Motor question. - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Electric Flight Discuss Electric Flight in Canada

Closed Thread
Thread Tools Display Modes
Old 05-10-2006, 05:24 PM   #1
RCC Apprentice
Join Date: Feb 2006
Location: Nova Scotia

Feedback: 0 / 0%
Posts: 29
Total Props: 0
Motor question.

       Remove this ad - become a site supporter!
I see a lot of planes that I like that ask for a 400 speed engine. Would a 370 speed engine with a 20amp ESC and 3 cell lipo be enough to power a 400 speed plane?

How much a of difference is there between the 2 different sized engines?
amelvin is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 05-10-2006, 05:48 PM   #2
RCC Expert Contributor
rscamp's Avatar
I am: Rob C
Join Date: Dec 2002
Location: Dundas, ON

Feedback: 1 / 100%
Posts: 864
Total Props: 0
I gather you already have the motor?

With electric motors the supply voltage has a large impact on the performance. With electric power systems, it helps to think of the motor and battery together, as the performance is determined by them both. The battery is more than just a gas tank.

Speed 400 motors are very inexpensive metal "can" motors with wet ceramic magnets. They generally come in two varieties - 7.2V and 6.0V, the latter having a "hotter" wind which develops more RPMs per volt. They generally run at a low efficiency of about 55% or less and they get hot (or worse) when pushed too hard. Depending on the application, you might get away with a smaller motor with some models, but the maximum power output available will be somewhat less.

3s LiPos may be too high a voltage for such a motor. At that high a voltage in most aircraft you will be challenged with gearing the motor down sufficiently and/or going to small props in order to avoid ruining the motor with overcurrent and to operate the prop with a reasonable aerodynamic efficiency.

The amperage rating of the controller is incidental and has virtually no effect unless its rating is exceeded.

There is so much more interesting stuff to read about this on the 'net. Check out RCGroups for example. Maybe start with the Beginner Training Area. If you have a specific application in mind, we can provide a more specific recommendation.

A day without sunshine is like ...night.
rscamp is offline   Quick reply to this message.
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
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.
Email Address:
Your Name
Your first name and last initial is required if you plan on using the forum.
Which city & province you live in. This is mandatory for classified listings.
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
vBulletin Message

Thread Tools
Display Modes

Forum Jump

All times are GMT -5. The time now is 07:02 AM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.