Mailing List flyrotary@lancaironline.net Message #21870
From: Ian Beadle <ianb@ozzienet.net>
Subject: Re: [FlyRotary] Re: How long can you fly on your battery??
Date: Sun, 15 May 2005 21:01:32 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message
 
----- Original Message -----
Sent: Saturday, May 14, 2005 10:12 PM
Subject: [FlyRotary] Re: How long can you fly on your battery??

The usual FI 13B in a plane will go for about 3 to 4 hours.

Ian.

 
3 to 4 hours?  I think I'd have to see that to believe it.  
 
Here are some measurements I took with a DC clamp meter. 
 

NOT RUNNING:

 

Fuel pump 1- 6.2 amps

Fuel pump 2- 6.0 amps

Facet transfer pump- 1.1 amps

Davies Craig EWP- 4.4 amps

EC-2 (also ignition coils)- .3 amps

EM-2- .6 amps

Master switch only- 6.4 amps (what is all this?)

Radio (receive mode)- .7 amps

Transponder-  .5 amps

CD player- .3 amps

 

RUNNING:

 

Minimum config includes FP-1, EWP, EC-2, EM-2, and of course ignition coils.  Alt is turned off because the master is off.   12.1 amps at 1500 rpm, 14.1 amps at 3000 rpm.   

 

I had the plane tied down, and was standing next to it, with the clamp meter on the battery cable in the baggage compartment behind the seat.  3000 rpm is about all I dared to run.  If the current increase is linear with rpm increase, then I'd be pulling 18.1 amps at 6000 with the EWP on.  Without it, 13.7 amps. 

 

Max load, as I normally fly, includes everything.  Alternator is off though, because I couldn’t measure the load at the main battery lead with the alt supplying power- 22 amps at 1500 rpm. 

 

Estimate 28 amps at 6000. 

 
Cheers,
Rusty (price questions deleted <g>)


You will have to fit a car battery. Too many pumps. With Tracy's fuel pump( one for each tank) no transfer pump no EWP the usual radios Michrotech emc and engine monitoring. Measured in line with a digital meter < 4 amps. 16 Ah batt. = endurance of 3 to 4 hours. The alternater was only 12 amps!

Why would the current increase so much with RPM ?  May be a bit more for the injectors.( Full on 2 inj. 14ohms 2 amps) The high pressure pump runs at constant speed. 

Happy flying
Ian Beadle.



Internal Virus Database is out-of-date.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.11.6 - Release Date: 6/05/2005
Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster