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europa(at)pstewart.f2s.co
Guest

Posted: Fri Oct 13, 2006 8:33 am Post subject: batteries

Can anyone give me some help with batteries? I've just priced up a  

17AH  'Red Top'  at 121 GBP. I can get hold of YUASA 17AH leads acid  

gel batteries for 37GBP.  THe only obvious difference to me is that  

the Red Top product claims 625A cranking power at 20 degC and the  

YUASA 450A.  Would this lower power be enough for cranking the 914 or  

am I missing another reason for spending an extra 100 quid?



Regards



Paul



G-GIDY

Gilles.Thesee(at)ac-greno
Guest

Posted: Fri Oct 13, 2006 8:53 am Post subject: batteries

Paul Stewart a écrit :

 	  Quote: 	
		   



 Can anyone give me some help with batteries? I've just priced up a 

 17AH  'Red Top'  at 121 GBP. I can get hold of YUASA 17AH leads acid 

 gel batteries for 37GBP.  THe only obvious difference to me is that 

 the Red Top product claims 625A cranking power at 20 degC and the 

 YUASA 450A.  Would this lower power be enough for cranking the 914 or 

 am I missing another reason for spending an extra 100 quid?


	


Paul,



A small four years old Hawker 7 Ah SBS-8 has ample power to lawlessly 

crank our Rotax 914. I tested  it from -14°C to +37°C.

The advertised cranking power is circa 300-400 A. The Rotax starter 

doesn't exceed one hundred peak amps.

So I believe there is no need to worry.



If it were my airplane, I would go for a smaller and lighter battery.

I believe that the Yuasa battery is rather of the Absorbed Glass Mat, or 

Recombinant Gas type, and not of the gel model. Gel batteries are best 

suited for traction (wheel chairs, fork lifts, etc...)

If you're not afraid of reading French, you'll find some info on AGM 

batteries at

http://contrails.free.fr/elec_bat_rg.php

Hope this helps,

Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

grahamsingleton(at)btinte
Guest

Posted: Fri Oct 13, 2006 8:53 am Post subject: batteries

Paul

imho the Yuasa should be adequate, if you want the best it probably has 

to be an Oddysey

Graham



Paul Stewart wrote:



 	  Quote: 	
		   



 Can anyone give me some help with batteries? I've just priced up a  

 17AH  'Red Top'  at 121 GBP. I can get hold of YUASA 17AH leads acid  

 gel batteries for 37GBP.  THe only obvious difference to me is that  

 the Red Top product claims 625A cranking power at 20 degC and the  

 YUASA 450A.  Would this lower power be enough for cranking the 914 or  

 am I missing another reason for spending an extra 100 quid?



 Regards



 Paul



 G-GIDY

Gilles.Thesee(at)ac-greno
Guest

Posted: Fri Oct 13, 2006 9:02 am Post subject: batteries

 	  Quote: 	
		  



 A small four years old Hawker 7 Ah SBS-8 has ample power to lawlessly 

 crank our Rotax 914. 


	


Should read "flawlessly"...



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

peter.rees01(at)tiscali.c
Guest

Posted: Fri Oct 13, 2006 9:42 am Post subject: batteries

Hi Paul



We fitted an Odyssey PC680 which I got from

http://www.tayna.co.uk/catalog/295/0/Enersys-ODYSSEY-Batteries-Enersys-ODYSSEY-Batteries-page1.html



which was the cheapest outlet at the time at £80 - Seems to work a treat 

(and about 6lbs lighter than the battery we took out.



Regards



Peter



---

europa(at)pstewart.f2s.co
Guest

Posted: Fri Oct 13, 2006 10:27 am Post subject: batteries

Thanks to all re batteries



Paul

ptag.dev(at)tiscali.co.uk
Guest

Posted: Fri Oct 13, 2006 10:30 am Post subject: batteries

Hi! Paul , I can't help you with technical comparisons but having the

Jabiru 3300 (it has six cylinders so two are coming on compression

together) and with two 13 AH red tops in parallel they have worked

flawlessly for in excess of six years and even with very negative temps

gave an immediate "light up" every time.

I always had to fly for up to an hour to be fully charged though and

after 3 starts within one hour it could need a second attempt.

All this was after it was necessary to perform jump starts from a plant

battery during the test flying. After which I moved the battery location

from the back to the P1 Foot well with welding wire leads.

Red Tops profess to be "starter" batteries so they give a remarkably

instantaneous discharge as is required for the starter.



Robt.C.Harrison G-PTAG in conversion to Rotax 914 !

--

raimo.toivio(at)rwm.fi
Guest

Posted: Fri Oct 13, 2006 10:37 am Post subject: batteries

I highly agree. I am very happy with my Odyssey.

It is over one year old and only once charged.

I have played almost every night with my panel...

The voltage over pins stays always 12,68V

(just like advertised). Notice never cranked /flied so far.



Raimo

oh-xrt

---

pete(at)lawless.info
Guest

Posted: Fri Oct 13, 2006 10:56 am Post subject: batteries

Good I have never been known for cranking 914s!



--

hurstkr(at)growzone.com.a
Guest

Posted: Fri Oct 13, 2006 3:50 pm Post subject: batteries

 	  Quote: 	
		   Jabiru 3300 (it has six cylinders so two are coming on compression

 together)


	


???  Respectfully Bob, I don't think that statement is correct.



Six cylinder engines have a compression event every 120 degrees of rotation 

of the crankshaft whereas a four cylinder has one every 180 degrees.



IOW, your Jab 6 cyl has 3 compressions per revolution and the Rotax has 2.



I assume the pistons in the 6 cyl Jab are larger in diameter than the Rotax 

engines.(hence larger top surface area)  If this is so, this could also 

contribute to the 6 cyl Jab being harder to turn over than the Rotax subject 

to the their relative compression ratios of course.



Cheers

Kingsley



do not archive (in case I'm wrong !)

SPurpura(at)aol.com
Guest

Posted: Fri Oct 13, 2006 4:42 pm Post subject: batteries

I agree with Graham,get an Oddysey,they are much lighter and hold a charge longer. [quote][b]

ptag.dev(at)tiscali.co.uk
Guest

Posted: Fri Oct 13, 2006 11:24 pm Post subject: batteries

Hi! Kingsley

Yes of course I understand the compressions sequences re. four stroke

six cylinder versus 4 cylinder but the point I make is also contained in

your own statement .....that when the current compression cylinder is

being pushed over top dead centre there is also one soon following it's

compression stroke on the six configuration needing more effort from the

starter to get up the required momentum for the following compressions.

All very relevant ....well in the early stages when the compressions are

half decent ! That's why the six sounds like a sewing machine.



It's just a shame the torque produced at the end of all that activity

isn't so precisely described by the manufacturers in comparison with

other engines of half the cubic capacity .....difference between

Australian Ponies and real time Horses !



Regards

Bob Harrison G-PTAG (waiting for the ultimate comparison!)

Do not archive

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