Trex 600 pinion question - HeliFreak
Fun, Learning, Friendship and Mutual Respect START  HERE


Unregistered
Go Back   HeliFreak > R/C Helicopter Support > 600 Class Electric Helicopters


600 Class Electric Helicopters 600 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


Reply
 
LinkBack Thread Tools Display Modes
Old 04-28-2012, 12:53 AM   #1 (permalink)
Registered Users
 
Posts: 227
 

Join Date: Oct 2011
Location: United States
Question Trex 600 pinion question

My current setup is a Neu 1912H/1Y with a Jive 80HV on 10s.

Currently I am running a Trex 600 helical main gear with a 13t pinion and getting about 2200 in the beginning of the flight. Throughout the flight the rpm drops and it seems like the tail gets stuck in some hard maneuvers.

I was wanting to go to a 14t pinion but I cannot seem to find any 6 mm helical pinions, it would give me about 2420rpm in the beginning of the flight, and I'm assuming the tail would have more power also.

I found a 15t 6mm helical pinion, it would give me 2585rpm in the beginning of the flight, but I'm wondering if this will be to many amps for the motor esc and helicopter.

I am also running a BLS 9256 tail servo.

Any help would be great, Thanks!
anthony7820 is offline        Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 04-28-2012, 04:27 AM   #2 (permalink)
Registered Users
 
Posts: 4,181
 

Join Date: Apr 2008
Location: Brisbane, Australia
Default

If I have got the right motor kV at 825kV and the right main gear teeth at 188T, I don't think you will be getting 2200rpm for very long;

825 x 37 x 0.9 x 13T / 188T = 1900rpm at 100% throttle.

Even with a fresh lipo at 4.0V (and it does not stay above 4.0V per cell very long - like seconds);

825 x 40 x 0.9 x 13T / 188T = 2053rpm

At a full 4.2V per cell it would be 2156rpm.

The only way you will get more than this is by having better than 90% efficiency on the motor. I think your headspeed calcs may be a little optimistic . Better to work on what you would get at the end of a flight rather than the first few seconds.

If you were planning to govern, which would avoid the speed drop during the flight), you could only govern around 1900rpm with this setup.

With a 15T, you could govern to around 2200rpm, which would be ideal. Your ESC should be able to govern very nicely - use it

I think your servo may be a S9256, not a BLS 9256. The BLS are the newer brushless servos and the 251 or 254 have slightly more torque than your 9256, but it should still be up to it on a 600.

Colin
__________________
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
Andy01 is offline        Reply With Quote Quick reply to this message
Old 04-28-2012, 01:10 PM   #3 (permalink)
Registered Users
 
Posts: 227
Thread Starter Thread Starter
 

Join Date: Oct 2011
Location: United States
Default

Thanks, and the servo is a BLS 9256.

I'll go with the 15t pinion and govern at 2200rpm
anthony7820 is offline        Reply With Quote Quick reply to this message
Old 04-29-2012, 04:36 AM   #4 (permalink)
Registered Users
 
Posts: 4,181
 

Join Date: Apr 2008
Location: Brisbane, Australia
Default

Quote:
Originally Posted by anthony7820 View Post
Thanks, and the servo is a BLS 9256.
Sorry about that - I could not find a BLS servo with a 4 digit number on the Futaba site;

http://www.futaba-rc.com/servos/brushless.html

But I did find a s9256, but digital, not brushless (second from the bottom);

http://www.futaba-rc.com/servos/digital.html

I must have missed it somewhere. Sorry, I am assuming it is a Futaba servo, which may also be incorrect.

Colin
__________________
Vario Long Ranger 700e
Seahawk 600
UH-1N 500
Baumann EC-145 800+ (coming soon )
Andy01 is offline        Reply With Quote Quick reply to this message
Reply




Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the HeliFreak forums, you must first register.
Please enter your desired user name, your REAL and WORKING email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself. Use a real email address or you will not be granted access to the site. Thank you.
Email Address:
Location
Where do you live? ie: Country, State, City or General Geographic Location please.
Name and Lastname
Enter name and last name here. (This information is not shown to the general public. Optional)
Helicopter #1
Enter Helicopter #1 type and equipment.
Insurance
Please select your insurance company (Optional)
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On




Copyright © Website Acquisitions Inc. All rights reserved.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
 

SEO by vBSEO 3.6.1