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e-Miniature Aircraft Furion - Razor - Ion-X > What´s your main rotor HS?
 
 
furychamarro
Senior Heliman
Location: Villahermosa, Mexico

Hi everybody,

A friend of mine called me a few minutes ago telling me that he just flew his new ION. He could only achived a max main rotor head speed in idle up 2 of 1790rpms. His setup right now is linear in all the curves ( -11, +11) and he is using the recommended 5S4PU batteries. He asked me what can he does to make this new baby turn the headspeed at 1850 rpms. I answered I had no clue since I´ve never owned an electric. So here I am asking you guys, do you have any idea on what to do??

Thank you very much,


Vic
06-25-2004 Over year old.
 
 
JonMann
Senior Heliman
Location: Clayton, CA

have him check to make sure he is in normal mode on the ESC. if it is in heli mode you will get a lower HS and not the recommended way to run it.
06-26-2004 Over year old.
 
 
Optech
Key Veteran
Location: Vista/Oceanside, CA.

Do the controllers get very hot during extended hovering at partial throttle?

Mike

Viva La Airtronics!
06-29-2004 Over year old.
 
 
JonMann
Senior Heliman
Location: Clayton, CA

only if you are running the throttle below approx 80%. you should have an idle up throttle curve that goes 100%-80%-100% and hover using that instead of using a "normal" throttle control/curve 0%-50%-100%. these things like to be running as close to 100% throttle as possible for best efficiency (less heat).
06-29-2004 Over year old.
 
 
Optech
Key Veteran
Location: Vista/Oceanside, CA.

So what would be the solution if you like/need to run a two speed set-up?

Say 1450 hover/1900 FFF?

Mike

Viva La Airtronics!
06-30-2004 Over year old.
 
 
JonMann
Senior Heliman
Location: Clayton, CA

Govenor, but trying to get a 1450/1900 setting with an electric will probably get you in trouble with the lower HS for an extended period of time. If you try to "throttle back" electrics, the ESC/Motor are just less effecient and will generate more heat. You just have to think about these a little differently than nitro motors that will idle and run at a midrange with no problems.
06-30-2004 Over year old.
 
 
Optech
Key Veteran
Location: Vista/Oceanside, CA.

Just playing the bad advocate here a bit but what about the 3D planker guys that sit and hover at 1/2 -3/4 throttle for most of the pack. Its a common saying in electric texts/articles that to maximize your flight time you need to fly at reduced throttle for most of the flight.

The reason I'm asking is that in FAI type competition, very few people could complete the hovering manuvers at 1900rpm and have them look competitive. Especially if it gets windy/gusty.

Mike

Viva La Airtronics!
07-01-2004 Over year old.
 
 
JonMann
Senior Heliman
Location: Clayton, CA

The plankers (I have a couple of large electric planks) that they are flying 3d are generally geared (take alot of the load off the motor), only swinging a prop (one of mine swings a 20x8 prop but that is nothing compare to 690mm rotor blades) and the propwash helps alot with cooling. So they can tolerate more throttle.

If someone was going to fly an electric competitively in FAI, my guess is that they would have to gear the heli down to reduce the headspeed. 3D would be one gear ratio, FAI would be another. Don't we do the same thing with nitor heli's? I believe most the FAI guys fly a gear ratio below 8, most of the 3D stuff is done above 8.
07-01-2004 Over year old.
 
 
Optech
Key Veteran
Location: Vista/Oceanside, CA.

Actually your gearing the heli up (by that I mean you are "shifting" up) to reduce engine rpm at a given headspeed. You get a quieter engine and better fuel consumption. The newer larger engines tolerate this because the "torque" band is lower.

Regardless of your final gear ratio to the engine. Most still run a two headspeed set-up. A lower headspeed for the hovering manuvers and a higher headspeed for doing the aerobatic manuvers. There is no way you'd build enough forward speed to carry you through the fast large FAI type aerobatics at 1450 headspeed. And unless you've got Curtis Youngblood reflexes, trying to do the hover portion at 1900+ is suicide.

Helicopter engine had to develop with larger cooling heads.... Maybe better heat rated ESCs need be produced????

Mike

Viva La Airtronics!
07-01-2004 Over year old.
 
 
KillerBob
Heliman
Location: Denmark

Mike

With Ion-X - headspeed is 2000+ with the stock 52t gear. Following recomendation not to go below 85% you'll have headspeed over 1900...

I fly with that - (actually I fly with 100% all the time) and neihter me nor the heli have commited suicide for that reason. It takes a little getting used to - but that's all

BTW - my reflexes are probaply 10% of CY's or below

Regards
Lars
07-01-2004 Over year old.
HOMEPAGE  
 
 
chriss
Senior Heliman
Location: Sunny Florida

If you want a really good two speed setup, the thing to do is get yourself an 8S3P or 4P pack. Use the 8s pack for your hovering stuff and the 10S pack for your aerobatic stuff, gear for top end. This works well as you can still run full speed on the speed control in both setups. You could split the difference and run a 9S setup for both, I have done this too. I do not recommend it as it can lead to charging mistakes but it is an option.

Chris
07-01-2004 Over year old.
 
 
JonMann
Senior Heliman
Location: Clayton, CA

Damn Chris, that is a great idea! Wish I had thought of that Much better suggestion than gear and alot more practical.
07-01-2004 Over year old.
 
 
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e-Miniature Aircraft Furion - Razor - Ion-X > What´s your main rotor HS?
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