START HERE |
|
Register | FAQ | PM | Events | Groups | Blogs | Calendar | Mark Forums Read |
Unregistered
|
Scale Helicopters Discussions About Scale Helis, compatibility and and projects |
|
LinkBack | Thread Tools | Display Modes |
08-27-2015, 05:09 PM | #1 (permalink) |
Registered Users
Join Date: Aug 2011
|
Scale helicopter low head speed question
Im starting with a trex500 dfc pro. I bought the Castle Talon 90 esc. I'm switching the head to a non dfc head for lower head speed. What KV motor should I go with? The brand of motor doesn't matter. I'm trying to not go with a scorpion. Also is there a proper pinion and main gear size I should start with? Thank you and I appreciate any input
|
Sponsored Links | |||
Advertisement |
|
08-28-2015, 12:26 AM | #2 (permalink) |
Registered Users
|
What headspeed do you want to run at, what heli is this going into? Need to know this before we can give any advice.
__________________
Allan TREX 250 PRO,Talon15, GPRO, Zeal ----TREX 500 EFL PRO, GPRO, RAILS ----2x TREX 450PRO V2, 1xGPRO&1xBRAIN, Talon35, RAIL , Zeal ---- SAVOX powered TREX500 EFL in Roban scale UH1-N ---- TREX 600 EFL PRO, GPRO, RAILS ---- DX9 ---- |
08-28-2015, 04:19 AM | #3 (permalink) |
Registered Users
Join Date: Apr 2008
|
Yup, need details as above. Current gears, flying style, # of blades etc ?
RPM = kV x (3.7V x # of cells) x 0.9 x pinion teeth / main gear teeth = rpm at 100% towards the end of the flight. For CC ESCs you want to run the governor between 90-95%. My 500 sized UH-1N runs at 1700rpm - not sure if this what you had in mind with "low headspeed" ? Colin
__________________
Vario Long Ranger 700e Seahawk 600 UH-1N 500 Baumann EC-145 800+ (coming soon ) |
08-28-2015, 11:34 AM | #4 (permalink) |
Registered Users
Thread Starter
Join Date: Aug 2011
|
I'm new to this for sure. I just want my 500 set up right the first time so I don't need to keep switching out anything as I go. Scale is what I've always wanted to do. Thank you for your input
|
08-28-2015, 11:36 AM | #5 (permalink) |
Registered Users
Thread Starter
Join Date: Aug 2011
|
I'm going with the AS350 fuse from RC Areodyne. I'm looking maybe 1200 or so for head speed. Starting with a 2 blade non dfc head. I don't have the pinion and main gear yet. I just would like to set up my trex500 pro the right way out the gate.
|
08-29-2015, 03:20 AM | #6 (permalink) |
Registered Users
Join Date: Apr 2008
|
I would not recommend going as low as 1200rpm on a 500, especially with only two blades. It may fly, but I suspect that you will have a number of problems, starting with poor tail response.
I am afraid I can't be of more help until the number of variables are narrowed down. Looking at the calculation above that only that seems even potentially known is that it is likely to be 6s - with no gearing it is impossible to determine a motor kV. Perhaps set yourself up a spreadsheet where you can input the available gear data, and get some options for a motor. I think you may struggle to find a 500 sized motor that is around 800kV ( a guess). Good luck with your project and keep us updated with how it goes. Colin
__________________
Vario Long Ranger 700e Seahawk 600 UH-1N 500 Baumann EC-145 800+ (coming soon ) |
08-29-2015, 07:34 AM | #7 (permalink) |
Registered Users
Thread Starter
Join Date: Aug 2011
|
Thank you for the response. I'm trying to get any info I can but I'm guessing I'll set it up with what I have for a motor and test things as I go. I'm new to all of this is my problem. Thank you for your input again. I greatly appreciate any response.
|
Thread Tools | |
Display Modes | |
|
|