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Gohbee Aviation Stinger 30-90 > New Gohbee 90 setup!

3dee
New Heliman
Location: south east england

Hi I had problems with my 90 when it was new. I got two new 12v batteries wired them for 24v. then got a small fuel pipe lock and put it on the fuel line between the tank and carb. then turn over the engine dry, with the glow on, when it spinning open the fuel line to the carb and it will start. As soon as you stop the engine stop the fuel line again. you will find that the 90 gets flooded very quick. I have also put a second header tank on the other side so that any fuel sent to the muscle pipe has to fill the header first before it floods engine and so found that the first start up of the day was hard and found that oil from the pipe was going back into the engine and into the head and oiling up the plug. So I now hang raptor up on the wall nose high and all the oil comes out of the pipe and so engine is dry to start a new flying day. hope this helps

12-14-2007 11:39 PM

shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Well I don't think it was every flooded because I took glow plug out and turned it over a few times and no fuel came out. But I am not sure if that means it wasn't flooded or not. But I tryed 18 volts and it was doing the same as 12v maybe a tad better but don't think so. But the drill thing works great and I will use that probably for now on because started is burned up probably now after trying to get it started.

My rc site shanesrc.com

12-15-2007 12:10 AM

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ssrobzoom
Veteran
Location: Tn

Double ck and see if the crank nut and fan has come loose. This will cause the crank to drop down and rub on the engine backing plate.

12-15-2007 02:32 AM

3dee
New Heliman
Location: south east england

you will need 24volts to get going to start with later you can come down a bit. or you could use a geared starter made for 90's. I got through three 12v starters before getting a dynatron 24v.

12-15-2007 02:47 PM

shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Well for right now I am going to use the drill since it works without messing with the start over and over. After I run the engine in some I might try a starter again. But I am thinking I am going to go test fly it today. Or at least spoil it up some.

My rc site shanesrc.com

12-16-2007 07:35 PM

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shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Well so far no luck can't get it started again. I am using a drill but battery's maybe low. I am so getting a bit fed up with nitro helis because of engine problems. I have a few electrics and I don't have this problem with them lol. But I will try some more and see.

My rc site shanesrc.com

12-16-2007 10:58 PM

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shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Still no luck on getting it started figures because probably my only day off and only day weather will be nice great. I have 3 helis and couldn't fly either I love that.

My rc site shanesrc.com

12-17-2007 12:13 AM

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Cambo
Senior Heliman
Location: Phoenix, Arizona

shanee86,
IC engines need to turn the speed of idle to really efectivley start. When you flip start something usually you have enough speed with your hand to get the engine to catch. With an electric starter you are actually spinning the engine faster than idle. IMO, a drill is way to slow for starting. I find it strange that your engine has such a high compression that your 12v starter will not even turn it over. I have delt with several .90 2c and 4c plane engines with no problems using a 12v starter.

Good Luck

12-17-2007 02:29 AM

shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

I am not sure why but my 12 volt didn't work. I first tryed and it was binding but then I got that fixed and still no luck. But with the drill the first time I tryed started right up. I am not sure why that is but it doesn't have binding I checked that and can turn it over easy with my hand but my starter won't keep turning if I grip it with my hand. I think it should not sure but it was brand new before this.

My rc site shanesrc.com

12-17-2007 03:39 AM

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3dee
New Heliman
Location: south east england

please listen to me . the OS 91 heli engine is very high compression get two 12v batteries, put a wire connecting neg. of one battery to the poss. of the other and then put your starter on the two points that are free. your starter will not last long but that's the power you need to start it. for long term you need a dynatron starter.

12-17-2007 06:32 AM

FLYINFOOL
Veteran
Location: Cudahy, WI

If your drill has 2 speeds you need to use the faster speed.
On my 18V DeWalt drill on high speed started the engine very reliably for 2 years. The drill on low speed will turn it over fine but not start it.
I am now using a Dynatron on 24V and I think that might be able to start my truck in a pinch.

There are some OS engines that have even more compression than others.
There are many OS 90 heli engines in our club, most start fine with a Dynatron on a car battery. None of those systems will turn over my 90, mine NEEDS the 24V to get started.
You may just have one of those rare perfectly fitted engines.

Jeff Borowski
Gohbee Field Rep
0133TD

12-17-2007 02:35 PM

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3dee
New Heliman
Location: south east england

you might have one as tight as mine was. I started with a drill 18v and after about three flying days it tore off the bolt holding the chuck in and now the drill is no good, the thread was over 5 mil thick. It started backwards while I was still pushing trigger. so be careful while using a drill.

12-17-2007 05:11 PM

FLYINFOOL
Veteran
Location: Cudahy, WI

If it is trying to start backwards that is a good sign that you are not spinning it fast enough. Your drill may have been to slow for reliable starts.
The Dynatron on 24V will spin it a lot faster than the idle speed.
In fact you really need to be sure that you have a good grip on the head because the 24V Dynatron will spin fast enough to start dragging the clutch.
You have to let off the starter to see if the engine started yet.

You really only need the 24V to get the piston over the top the first time, once it starts spinning, 12V is plenty to keep it spinning, and 24V just makes it spin really fast.

SAFETY WARNING
The Dynatron on 24V is known for having the switch contacts weld together on a very high compression engine like the OS 90. Have a plan to safely disconnect power to the starter while holding the head and the starter.
If you are using a start wand that is inserted into the rubber cup of the starter, the start wand will launch at dangerous velocity if you pull it out of the start coupling with the starter running on welded contacts.

Jeff Borowski
Gohbee Field Rep
0133TD

12-17-2007 10:31 PM

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3dee
New Heliman
Location: south east england

the drill was fast enough to start with but as the battery went low that's when it kick backwards so I got the dynatron and the speed of that setup is very much faster as you said, so I always pulse the starter never hold it on for more than one or two seconds at a time. if the fuel is there and the plug glow is good then it starts first time. I still use 24v now the engine is broken in its so easy it starts up instantly. I found it was more of a problem knowing where to have the tick over set for that first time start up than getting it going. The first time I had the 90 I had it set to high and when it did start up it grabbed the clutch and I had got hold of the head so that was the end of the clutch in a cloud of blue smoke. now I know when I set up the engine for a students 90 just where tick over is by looking at the carb. marks.

12-18-2007 07:15 AM

shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Well drill was giving me some trouble getting started but finally got it. I got it started and took it to the field next door and got it off the ground for like 30 secs or so maybe less or more. But the engine was running real hot so it came back down fast. But now I set it at factory settings and will try tommorow again hopefully. It got so hot it would burn my finger on the back plate witch I know isn't good got way hot hotter then I think any my engine ever had and it was only running for at most a few mins. So I am guessing needs to be richened I set it to factory settings and I will see. But if flew great seemed even in trim but didn't get to try long so can't be sure. I think I am going to love this heli if engine runs good because its so stable etc. I was worried about tail spinning etc and all did good great. Oh also the head speed I think is way to high and I am told that is normal I was told just turn in the radio but I not sure how any help? I have the Futaba 6EX 2.4ghz radio and looked in book and no help.

My rc site shanesrc.com

12-19-2007 02:14 AM

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Cambo
Senior Heliman
Location: Phoenix, Arizona

Hi Shanee

Can you restate your question. I think you had a typo there and i am not sure what you are asking

"Oh also the head speed I think is way to high and I am told that is normal I was told just turn in the radio but I not sure how any help? I have the Futaba 6EX 2.4ghz radio and looked in book and no help."

If your HS is high than you can lower your throttle curves in the radio.

12-19-2007 02:52 AM

TDriver
Veteran
Location: Portage IN

Is this your first heli?

12-19-2007 02:57 AM

shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

No this isn't even close to my first heli probably like my 7th heli or something. But I was asking how to turn down the RPM of the head in the radio not sure.

My rc site shanesrc.com

12-19-2007 03:39 AM

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shanee86
Senior Heliman
Location: Oklahoma City, OK, United States

Also the engine turns over great with the starter now. I am hoping that isn't a bad thing. It got so hot that I thought my heli was going ot catch fire lol. I hope it didn't hurt engine it only got off the ground and then hovered a few secs then back down do to lose of power. So more tuning I set it back to what book said and I will see tommorow what it does maybe.

My rc site shanesrc.com

12-19-2007 03:58 AM

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JWatson
Veteran
Location: College Station, Texas

http://rayshelitech.com/osCommerce/index.php

Might be a worthwhile investment at this point.

Good luck,

Jarrett W.

Jarrett Watson
CurtisYoungblood.com

12-19-2007 06:46 AM

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Gohbee Aviation Stinger 30-90 > New Gohbee 90 setup!

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