SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Apr 28, 2011, 11:42 PM
Registered User
Lantsov Alexey's Avatar
Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
264 Posts
I'm still trying to find the place that sells the micron film to cover http://www.freeflightsupplies.co.uk/lightweight.htm
Lantsov Alexey is online now Find More Posts by Lantsov Alexey
Reply With Quote
Sign up now
to remove ads between posts
Old May 18, 2011, 01:07 PM
Registered User
Penza, Russia
Joined Mar 2009
3 Posts
Quote:
I'm still trying to find the place that sells the micron film to cover
http://www.a2zcorp.us -> BuildingMaterials -> Covering
upshifting is offline Find More Posts by upshifting
Reply With Quote
Old May 19, 2011, 06:51 AM
slow but inefficient
Ron Williams's Avatar
Riverhead NY USA
Joined Dec 2000
3,097 Posts
Film:
http://www.homefly.com/products.asp?id=31
Ron Williams is offline Find More Posts by Ron Williams
Reply With Quote
Old Jul 26, 2011, 06:29 PM
Registered User
Joined Jul 2011
1 Posts
Where can I get this style propellers (carbon fiber)?
they are manufacturing are bought or own?
Thank you and good flight!
JNovelini is offline Find More Posts by JNovelini
Reply With Quote
Old Aug 02, 2011, 06:37 AM
srl
Registered User
srl's Avatar
Sydney New South Wales Aust
Joined Mar 2007
155 Posts
I've made some props, but still have to make the aircraft.
A lot of the materials will come from HomeFly.

srl
srl is offline Find More Posts by srl
Reply With Quote
Old Aug 03, 2011, 04:16 AM
Registered User
Kimmo Kaukoranta's Avatar
Tampere, Finland
Joined Apr 2004
82 Posts
JNovelini, yes the props are self made. The ones on the geared coaxial are laminated in a mold taken from a commercial plastic prop. The mold has the shape of the backside of the commercial prop. Instead of using a 2 piece mold, the laminate is just pressed against the mols in vacuum. The plastic of the vacuum bag makes up the second part of the mold.

The ones on the co-runner are laminated in 3 pieces (2 blades + spar/hub). The blades are glued to the hub in a jig so you get same pitch on both sides. A bit like what is done in rubber powered indoor planes, you know the wet balsa over a bottle etc, but with carbon instead of balsa. The benefit of this construction is that you can make different shape, diameter and pitch prop using the same molds. For example the ones I have made have a very wide blade for extra braking in the downlines, much wider than GWS/APC etc.

Nice pair of props srl, what size are those and how much did they end up weighting?
Kimmo Kaukoranta is offline Find More Posts by Kimmo Kaukoranta
Reply With Quote
Old Aug 03, 2011, 06:04 PM
srl
Registered User
srl's Avatar
Sydney New South Wales Aust
Joined Mar 2007
155 Posts
Hi Kimmo

10x4 and only made of west. 13g
I will try to make some lighter with 3600 now that the weather is starting to warm up.
I have two half's of the mould of one side of the prop. So its a matter of squeezing it some more.
It will be going into a light weight Index4
Thanks for building Ideas, will keep you updated on how its going.
srl
srl is offline Find More Posts by srl
Reply With Quote
Old Nov 07, 2011, 03:54 PM
Registered User
Kimmo Kaukoranta's Avatar
Tampere, Finland
Joined Apr 2004
82 Posts
Janne got the contra system set up in his Manta v3. Here's two videos of it flying last weekend in Iittala. With sub titles so you can also learn the names of the maneuvres in Finnish

F3P AP-13 Janne Lappi (2 min 26 sec)


F3P AF-13 Janne Lappi (2 min 28 sec)
Kimmo Kaukoranta is offline Find More Posts by Kimmo Kaukoranta
Reply With Quote
Old Nov 07, 2011, 11:55 PM
Registered User
Lantsov Alexey's Avatar
Russian Federation, Saint Petersburg, St Petersburg
Joined Jan 2009
264 Posts
Hi Kimmo.
Janne before flying on a propeller as slowly and clearly.
I want to know the opinion of Janne, preferably two propeller why?
F3P-AF11 Janne Lappi, Finnish F3P Championships 2011 (2 min 38 sec)
Lantsov Alexey is online now Find More Posts by Lantsov Alexey
Reply With Quote
Old Nov 08, 2011, 10:54 AM
Janne Lappi, F3A Team Finland
JanneL's Avatar
Helsinki, Finland
Joined Sep 2008
133 Posts
Terve, Alexey!

Before with the single prop gear reduction system the plane flew slowly enough, that was not the problem. But the torque caused by the huge propeller was a bit nasty because I had to use a little aileron on every upline to prevent the plane from rolling and in level flight or inverted flight I had to use some rudder, quite a lot in fact. Anyway it's possible to fly slowly and clearly but it required very careful compensations.

The coaxial added about 4-5g weight and I can notice it but it's still OK. The coaxial makes the plane fly very steadily and straight in every position thanks to the neutralised torque. It's a bit easier to fly maneuvers since I don't have to concentrate anymore on compensating the torque. Rolls and especially the ends of the rolls are very precise now. And I need no knife edge mixes anymore which makes knife edge maneuvers (like in the new final sequence) easier.

As for the brake on downlines, with coaxial it's as good as before with the single prop system. One thing that was maybe a bit better with the single prop system is that you always know what kind of compensation you have to do in maneuvers. Now, due to tiny breezes that always exist in halls the plane may turn slightly in some direction when for example pulling the plane onto a vertical upline. You can't know it beforehand whereas with the single prop system you can always know that you will have to use right aileron in uplines. But I don't consider it a problem, it is a rather insignificant thing. The neutralised torque is a much more considerable thing and I can say it is very nice. Based on an experience of a few practise sessions I prefer the coaxial.


Janne
JanneL is offline Find More Posts by JanneL
Last edited by JanneL; Nov 08, 2011 at 11:01 AM.
Reply With Quote
Old Nov 08, 2011, 06:05 PM
Registered User
Massachussets
Joined Nov 2005
261 Posts
Quote:
Originally Posted by Kimmo Kaukoranta View Post

This one is using 2 AP-03 outrunner motors weighting 3.25g a piece. Since there is no way to run a 10" prop direct drive with a 3g motor, gears are used. To give You an idea of the size, the diameter of the motor is around the same as the hub in a 10" GWS prop... pretty small.


http://www.youtube.com/watch?v=vErE-29IrIA
http://www.youtube.com/watch?v=8xSoNLkCf8Y
Kimmo

Hobby King has two ap-03 motors. One has a kv=7000 and the other has a kv=4200. I'm thinking you used the 4200 kv motor. Is this correct?

Thanks
wingster is online now Find More Posts by wingster
Reply With Quote
Old Nov 09, 2011, 03:14 AM
Registered User
Kimmo Kaukoranta's Avatar
Tampere, Finland
Joined Apr 2004
82 Posts
wingster, yes we are using the 4200kv motors.
Kimmo Kaukoranta is offline Find More Posts by Kimmo Kaukoranta
Reply With Quote
Old Nov 13, 2011, 06:54 PM
http://roys-rc-tv.webs.com/
Basingstoke Roy's Avatar
United Kingdom, England, Basingstoke
Joined Oct 2005
455 Posts
Hi Kimmo

Sorry I've taken a long time to reply, love your simple solutions.
I really like the idea of using brushes, to get the torque reaction from the one motor. Is the brush tension critical I.e. will to much cause drag, to little losses power or cause arcing?

Roy
Basingstoke Roy is offline Find More Posts by Basingstoke Roy
Reply With Quote
Old Nov 17, 2011, 02:48 AM
Registered User
Jurgen Heilig's Avatar
53859 Niederkassel, Germany
Joined Sep 2000
18,786 Posts
Quote:
Originally Posted by Kimmo Kaukoranta View Post
Janne got the contra system set up in his Manta v3. ...
Hi Kimmo,

does Janne use a single motor setup, or a twin setup as shown on your Fb page?

Jürgen
Jurgen Heilig is offline Find More Posts by Jurgen Heilig
Reply With Quote
Old Nov 17, 2011, 04:48 AM
Registered User
Kimmo Kaukoranta's Avatar
Tampere, Finland
Joined Apr 2004
82 Posts
Hi Jürgen,

Last winter Janne used a geared single motor system. That unit uses a single 5g motor to swing a 10" prop and weights 11g without the prop. This year he switched to the twin motor contra system and that is what he is currently using.

So on the above videos, in the one with last years final program, he was still using the single motor system. On the AP-13 and AF-13 videos he has the contra system.
Kimmo Kaukoranta is offline Find More Posts by Kimmo Kaukoranta
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Build Log EPP f3P Plane tallflyer SDPARKFLYERS 14 Feb 28, 2012 03:32 PM
Discussion The New Phantom F3P Plane by Budgetrc.com tallflyer Foamies (Kits) 8 Jun 04, 2011 01:37 PM
Question Very slow indoor plane - F3P or??? Petrik59 Foamies (Scratchbuilt) 2 Dec 31, 2010 07:03 AM
Discussion Galaxy F3P Review, hobbyking plane dhdsracer Electric Plane Talk 0 Dec 17, 2010 10:45 PM
Discussion Another full scale electric plane Bob Chiang Electric Plane Talk 5 Sep 09, 2010 10:20 PM