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Old Apr 11, 2014, 12:52 PM
Yay! Spring! I think ....
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United States, IL, Lombard
Joined May 2009
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Originally Posted by Entropy76 View Post
A couple more questions, since I'm using the triple bearing tail, witch adds 10mm, should I run 85mm tail blades? I bought Align 90mm...

Also FR4, (or anyone else), the YEP 100a ESC with 6a BEC, how did it turn out for you? Or please feel free to chime in with another option on ESC with out runnning an external BEC.
I think 90mm might be too long with the triple bearing tail ....

On the YEP 100A - I like it a lot. It's very versatile. I don't run digital servos however (except for the tail) so I'm not taxing the BEC all that much. I bought a 2nd one to put on my Swift NX but haven't yet due to not wanting to tear it all apart ...
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Old Apr 11, 2014, 08:07 PM
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duplicate.
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Last edited by rotoraddict; Apr 11, 2014 at 08:12 PM.
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Old Apr 11, 2014, 08:10 PM
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Originally Posted by Entropy76 View Post
A couple more questions, since I'm using the triple bearing tail, witch adds 10mm, should I run 85mm tail blades? I bought Align 90mm...

Also FR4, (or anyone else), the YEP 100a ESC with 6a BEC, how did it turn out for you? Or please feel free to chime in with another option on ESC with out running an external BEC.
The best blades one chooses for the tail rotor, is directly related to the main rotor speed one chooses to fly at and tail ratio which is related to the speed of the main rotor. For example, the tail rotor ratio on the Swift is relatively high at 5 to 1. So if your mainrotor is set to turn at 2000, then your tail will be turning at 10,000. That is one of the reasons why the Swift comes stock with relatively small tail rotor blades of 72mm. (These also help with tail rotor ground clearance)

Initially the Swift was designed to use 16 NiCd cells (19.2V) with power systems that would give about a 1600 head speed. This meant a t/r speed of 1800 x 5 =8500. It also used 520mm mainblades.

Most 520 to 550 sized nitro helis at the time, were turning main rotor speeds of 1600 with 4.78:1 t/r ratios. This gave them a 7650 tail rotor speed. As they used 85mm blades, the tail power was about the same.

As you can see, a 72mm bladed tail rotor turning at 10,000 plus, will mean far more powerful tail that will also result in far more gyro sensitivity etc. Now add 90mm blades and that is all compounded. Your tail rotor clearance would also be questionable with 90mm blades.

So if you are planning high rotor speeds I would not want to go to a length much longer then 80mm.

Any quality 80+ amp ESC's with a 5 or 6 amp BEC should be fine.
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Old Apr 12, 2014, 03:41 AM
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oakgrove LA
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Does anybody have a canopy they want to sell or someone tell where i can get one heliworld seems to be out of stock
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Old Apr 12, 2014, 06:57 PM
AMA# SIMAGES
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Hudson Valley
Joined Dec 2006
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Originally Posted by stutts121472 View Post
Does anybody have a canopy they want to sell or someone tell where i can get one heliworld seems to be out of stock
You bought an NX correct?

I don't have any extra however; did you post a "Wanted Ad" on RCG? Bet you someone will chime in with one or two.

Ron's Helicopter only has white or yellow Swift plastic... They also have a G20 canopy in stock
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Last edited by simages; Apr 12, 2014 at 07:01 PM. Reason: anal retentive correction
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Old Apr 12, 2014, 07:24 PM
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I have nx
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Old Apr 13, 2014, 12:57 AM
The Last Question
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Quote:
Originally Posted by rotoraddict View Post
The best blades one chooses for the tail rotor, is directly related to the main rotor speed one chooses to fly at and tail ratio which is related to the speed of the main rotor. For example, the tail rotor ratio on the Swift is relatively high at 5 to 1. So if your mainrotor is set to turn at 2000, then your tail will be turning at 10,000. That is one of the reasons why the Swift comes stock with relatively small tail rotor blades of 72mm. (These also help with tail rotor ground clearance)

Initially the Swift was designed to use 16 NiCd cells (19.2V) with power systems that would give about a 1600 head speed. This meant a t/r speed of 1800 x 5 =8500. It also used 520mm mainblades.

Most 520 to 550 sized nitro helis at the time, were turning main rotor speeds of 1600 with 4.78:1 t/r ratios. This gave them a 7650 tail rotor speed. As they used 85mm blades, the tail power was about the same.

As you can see, a 72mm bladed tail rotor turning at 10,000 plus, will mean far more powerful tail that will also result in far more gyro sensitivity etc. Now add 90mm blades and that is all compounded. Your tail rotor clearance would also be questionable with 90mm blades.

So if you are planning high rotor speeds I would not want to go to a length much longer then 80mm.

Any quality 80+ amp ESC's with a 5 or 6 amp BEC should be fine.
Thanks, so I'll be running 550mm mains at 2000rpm. This should give me plenty of agility from what I've read. So do 80mm blades sound about right rather than 72mm since I'll be running 550's (more torque). Thanks again Rotoraddict.
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Old Apr 13, 2014, 01:07 AM
The Last Question
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Originally Posted by stutts121472 View Post
Does anybody have a canopy they want to sell or someone tell where i can get one heliworld seems to be out of stock
I found this site on Google that says they have it in stock.

http://beyond-heli.com/product_info....oducts_id=1904

I've never bought anything from though and am not sure where they are located...
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Old Apr 13, 2014, 05:47 AM
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oakgrove LA
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Thanks for the help
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Old Apr 13, 2014, 12:59 PM
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Originally Posted by Entropy76 View Post
Thanks, so I'll be running 550mm mains at 2000rpm. This should give me plenty of agility from what I've read. So do 80mm blades sound about right rather than 72mm since I'll be running 550's (more torque). Thanks again Rotoraddict.
Even 72mm units work pretty well at that rotor speed. But 76mm carbons and 80mm carbons will give more power to the tail. As nothing is free, they will also take more power from the battery pack to drive.
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Old Apr 13, 2014, 01:02 PM
Yay! Spring! I think ....
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United States, IL, Lombard
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I find the 70-80mm tail blades work fine for normal (near 2000) RPMs - but I don't do 3D moves. I like putting longer ones on for lower head speed flights, where the extra length helps compensate for the lower rotational speeds.
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Old Apr 14, 2014, 10:07 AM
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What u guys think day glo pin strips lol
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Old Apr 14, 2014, 12:08 PM
Yay! Spring! I think ....
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Cool!

Hi-Vis
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Old Apr 14, 2014, 10:45 PM
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That will certainly help with visibility and orientation.
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