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HelicopterTools and Field Equipment › 14.4V with dynatron enought to start a 90???
07-13-2008 11:37 PM  9 years agoPost 1
Street Flyer

rrNovice

Las Vegas, NV, USA

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I am about to get myself a 90 sized bird, and I am doing to some research on what starter battery to get. So will 2 6 cell nimh sub C packs in series start a 90 with the sullivan dynatron starter?

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07-13-2008 11:48 PM  9 years agoPost 2
Wingman77

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Pulaski Tennessee

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yea it should do just fine

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07-14-2008 07:56 AM  9 years agoPost 3
SniperKitten

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Wiltshire, UK

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Did it yesterday with Sullivan Dynatron and Sullivan PowerPac (12 x NiCad Sub C cells)! Recommended.

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07-15-2008 05:40 PM  9 years agoPost 4
kcass518

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Manhasset, NY - USA

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If 14.4 works, 14.8 would be even better, right? I put a 4S LiPo on my Dynatron. It's light, powerful, and I only charge it once a week. It lasts all weekend for me and everyone else who borrows it. I'm not starting a 90, but it cranks my 50 with no problem. I know LiPos need to be handled with care, but it sure works well for me.

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07-16-2008 03:20 PM  9 years agoPost 5
baddynergy

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sierra madre, ca- usa

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So will 2 6 cell nimh sub C packs in series start a 90 with the sullivan dynatron starter?
it will work just fine. I have been using that set up for a long time now. 2 6cell 3300mah battery packs. I can go about 2 months flying everyweekend without charging. I am running a YS91SR.

**Unattended children will be givin a shot of espresso and a puppy**

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07-17-2008 10:44 PM  9 years agoPost 6
shawgl

rrKey Veteran

Murrieta, CA

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Should work, but if it doesn't just go to seven cells. I had a Cspec that was a real motherf*%*r and it took at least 18 volts when it was new. It would melt the contacts on my dynatron. It was the only motor I had like that.

In God we trust, everyone else we monitor.

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07-18-2008 01:40 AM  9 years agoPost 7
Street Flyer

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Las Vegas, NV, USA

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What size mah packs do you guys use?

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07-18-2008 07:09 AM  9 years agoPost 8
shawgl

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Murrieta, CA

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I made two eight cell sub c 3300 packs from batteries I bought at our clubs swap meet. Great deal for some new batteries. The only reason I went to eight is because of the nightmare I had with that one motor I had. And believe me..... With two eight cell packs...... You can start your car if you needed too.
Greg

In God we trust, everyone else we monitor.

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07-18-2008 03:13 PM  9 years agoPost 9
kcass518

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Manhasset, NY - USA

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My 4S LiPo is 2100 mah from FMA ($62.25 + frt, or $70.25 total) Helis only get 2 hours a day to fly here, but after 4 days of my starts and many of my buddies starts I put back about 500 mah. I'm very happy.

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07-18-2008 05:34 PM  9 years agoPost 10
shawgl

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Murrieta, CA

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Kcass518,
Can you post a pic of your setup. I may go that route if I have any issues with my batteries. They have been sitting for about eight months so we'll see how they are when I get home.

Greg

In God we trust, everyone else we monitor.

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07-18-2008 06:10 PM  9 years agoPost 11
kcass518

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Manhasset, NY - USA

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Shazam! The bracket is from ModelAircraft via RonLund.com MA4688. The LiPo has velcro stuck to the bottom to hold it to the bracket base, then I have a safety velcro strap (red) going around the battery and the bottom of the starter bracket (I don't know if I need it, but it's there). The length of the battery is just right for the width of the bracket. I have no trouble getting my hand around the starter - nothing is in the way. I'll try to start someone's 90 this weekend if I can to let you know how it does.

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07-18-2008 07:25 PM  9 years agoPost 12
shawgl

rrKey Veteran

Murrieta, CA

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Very nice, I have a similar setup, I just need to loose those giant battery packs. God bless Lipo's!!!

In God we trust, everyone else we monitor.

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07-18-2008 07:42 PM  9 years agoPost 13
kcass518

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Manhasset, NY - USA

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Yeah, but they say to be REAL CAREFUL with LiPos if you try to start an engine with vapor lock. They don't like to be stalled. I've hit the starter a few times where the engine was a bit flooded, but haven't had a battery problem yet. If I hit the starter and it doesn't turn over, I stop immediately and clear the engine.

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07-18-2008 08:08 PM  9 years agoPost 14
red_z06

rrProfessor

Dumont, NJ

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Dynatron has a stall current of about 100amps. As long as your pack continuous current is about 100amps, you will be fine even through a hydro-lock. A 25c rated 4s3800 or 5s3800 will be hydro-lock safe.

www.JustinJee.com

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07-18-2008 08:17 PM  9 years agoPost 15
kcass518

rrVeteran

Manhasset, NY - USA

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That's good to know, Red, but going to a 3800 mah LiPo is a more serious investment from what I can see.

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07-18-2008 08:42 PM  9 years agoPost 16
red_z06

rrProfessor

Dumont, NJ

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Look for used heli packs. No matter how tired it is, it will be more than enough for a starter. What I have found is that NiMH can't handle the big current. Every time you start a 90, you will get a big grin across your face. You will be so eager to lend your starter to a buddy who is having trouble starting.

www.JustinJee.com

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07-18-2008 08:47 PM  9 years agoPost 17
red_z06

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Dumont, NJ

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http://runryder.com/helicopter/t431364p1/

I just looked this up in classified. If you look harder, you will find cheap lipos to use on your starter. Align lipos may not be good for helis but will work well for your starter and you can get them cheap.

www.JustinJee.com

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07-18-2008 09:02 PM  9 years agoPost 18
red_z06

rrProfessor

Dumont, NJ

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http://runryder.com/helicopter/t440999p1/

This looks like a good deal for your starter.

www.JustinJee.com

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07-25-2008 02:53 PM  9 years agoPost 19
kcass518

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Manhasset, NY - USA

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OK, today was my first opportunity to start a 90 with my Dynatron with the 4S FMA LiPo on it. It was a YS 90 and started like butter. I understand 90 Hypers are more difficult, but don't have access to one, so I can't say if it will work or not. My guess is that it would have no problem.

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08-01-2008 07:35 AM  9 years agoPost 20
mchammer

rrElite Veteran

California,USA

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I use 2 6cell 3300 mah packs on a dynatron and it starts 90s no prob.

Peace Through Superior Firepower!!!

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