RC India
Welcome Guest, please login or register.
 
Pages: 1 2 [3]  All   Go Down
0 Members and 1 Guest are viewing this topic. Topic Tools Topic Tools 
Read
« Reply #50 on: August 20, 2010, 11:10:24 PM »
CrazyPilot
Plane Lover
Forum Hero

*****

Reputation Power: 8 
CrazyPilot has no influence.
Offline Offline

City: Noida
State: Uttar Pradesh
RC Skills: Beginner
Posts: 648
Join Date: Jul, 2010



Buy a wattmeter and test on the ground.  Way to peace of mind/nirvana in leccies !

Hellow Anwar Sir, I got my wattmeter and i need some help. Kindly tell me what are the different readings and how are they useful? i was testing a turnigy aerodrive 42-60 sk series motor with 6s 4400 mah (two 3s 2200 in parallel), apc 12X6 E prop and 80 amp besc. the readings are as in pic below. how do i calculate thrust to weight ratio? and what about other readings. thx

http://img153.imageshack.us/img153/6590/hk0101.th.jpg
Motor, ESC & Motor Mount Heating up


Logged

When you fly electric, fly clean, fly quiet, and fly safe!
 

Read
« Reply #51 on: August 21, 2010, 08:36:23 AM »
vinay
Global Moderator
Forum Hero

*****

Reputation Power: 20 
vinay barely matters.vinay barely matters.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 1754
Join Date: Sep, 2009



CP, if you put 2 3S in parallel then your cells will become 3s 4400 mah and not 6s 4400 mah.

Here is what you should see:

Current:
1)Your 2200 batteries 20c in parallel can give you a maximum of 88 amps, but you should not draw more than 70 amps from it. Good for your batteries.
2)Your motor should not consume more than 70 amps with the prop.

Put your watt meter between the motor and batteries and chek to see if the amps are not more, amps indicated by A on your meter. Slowly increase throttle and see readings. Also make sure your ESC is getting good air flow. Check the temperature periodically.

Voltage:
It also shows how much the voltage drops when load increases.

WATTS:
It shows voltage x amps

AH:
It shows how much mah the motor has consumed from your battery since you started the experiment.

Connect watt meter properly. Connecting the battery to watt meter where you are supposed to connect motor will burn it.

Aaal da best!

« Last Edit: August 21, 2010, 08:40:04 AM by vinay » Logged
 

Read
« Reply #52 on: August 21, 2010, 08:42:42 AM »
vinay
Global Moderator
Forum Hero

*****

Reputation Power: 20 
vinay barely matters.vinay barely matters.
Offline Offline

City: Bangalore
State: Karnataka
RC Skills: Beginner
Posts: 1754
Join Date: Sep, 2009



You would need a spring balance setup etc to calculate thrust to weight ratio. Cant do that with a watt meter. You can see the trust by visiting hobbycity and reading user reviews for respective props.
Logged
 

Pages: 1 2 [3]  All   Go Up
Jump to:  

Related Topics
Subject Started by Replies Views Last post
Break away motor mount for bl 2204
Electric Planes
Pikle6 2 5069 Last post June 25, 2009, 08:41:04 PM
by Pikle6
Wooden motor mount for Park Flyers
Tools, Materials and Building Techniques
ujjwaana 1 3334 Last post March 21, 2010, 12:10:15 AM
by technophile
motor,aquaprops and motor mounts.
For Sale - Completed
pankaj 9 6859 Last post March 18, 2011, 02:53:57 PM
by Rooster
How to attach motor mount to coro fuse.
Electric Planes
happysoul74 23 13589 Last post September 06, 2011, 08:10:23 AM
by adyonfire4
multiplex funjet ultra motor and motor mount
Wanted
Ahamed 3 3089 Last post August 12, 2014, 12:33:46 PM
by vishalrao