Raptor engine OS 32 Problem

[s007]

Hello,
Wanted to ask how come when i press throttle hold which is set to Idle at 0.0% when engine started the blades needs to be hold quite hard from stopping them spinning and engine set with servo just about 1-2 mm from fully being shut (now as you know if i try to make it even less it wont start), Now when i change throttle hold setting to say -0.5% or -1.0% the engine wont even start or if it does it will cut off by itself in couple of seconds.

What am i doing wrong how come starting engine in minimum from being cut off by itself just by 1mm makes blade holding hard (well not hard just have to hold them or they will trat spinning straight away) Is there any other setting i need to do so engine will kick off and work and blades will spin but at minimum like i sore in most youtube vids when ppl start engines.

Regards,
Sergey

[Jamez]

Check your bottom end needle, if its too lean it will cause the engine to race at low throttle settings, and it will wipe the engine out very quickly. Check that the throttle is actualy closed by poping off the ball link on the throttle leaver. It might be that the servo / push rod, are not set up correctly. If this is a new engine, I would recommend have the low end needle rich enough so that you get a small amount of unburnt fuel in the smoke, until the engine is run in. As I believe the 32 is an ABC, they need a little more care during the running in period.

[s007]

Sorry im new in this any chance you can show me in the pick where this needle is and how do i adjust it.

And yes i have checked and throttle does close the engine fuly once i press Throttle cut so servo arm is set up properly.

Cheers,
Sergey

[s007]

Just need info on that needle adjustment.

Regards

[steelie600]

http://manuals.hobbico.com/osm/32sx-h-manual.pdf

[David Drew]

What I find with my OS37 is that I have to up the throttle trim a bit to get it started, then back it off to an idle. My clutch alos bites at a fairly low RPM but I just back off the tickover till it stops biting.

Try using the throttle trim to make all those fine adjustments.

David

[del19_82]

David that wont work if he is using throttle hold. I dont use throttle hold when im starting my raptor, as the os32 in it is kind enough to cut out sometimes so i need the throttle on to keep it ticking over, especially if its cold or it is its first start of the day!!!!

[steelie600]

just a thought why are you using throttle hold to start a nitro??????

[David Drew]

David that wont work if he is using throttle hold. I dont use throttle hold when im starting my raptor, as the os32 in it is kind enough to cut out sometimes so i need the throttle on to keep it ticking over, especially if its cold or it is its first start of the day!!!!

Ah....I never use it, so ignore me. I took it as a starting problem. Must read post better first

[del19_82]

lol i had to look twice as well

[s007]

OK that what is said in the manual of OS 32 Engine by the way iTs ABC:
1. Be sure to use a muffler pressurized
fuel feed. Use the same fuel
as you intend to employ for actual
operation of your model. Open
the needle-valve 1- 1/2 turns.

2. Open the throttle fully, and turn
the engine using an electric starter until the fuel is
seen to reach the carburetor. Fuel may be drawn to
the carburetor more quickly by choking the exhaust
outlet with a finger, while operating the starter.

3. Do not continue to choke the exhaust after fuel has
reached the carburetor.

4. Now reset the transmitter throttle stick to the closed
position, keeping the throttle trim lever set at the
advanced (i.e. idle) position.

5. Hold the rotor head by hand so that the rotor
cannot rotate when the engine is started. Also,
steady the model with a foot on the landing-gear
skid.

6. Connect the battery to the glowplug and start the
engine by applying an electric starter.

-----------

Now does anyone try to start the engine this way especially the part when you start with out glow starter?? sounds silly to me.

And from what i understood does that needle responsible for adjusting the RPM? So i can play with it when throttle hold is on at idle, engine started - to stop the blades from spinning at that time?

[marktigere1]

I always use throttle hold when starting my Raptor.

I couldn't when using an OS 8 plug but I have gone back to the trusty Enya 3 and as a pont of safety always start with throttle hold.

No problem.

Mark

[Mike W]

Always used throttle hold here and adjusted on the trims till it run ... Everyone is diff I suppose tho ... Be a dull world if we all did the same lol .....

Reason ya turn it over with finger over exhaust and no glow plug on it is to prime the engine .. Normally found that if ya do it till it just starts to go into ya carb then ya have less chance of a vapo lock on it ....If ya look in the OS manual it tells ya the needle settings for base ...

As for needles for playing with the tick over ... Put the low end adjustment needle to factory settings and use ya trim rod length till ya got it to tick over ... Idle mixture screw is always last to adjust after the main needle ....
Little tip to find out if ya got it set right when its run in ....
For main needle .. hover it and get engine to temp , bring it down and put ya finger on the backplate .. shud be able to hold it comfy on it for bout 5 seconds ... if too hot richen ( turn anticlockwise ) ... If stone cold , lean off ( turn clockwise ) few clicks at a time till its done ....
Low end ... Pinch the fuel pipe to the carb and see how it behaves ... It shud after about 4-5 seconds rev up and try to die ...If it runs on longer than this then it is too rich and lean it off ... if it dies right away its too lean so needs richening a little
Always remember when doing n e thing like this to ya engine ... Few clicks at a time and then run it in a hover and bring it down to give the settings time to take effect .... OPr ya be hunting high and low to set it up

[Jamez]

The low end needle on the OS32 is a small scew tucked up inside where the throttle linkage attaches ( you should use a watch makers flat head screw driver to adjust this ) I would personal richen this up by an 1/8th of a turn, start the model and see what happens, if it still race's away try going a bit richer, until you get a healthy amount of smoke, and maybe a trace of unburnt fuel in the exhaust cloud. It is essential that you run this rich until you engine is run in. You may even have to up your throttle at idle to get it to tick over once it is set right, I would also go a little richer on the main needle than it says in the manual for the running in period, better safe than a blown piston / liner etc etc.