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HomeAircraftHelicopterThunder TigerOther › Which starter for OS70
08-09-2009 01:49 PM  8 years agoPost 1
MickeyMoo

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Ohio

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What kind of starter are people using? I have a hobbico 90 and it was OK for the 50 using a lead acid battery but it would not start my OS 70. I started using a power drill but it does not crank fast enough to start these engines effectively. One guy told me he used two 7 cell (nimh) packs with a Hobbico 90 to start his 90. This lead me to try my 90 starter on a 4s lipo but it pulled more than 50 amps and had the starter smokin What I'm wondering is if a Hobbico 180 starter and a 4s lipo pack would be a good/inexpensive choice?

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08-09-2009 02:30 PM  8 years agoPost 2
FlaG8r

rrElite Veteran

Florida

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I think a 3S lipo with the Hobbico 90 would be fine.

Life is tough, it's tougher if you're stupid

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08-09-2009 03:48 PM  8 years agoPost 3
Ben-T-Spindle

rrProfessor

Central Illinois

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When my OS70 was new it did take a lot of torque to start it. I ended up putting a 12v and 6v battery in series to get enough torque. That’s the cheapest solution. I have an Hobbico starter and it worked great with the extra voltage.

A 4s LiPo or 5s LiPo would do the trick. I don’t think that a 3s LiPo will turn over a new OS70 – that motor has lots of compression.

... BTS

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08-09-2009 04:13 PM  8 years agoPost 4
MickeyMoo

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Ohio

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Just came from my workshop. The OS 70 only has 28 flights on it so its still breaking in. I tried the Hobbico 90 with 3 3s1300 packs in parallel. The starter would stall for about a second then work through the compression and repeat. Didn't take long for smoke to appear. I think its the insulation on the wire inside. I'm sure a 4s pack will work. Ben, do you have the hobbico 180 or the 90? I'm thinking I'll need the 180 if the 90 is smoking on a 3s. Unless changing and shortening the wires will correct this. BTW I have not shorten the wires on the starter for these test.

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08-10-2009 03:34 AM  8 years agoPost 5
jschenck

rrProfessor

La Vista, NE.

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One guy told me he used two 7 cell (nimh) packs with a Hobbico 90 to start his 90.
I have a 180 with two 6-cell NiMH packs and it'll start a 90. If you can swing the extra money a Dynatron is a great starter. Mine is 15 years old now. Also the new Align starter is nice, for a geared starter.

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08-12-2009 07:01 PM  8 years agoPost 6
MickeyMoo

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Ohio

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I really like this OS 70 engine but it seems to have a ton of compression. Today I just wrecked the one way bearing in my clutch (engine not flooded) using the 18v drill to start it. Once it is started it runs great. I may just have to go back to loosening the glow plug each time I start the engine.

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08-12-2009 07:04 PM  8 years agoPost 7
jschenck

rrProfessor

La Vista, NE.

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suggestion, run the starter on it a few seconds before applying the glow heater. Also make sure you clamp the fuel line all the time except just before starting it.

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08-12-2009 11:47 PM  8 years agoPost 8
MickeyMoo

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Ohio

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I disconnect the line at the filter to fuel the engine so its not getting flooded. Also, its hard to turn over with no fuel or glow lighter. Unfortunately even with the biggest starter out there the one way bearing in the clutch seems to be the weak link

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08-13-2009 01:14 AM  8 years agoPost 9
BJames111

rrElite Veteran

San Diego, California

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The most popular starter these days is the Dynatron, although I'm still surprised that your Hobbico 90 is struggling so much with your 70.

I use a super cheap Mavrikk starter, and either 14 nicad cells 1500mah, or a 5S 3300 lipo. Works every time on my YS91Sr, it also starts the OS91HZ no problem.

Most of the time it comes down to voltage. A 3s lipo with the hobbico starter will not work. That's LESS voltage than your 12v L/A battery! A 4 cell or 5 cell lipo will typically start any heli engine.

I did a little checking after we got off the phone today, and the OS70 did have pretty high compression and was usually a bit harder to start than other engines, but I just have a really hard time believing that a 4s lipo and the Hobbico 90 won't do it.

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08-13-2009 03:56 AM  8 years agoPost 10
jschenck

rrProfessor

La Vista, NE.

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but I just have a really hard time believing that a 4s lipo and the Hobbico 90 won't do it.
I agree - if the battery can maintain voltage under load the 90 starter should be able to fire it with a 4S pack.

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08-13-2009 08:23 PM  8 years agoPost 11
jkraptor

rrNovice

APOLLO XI

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OS 70 START PROBLEMS
I utilize a Dynatron 12/24v Heavy Duty starter with two 3s lipos in series. This produces the 24 volts and I can guarantee you, it will start ANY HELI ENGINE in the 70+ class!

Got to stay focused! Warbirds are making too much noise!

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08-14-2009 12:59 AM  8 years agoPost 12
MickeyMoo

rrApprentice

Ohio

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I just have a really hard time believing that a 4s lipo and the Hobbico 90 won't do it.
The hobbico 90 and a 4s pack will turn it over. However the wand was slipping at times and the starter was pulling 55 amps. It didn't take long for the starter to start smoking. The next day I tore up the one way bearing in the clutch with my 18v drill. At this point I'm thinking of going to a hobbico 180 and a 4s pack. I should have plenty of voltage\torque and the starter should be able to take teh amps but I will still need to loosen the glow plug so I don't mess up the bearing in the clutch. Maybe another 50 flights down the road it will loosen up enough so I'm not tearing up bearings. Hard to believe the OS70 could give me this much trouble and guys with 90s are fine Once again, after its started, its great

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08-16-2009 04:02 AM  8 years agoPost 13
craheli1

rrNovice

Northern Cali

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check helidirect new align super starter http://www.helidirect.com/index.php?switch=1

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08-18-2009 07:20 PM  8 years agoPost 14
MartyH

rrProfessor

USA

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I use a Dewalt 9.6V cordless drill. I dont notice anything partuclurly high compression about a 70.

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08-18-2009 09:31 PM  8 years agoPost 15
jkraptor

rrNovice

APOLLO XI

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STARTER
As I indicated before.....Stay away from Hobbico and get the DYNATRON HEAVY DUTY. It will outlast your Heli ! Unless $ is an issue, you will not regret it.

I used to manage Zoom's and I can't tell you how many Hobbicos I returned, including two of my own. For a few extra dollars, get the best on the market for trouble free starts on anything.
Guys at the field borrow my starter for their 90's, because their Hobbico won't start it.

Got to stay focused! Warbirds are making too much noise!

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