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HelicopterMain Discussion › will a 12V battery start a 90 size machine?
08-09-2007 11:54 PM  10 years agoPost 1
Amarjit

rrApprentice

Chicago, IL

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Hi Everyone,

Just purchased a sullivan Dynatron starter, and wanted to know if a 12V battery will be enough power to start a 90size machine, or do I have to upgrade to 14.4 volts?

THanks!
ANdy k

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08-10-2007 12:30 AM  10 years agoPost 2
tadawson

rrElite Veteran

Lewisville, TX

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It kind of depends on the 12V battery in question - if it can deliver enough current, or if the starter will pull it down. Looking at the specs on the Dynatron compared to the Hi-Tork (which I run at 14.4), it looks like the Dynatron should be OK, with the right 12V power source.

- Tim

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08-10-2007 01:57 AM  10 years agoPost 3
switch26

rrKey Veteran

San Jose

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it should work just fine,i've used my dinatron on a 12 volt 7 amp gel cell and works ok,but the battery can get drained pretty quick

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08-10-2007 02:14 AM  10 years agoPost 4
rcmike

rrVeteran

Dickson, TN

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Well, A 12V battery will start about any car or truck so I doubt a little heli would be a problem. Like already stated, it depends on what type of battery it is.

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08-10-2007 03:01 AM  10 years agoPost 5
Furious Predator

rrProfessor

Kitchener, Ontario,​Canada

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i use a 12V lead acid 7.5Ah battery for field use, it will start my 90 normally with no problems.

Shawn
Team Leisure-Tech
Team HelixRC

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08-10-2007 04:07 AM  10 years agoPost 6
Amarjit

rrApprentice

Chicago, IL

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thanks for the responses

i actually will be using a lawn tractor battery...so I assume that this will work fine.

Thanks again!
Andy k

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08-10-2007 05:03 AM  10 years agoPost 7
shawgl

rrKey Veteran

Murrieta, CA

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Worst case cenario you can loosen the plug a 1/2 turn until the motor is broken in. I use a car battery with my dynatron and it can be tough with a new motor where at 14.4 it turns right over. I'm building two eight cell sub c packs for it now.

In God we trust, everyone else we monitor.

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08-10-2007 05:12 AM  10 years agoPost 8
midwestpilot

rrElite Veteran

Crystal Lake, IL

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starts a V8 dont it?

so will be no problem.. like stated above..depends on the starter

In life there is no spacebar!

Rich Erikson AMA 6175

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08-10-2007 05:14 AM  10 years agoPost 9
Shoego Heli

rrVeteran

San Diego, CA, USA

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I use a small car battery or a riding lawnmower battery for my dynatron to start my YS91 all the time. The only time it doesn't work is when there is a hydrolock situation, then I have to clear the cylinder.

Having my heli: Cool, Having a working heli: Awesome, Having a day to fly: PRICELESS!

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08-10-2007 05:47 AM  10 years agoPost 10
tadawson

rrElite Veteran

Lewisville, TX

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starts a V8 dont it?

so will be no problem.. like stated above..depends on the starter
It's not the voltage, it's the current AND voltage . . . . a 12V gel-cell will NOT start a car, but it's still 12V! Hence the comments about the battery and current delivery capacity . . .

- Tim

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08-10-2007 11:38 AM  10 years agoPost 11
RICH.L

rrKey Veteran

east springfield​p.a.

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why mess with a 12 volt battery that has to be lugged around when for about $45.00 you can have a 14.4 volt setup that will fire up that 90 many,many times before needing a recharge?

Here is what I bought for my torquemaster 180 and I wonder why I didn't do it sooner!

I bought a power core starter pack from tower hobbies for $28.00 and from day one that thing wouldn't even turn my 90 over,plus the gel cel pack needed charged daily.

in the end it's your money,just trying to help so someone else doesn't make the same mistake I did.
rich
http://www2.towerhobbies.com/cgi-bi...?&I=LXMUU0&P=ML

http://www2.towerhobbies.com/cgi-bi...?&I=LXLMS9&P=SM

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08-10-2007 12:27 PM  10 years agoPost 12
Xircom

rrVeteran

Kuala Lumpur -​Malaysia

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Rich, I thought NiCad will deliver more apms, than NiMh (of course there is also no memory effect with NiMh, but ...)

*** fly more ***

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08-10-2007 01:57 PM  10 years agoPost 13
RICH.L

rrKey Veteran

east springfield​p.a.

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nicads probably would have more punch,I liked these ones because they already had the deans connectors on them.

if you searched tower hobbies you could probably find some nicad ones fairly cheap as well.

or if you wanted a killer starter throw a couple of 7 cell packs on and that would give you 16.8 volts!

one of the guys at the flying field has his torquemaster 90 set up with (2) 8.4 volt packs and that thing is ballistic
rich

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08-11-2007 08:23 AM  10 years agoPost 14
Helinutnz

rrElite Veteran

below 42 South

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don't run any more than 18 volts on that thing. It will weld the switch contacts closed. (not too mention wind the engine so fast the clutch starts to grab and if it flings off you will have heli and start shaft flying everywhere) Been there and done that.

Nimh batteries will provide plenty of punch. the car guys use them all the time. Get low resistance high discharge capable cells for 14.4 volt.

I made an adapter for my dynatron that uses a kevlar timing belt and ali pulley reduction drive to reduce the speed by half and vastly increase the torque. I use a 12 volt 7.5ah gelcel and start my helis for about a month before needing a recharge. (it also provides glow power) Don't need high speed starters for heli's. I also start my 50 with it. It does 1000 rpm only.

I know some guys use this successfully on a 12 volt gelcel and thats all but my 90 wouldn't start well on this setup until I put the reduction drive on. Need torque and not speed....ever seen a plane guy start a prop engine with a quick back flick on the spinner....ya speed is not important. I have well and truly proven it with my starter.

GEAR reduction drives suck big time. Belt is so much smoother.

Look at this also. http://www.runryder.com/helicopter/t358045p1/

The 14.4 volt system is probably the easist to do

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08-11-2007 04:31 PM  10 years agoPost 15
w.pasman

rrElite Veteran

Netherlands

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It's not the size or voltage of the battery that matters.
It's about the right combination of starter and battery.

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08-11-2007 05:25 PM  10 years agoPost 16
AirWolfRC

rrProfessor

42½ N, 83½ W

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All model starters are "rated" for 12V - - - BUT that only consistently works well IF you can guarantee 12V at the starter, not counting the voltage drop in the lead wires or a low battery.

The way to overcome that "misleading" 12V rating is to increase the voltage by as much as 50%. Then, even a 90 size will start with a TorqMaster-90. I use 16 cells CP-1700. Been using this setup for 6 years and counting.

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08-11-2007 06:34 PM  10 years agoPost 17
tauscnc

rrKey Veteran

Joliet IL

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I use a 4 cell 4400 mah lipo with the geared starter,,,AWESOME! I think I have charged it a few times this year

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08-11-2007 09:19 PM  10 years agoPost 18
electriciancarl

rrVeteran

East Mesa Az.

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http://www.afineredgemfg.com/

Check this out.

Treat me good, I'll treat you better. Treat me bad, I'll treat you worse.

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08-13-2007 12:21 PM  10 years agoPost 19
contest10

rrApprentice

England

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12 volt gel cell will start a car actually. Try it for yourself. You can get some 12 volt batteries to start a 90 helicopter.

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08-13-2007 02:49 PM  10 years agoPost 20
AirWolfRC

rrProfessor

42½ N, 83½ W

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12V gell cell, yes, with the starter motors available for hobby use, no.

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