short.
We have to build the tail light
 
I have another idea i have tried om a Kyosho Ferias.
I mount the motor on a light 2 mm aluminium U-profile.
This will take a lot of abuse - it is that kind of plane or
 
The mount will also make it easy to move the motor 25 mm forward to adjust the cog.
 

/Patrik
Patrik Gertsson09/03/2009 20:40:58
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27 forum posts
5 photos
 
A few weeks - and we will be airborn.
Andy Gates19/04/2009 20:59:10
636 forum posts
19 photos
I am sorry to contradict other posters but the Pi does indeed bunt and she does so very well.
This plane is highly aerobatic and very adaptable.
I built mine with a 2 piece wing so it will store in a nice small box for holidays.
Not only that, I also have a additional centre section which increases the wingspan and lowers the wing loading which is great for soaring although the rudder is a little marginal with the extra span.
Patrik Gertsson20/04/2009 18:08:31
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27 forum posts
5 photos
The first Pi is flown and it is a funfly who will loop and bunt just as easily.
The second Pi is almost ready.
The third Pi is on its way built in 6mm depron and with a "trainer wing" with V-form and no ailerons.
Mowerman21/04/2009 16:42:57
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1541 forum posts
105 photos
Well done Patrik.
Trying harder with mine I find bunts are possible but not as tight as loops.
Any sugestions anyone?
Andy Gates21/04/2009 16:57:56
636 forum posts
19 photos
Where is the CoG on your machine Mowerman, and do you have to add any down to your plane while inverted?
 
If you add lots of down, then it would suggest the ailerons are deflected downwards or the CoG is too far forwards.
 
I set my ailerons as flaperons so I can adjust them to neutral while in flight, that way inverted needs no down and the response to loops and bunts are the same.
 
I have my controls rated, normal throws which are great for pattern type aeros and gneral flight, high rates for square loops and wacky rolling verticals.
Patrik Gertsson21/04/2009 17:00:18
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27 forum posts
5 photos

Is the elevator travel same up and down?

Do you need some down elevator when you are flying upside down?
 
Thrust line?
 
Angle of incidence?

Patrik Gertsson21/04/2009 17:02:00
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27 forum posts
5 photos
Sorry - all was said i few minutes before
 
Mowerman22/04/2009 17:52:52
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1541 forum posts
105 photos
Broke it today - wrong model memory
Will try again when fixed.
Andy Gates22/04/2009 19:02:36
636 forum posts
19 photos
...and another lesson hopefully learnt...
 
Sorry that happened, go steady on the repair to try not to add too much weight or reinforcement.
There is an addage in electric plane building, build in lightness and build to fly not to crash.
Patrik Gertsson22/04/2009 19:52:39
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27 forum posts
5 photos
Wrong model memory - happens to the best - but not to Spektrum
Lightness is not only for electric - it is for all type of flying - or not ?
The Piwaka seems to be a strong model with a sturdy box fuselage.
I have made some ply reinforcements for the gear and firewall.
Mowerman22/04/2009 19:53:29
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1541 forum posts
105 photos
Build to fly and not to crash.
I must try to remember that.
Andy Gates22/04/2009 20:24:08
636 forum posts
19 photos
Patrik
 
You are right to a point, build for lightness is really for electric.
 
With IC, lightness comes secondary to strength to hold that vibrating lump on the front. So normally substantially larger wood sections are used.
 
The Pi is an incredibly strong airframe.
It needs little if any reinforcement.
I made a few changes so it would pack away easier and yet be stronger than elastic banding.
My wings are bolt on at the back and clip under the front upper cover.
The tailplane is located on 2 carbon fibre studs and retained with a single nylon screw.
The undercarriage wires sit in a balsa ply sandwich which itself sits in a balsa box in the lower fuselage.
Patrik Gertsson23/04/2009 18:59:23
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27 forum posts
5 photos
Andy
I realize that it is "extremely hard" to get planes as Amber fitted with IC
I think that the Piwaka would fly just as well with an IC engine without any more reinforcements. I have flewn bigger and lighter planes with cox engines.
 
The Pee Wee was a really cute engine - but i like the silence of the finer electric setups.
There was certainly no larger wood sections in the plans i have in memory and also can be seen at my club.
 
We are currently converting a CL-plane to electric (400W).
I dont think we could have used much lighter design if we had built the plane for electric from the start.
Patrik Gertsson25/04/2009 07:48:33
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27 forum posts
5 photos
My first video of the "erratic flying bird".

The viddler link is
http://www.viddler.com/explore/pgerts/videos/32/ 
Skip direct to the Piwaka tag if you dont like Control line flying and RTF Wingdragon - Turn down the sound if you dont like the Schrek movie .
Patrik Gertsson25/06/2009 13:44:56
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27 forum posts
5 photos
Another Trainer-Pi. This is built as a first plane without ailerons.
All built with "depron" foam.

And another one in the air :




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