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Futaba-RC . A Main Hobbies . Boca Bearings

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Main Discussion > Starter Box
 
 
stefanor
New Heliman
Location: CH

Hi all,
I just bought a dynatron starter for my OS91. (Had a lot of problems with "normal" 90class starter).
I always start my heli directly in the garage, and up to now I always had a 12V battery in the box, which always needs to be recharged...
Now I want to build a new starter box and was wondering if it would not be better for me to make it with a 220V transformer.
Does anyone already have experiences with that?
How many Amps at least do I need for the transformer?

Thanks a lot
Stefanor, CH
08-31-2008 01:02 PM
 
 
tarzan_eb
Senior Heliman
Location: Central Illinois USA

starter box

If you are useing one of those 7amp gel cell batteries they dont supply enough starting amps for the 90 size motors I don't think you will get the preformance from the dynatron to start your 90 that you are looking for.Alot of people run that dynatron on 24 volts.To answer your question you dont need 220 v transformer, a regular 120v /12 volt charger like hangar 9, 12 volt charger will work just attach charge leads to battery and leave transformer out so you can plug it in. I don't know for sure but I think you can use 2 of the gel cells wired in series which would give you 24 volts at 14 amps
Hope this helps

Fly it ! Crash it ! Rebuild it ! Repeat as needed !!
08-31-2008 01:59 PM
 
 
ccpm raptor
Heliman
Location: Delaware

I would just go with the finer edge adaptor. That would give you a cordless starter no bulky battery box to carry. But I still use my 18v milwaukee Drill to start my v-max 90 w/ .91 hyper pumped.
08-31-2008 02:39 PM
 
 
Mutt
Key Veteran
Location: t ca usa

or you can use two batterys like this you cn go higher mah too if you like I just used what I had laying around and it starts 90s up reeal easy. or you can go with 2 7 cells also. lots of ways to go

08-31-2008 03:18 PM
 
 
stefanor
New Heliman
Location: CH

Yes, this is a good idea. I will try to connect 2 batteries directly on the starter.
How many "starts" between recharging can you make with your 2x1500mAh batteries?

Thanks,
Stefanor
08-31-2008 04:27 PM
 
 
Mutt
Key Veteran
Location: t ca usa

I charge it once a month. I fly every week about 5 flights. WHen these batterys go I am going to get 3300 batterys
08-31-2008 04:40 PM
 
 
Ace Dude
Elite Veteran
Location: USA

This is my old starter. I'm using a Dynakita now, but this one worked well for many years.





08-31-2008 04:47 PM
 
 
rotormonkey
Senior Heliman
Location: Ottawa, ON - Canada

I use a 2200 mah 3s lipo to power my starter. Works like a champ, and you damn near never have to recharge it.
08-31-2008 06:06 PM
 
 
jbdww
Senior Heliman
Location: Round Rock, Texas

I have three 1900mah 7.2Volt 6Cell NiCad batteries in series attached to my starter. With this setup I can remote start my heli all day long. When I get back home from flying I re-charge my pack for the next time I go flying.
Joe

Skids Up
08-31-2008 07:48 PM
 
 
jetfixrguy
Senior Heliman
Location: Valparaiso, Indiana USA

Or just get a 4s or 5s lipo with about 5000mah and never turn back.
08-31-2008 07:59 PM
HOMEPAGE  
 
 
AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

I just said this again in another thread.
The only problem with 12v starters is using them on 12v.
For desired functionality, you need 14v to 18V.

. . . But if you want to keep having problems, stay on 12v.
08-31-2008 10:46 PM
HOMEPAGE  
 
 
jetfixrguy
Senior Heliman
Location: Valparaiso, Indiana USA

Exactly!!

Quote 
For desired functionality, you need 14v to 18V.
08-31-2008 10:55 PM
HOMEPAGE  
 
 
TRACERBOB
Senior Heliman
Location: Panama City, FL USA

I use a dynatron starter on my R/C hydros. It functions quite well on two 7 amp batteries hooked up to produce 24 volts. Just build your box to house two batteries, hook a jumper from one of the batteries positive to the others negative. Then hook up the starter to the two remaining posts. You'll be the envy of all your friends and you'll have the most borrowed starter at the field. One word of caution. Don't try to start a flooded engine with it. I can guarantee you'll bend the connecting rod.

Try not. Do or do not. There is no try
08-31-2008 11:30 PM
 
 
idigrc2
Veteran
Location: Anderson, CA

Here's my 90 setup, dynatron, sullivan wand, 2 3s 2200mah lipo in series straped to home made brackets. Turns my o.s 91 over like it's a 30


I once choked a smurf to see what color it would trun
08-31-2008 11:52 PM
 
 
Ace Dude
Elite Veteran
Location: USA

When the others are gone, the Dyantron lives on.

Once you go cordless you'll never go back.

The DynaKita is the only way to go.





09-01-2008 01:18 AM
 
 
stefanor
New Heliman
Location: CH

Thanks all for the answers.
I like very much the dynakita version... But it would be very difficult to get one in switzerland...
I just tried with 2x7.2V batteries (2000mAh each). Measured about 16V. Had no chance to spin my OS91SX... Than tried with 3x7.2V batteries in series: It works!!!
I just need to turn by hand up to the maximum compression point (just after), than the engine turns like it should be...
I will now mount the batteries on a U-Plate mounted on the starter.
Photos to follow..

If anyone can give me a good tip where to get the dynakit adapter would be great.


Thanks again
Stefanor
09-01-2008 01:28 PM
 
 
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