FP blades on a belt CP?.....possible?  
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All Forums >> RC Helicopters >> Electric RC Helis >> Esky Helicopters >> FP blades on a belt CP?.....possible?
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FP blades on a belt CP?.....possible? - 6/23/2008 10:13:39 AM   
Kelownan


 

Posts: 113
Joined: 2/13/2008
From: Nelson, NEW ZEALAND
Status: offline 		Im intrested out of an experimental sort of thing. would i get enough lift if i jammed some Honeybee FP blades on my BeltCP
an knocked the pitch curve flat. Would it work? as in would the blades get sufficcient lift to compensate for the extra weight of the CP.

I dont really want to try untill i hear something from the pro's

but it could be a cool experiment.

_____________________________

Walkera HM5#10, Esky Belt-CP, Kyosho Caliber 400 EP
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RE: FP blades on a belt CP?.....possible? - 6/23/2008 1:52:51 PM   
funflier


 

Posts: 767
Joined: 11/29/2004
From: South City, CA, USA
Status: offline 		I believe that the fp blades actually have a weak Clark type airfoil to them (basically flat on the bottom and convex on the top) sooo I wouldnt see why they wouldnt work. AT half stick you might try for 0 deg pitch as the airfoil may be enough to provide enough lift. I hope your doing this with a updated tx so you can adjust throttle curve and pitch curve...
I wouldnt try this with the stock tx as you may get too much headspeed up too fast and have your heli take off like a shot for about 4 feet then run out of it and drop like a rock, or worse just be unpredictable/uncontrollable.

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King ll, 3800w/11t, cnc head, custom cnc/trextail, 43t ,Turnigy 40A ESC/UBEC bult in, Telb gyro, Dx6i w/6100e RX, HS-65 serv

(in reply to Kelownan)
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RE: FP blades on a belt CP?.....possible? - 6/23/2008 3:47:57 PM   
Druss


 

Posts: 4129
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline 		I don't think it would work too well. You're taking blades from a 300 size heli and putting them on a 450 size... I just don't think they have the required lift.

(in reply to funflier)
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RE: FP blades on a belt CP?.....possible? - 6/23/2008 10:57:35 PM   
funflier


 

Posts: 767
Joined: 11/29/2004
From: South City, CA, USA
Status: offline 		hahaha I read back I had King ll on my mind. I agree with you Druss.



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King ll, 3800w/11t, cnc head, custom cnc/trextail, 43t ,Turnigy 40A ESC/UBEC bult in, Telb gyro, Dx6i w/6100e RX, HS-65 serv

(in reply to Druss)
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RE: FP blades on a belt CP?.....possible? - 6/24/2008 2:07:30 AM   
Kelownan


 

Posts: 113
Joined: 2/13/2008
From: Nelson, NEW ZEALAND
Status: offline
quote:

ORIGINAL: funflier

I hope your doing this with a updated tx so you can adjust throttle curve and pitch curve...



Yes i have a Handed down Jr 7ch radio for the job. PS if you look closely the underside of the FP blades are concave

quote:

ORIGINAL: Druss

I don't think it would work too well. You're taking blades from a 300 size heli and putting them on a 450 size... I just don't think they have the required lift.



Tis what i thought. initaily i figgured the extra headspeed would make up for it but... I guess if i attempted it then i would need
to build my own. like zima did.
Would i need to adjust the throttle too as i guess it would pick off the ground with alot less head speed.

I was just wondering if the control system would still work.....

_____________________________

Walkera HM5#10, Esky Belt-CP, Kyosho Caliber 400 EP

(in reply to funflier)
       Post #: 5

RE: FP blades on a belt CP?.....possible? - 6/24/2008 3:55:01 AM   
Druss


 

Posts: 4129
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline 		the control system would work, and you would need more head speed to lift off on the belt cp than you would if you were using the belt cp blades....

Think about it for a sec, the belt cp blades are around 325mm. The HBFP blades are around 250mm... that's a rotor disk that's 680mm vs. 510mm, a 170mm difference.

(in reply to Kelownan)
       Post #: 6

RE: FP blades on a belt CP?.....possible? - 6/24/2008 5:39:26 AM   
funflier


 

Posts: 767
Joined: 11/29/2004
From: South City, CA, USA
Status: offline 		wow thats a big area 362,984 Sq mm for the belt and only 65,025 sq mm for the fp
Laid on top of each other makes the fp look like the hole in a donut!
So in theory what rpm would the head have to spin to lift this sucker
10,000 rpm???? more?

_____________________________

King ll, 3800w/11t, cnc head, custom cnc/trextail, 43t ,Turnigy 40A ESC/UBEC bult in, Telb gyro, Dx6i w/6100e RX, HS-65 serv

(in reply to Druss)
       Post #: 7

RE: FP blades on a belt CP?.....possible? - 6/24/2008 6:27:18 AM   
Druss


 

Posts: 4129
Joined: 8/10/2007
From: Edmonton, AB, CANADA
Status: offline 		Not sure that you'd even want to try. I doubt that the FP wooden blades would be able to handle the stress of rotating fast enough to lift the belt cp.

(in reply to funflier)
       Post #: 8

RE: FP blades on a belt CP?.....possible? - 6/24/2008 10:32:28 AM   
funflier


 

Posts: 767
Joined: 11/29/2004
From: South City, CA, USA
Status: offline 		I was kidding of course

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King ll, 3800w/11t, cnc head, custom cnc/trextail, 43t ,Turnigy 40A ESC/UBEC bult in, Telb gyro, Dx6i w/6100e RX, HS-65 serv

(in reply to Druss)
       Post #: 9

RE: FP blades on a belt CP?.....possible? - 6/25/2008 9:32:24 AM   
Kelownan


 

Posts: 113
Joined: 2/13/2008
From: Nelson, NEW ZEALAND
Status: offline 		So if i made some 320mm FP blades but made them much wider than the HB ones. More surface area would move more air correct?

I guess it would take a bit of trial an error to get the profile and weight right.

_____________________________

Walkera HM5#10, Esky Belt-CP, Kyosho Caliber 400 EP

(in reply to funflier)
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RE: FP blades on a belt CP?.....possible? - 6/28/2008 12:45:12 PM   
funflier


 

Posts: 767
Joined: 11/29/2004
From: South City, CA, USA
Status: offline 		probably not as you would have to not only make them wider but you have to make up the swept area of the belt blades. Do you really think your motor and ESC can turn a blade that maybe2 or 3 times wider then stock up to headspeed high enough to lift it.
Why not just make your own CP blades as that is where your going to be at, If your maing fp blades long enough and wide enough for a belt cp your just making belt cp blades anyway.

_____________________________

King ll, 3800w/11t, cnc head, custom cnc/trextail, 43t ,Turnigy 40A ESC/UBEC bult in, Telb gyro, Dx6i w/6100e RX, HS-65 serv

(in reply to Kelownan)
       Post #: 11

RE: FP blades on a belt CP?.....possible? - 6/29/2008 2:59:52 AM   
Kelownan


 

Posts: 113
Joined: 2/13/2008
From: Nelson, NEW ZEALAND
Status: offline 		Yea i Dig.... I was only after an opinion none the less, I didnt expect it to be possible.

I'd imagine it would be a hard process to make blades that were light but strong. Glass fibre i guess but thats not the main problem.
It would be a lot of money on upgrades to my electrics and motor, it wouldnt really justify the possibilty of it working.

Atleast i got an answer to satisfy my curiosity.

_____________________________

Walkera HM5#10, Esky Belt-CP, Kyosho Caliber 400 EP

(in reply to funflier)
       Post #: 12

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