Fun, Learning, Friendship and Mutual Respect START  HERE

Go Back   HeliFreak > R/C Helicopter Support > Scale Helicopters > Power Systems

Power Systems Power Systems Discussion

LinkBack Thread Tools Display Modes
Old 11-30-2013, 06:13 PM   #1 (permalink)
Registered Users
Posts: 95

Join Date: Jul 2013
Default Motor kv for 700 size scale

Im looking at 700 size mechanics to fit in a scale fuselage and, got to thinking what range of kv for electric motor would be suitable.

Im kind of guessing that it is maybe like 'how long is a piece of string' type question and depends of final gearing?

All I can say is the fus will either be a Vario EC 145 using X Treme mechnics or Marvelcraft AS350 using Align 700 mechs. So, any indicators on what kv would be suitable? For scale flying is generally a high kv (upto 1000kv) best or is it better to use a motor of around 500kv?
hoverinabout is offline        Reply With Quote Quick reply to this message
Sponsored Links
Old 12-01-2013, 05:14 PM   #2 (permalink)
Registered Users
Posts: 2,646

Join Date: Mar 2008

Better to run a lower Kv Motor for slower headspeeds on scale, also gives more torque.
I run my 700 size scale AS350 with a 480KV motor in my Trex 700E mechanics, gives me a nice strong 1100 to 1400 rpm range on my 700mm 3 bladed head.
On my large turbine powered AS350, the headspeed is only 850 rpm !!!
Please bare in mind with most Trex like mechanics, the main shaft will be too short for a good scale look so you will need to get a longer one made, standard Trex 700 shaft is about 215mm long, (DFC shorter) my custom shaft is 255mm long, as I wanted my Starflex head to sit at the correct hight.
Still a fair bit of fettling to get these bolt on bodies to look/ work correctly but easier for someone new to scale than a Vario build, as there is MUCH to do, I have built about 8 Vario models now and it still amazes me how much work they are lol.
Good luck in your project, and photos of your progress would be good.

Henseleit TDR, Minicopter. Mikado. Jeti Carbon Red DS16. Plus scale stuff
satsuma is offline        Reply With Quote Quick reply to this message

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
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:
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.
Helicopter #2
Enter Helicopter #2 type and equipment.
Helicopter #3
Enter Helicopter #3 type and equipment.
Helicopter #4
Enter Helicopter #4 type and equipment.


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 © 2021 DragonByte Technologies Ltd.

SEO by vBSEO 3.6.1