Wobbles Help please

[trillian]

Hi Michelle,

Good to hear you got the gyro stuff figured out :-)

On the engine issue, it does sound like probably it's too lean. What engine is it?
I used to have an OS37 in my Raptor 30 and never had any problems with it.

Generally speaking these engines will happily run rich and even though they might not
be making the absolute max power when a bit rich, at least it will run cool (ish) and
last a long time.

The Thunder Tiger 39 engines were notoriously difficult to tune from what I have heard
but I also know people that never had any trouble with them.

Make sure all the fuel tubing is sealing and fuel is able to flow freely. There could either
be a blockage where the fuel goes into the engine or a leak where the exhaust pressure
goes into the tank.

[Michelle]

Thanks Dave, I went over to the shop and got a OS 32 SX H-Ringed engine but I am not going to give up just yet.
Hi ya Mrs Trillian, I was well chuffed when I got over the gyro problem with your help only to hit another problem :-(
As I say the heli looks brand new and the engine,, its funny you say the thunder tiger 39 engines are difficult cos thats the one that is in there now.
the man in the shop said, screw the mixture screw right in and turn it 2 and a half turns out,, that should be about right , so I will give it ago tomorrow, also I will change the tank later and check everything as best as I can.

[Michelle]

heli.jpg My problem heli

[del19_82]

The TT39 can be a real PITA to tune so I personally would run the OS32 that you have, its a much smoother engine. My 32 ran quite hot to get decent power but I have been told that this isnt an issue as most OS32's are the same. I can't remember what settings I ran my needles at but it was quite hot but there was still plenty of smoke coming from the exhaust (always a good sign of a non lean engine).

[trillian]

The TT39 can be a real PITA to tune so I personally would run the OS32 that you have, its a much smoother engine. My 32 ran quite hot to get decent power but I have been told that this isnt an issue as most OS32's are the same. I can't remember what settings I ran my needles at but it was quite hot but there was still plenty of smoke coming from the exhaust (always a good sign of a non lean engine).

Yeah in my experience with the OS37 they're never going to run as cool as a bigger engine where you
can hold the backplate and it's barely warm. My 37 did like higher nitro though. I think I was running 20%
and it was happy with that but noticeably down on power when I switched to 12.5% nitro.

[trillian]

[ATTACH=CONFIG]34219[/ATTACH] My problem heli

It looks good! My Raptor 50 has the same rotorhead and tail unit. It looks like the HTR
or Mavrikk.

IMGP1187med.jpg

[Michelle]

Oh nice helis, I bet you do not spend more time on the ground than up in the air like me .
I have a rappy 50 as well Picture 418.jpg, Thats got a OS 50 bule head in it, not sure if thats a SX would have to look.

Hi Del, I am going to give the engine one more go today before I give up and put the new one in,, I have been reading up about the settings and other flyers tend to set it with 2 turns on the mixture screw and 3 turns on the main.
I put another tank on it last night also new tubing,, the back plate screws was all loose and one on the head so will have to see what happens, its a bit to early yet, neighbours will not be to happy if I fire it up now

[Michelle]

Nice are they both 50s and do you fly 3D ?? , where did you get your canopys from if you don,t mind me asking. ??.

[trillian]

Nice are they both 50s and do you fly 3D ?? , where did you get your canopys from if you don,t mind me asking. ??.

Those are both 50s, the other one is an Ely.Q Vision Ultimate which is now converted to flybarless.
The Raptor canopy came from an Ebay shop and it is GRP and was already painted in a nice bright
orange and lime yellow and I added the chequer pattern with sticky vinyl which also came from
an Ebay seller. The Ely.Q canopy is the stock plastic one painted in a pumpkin colour (I bought
it 2nd hand and it was that colour when I got it). I then added some sticky back vinyl sheet for the
silver bit and black and white chequerboard etc.

[SkyCraft]

check glow plug if it dies by itself after idle for few seconds

[Adrian]

Thanks Dave, I went over to the shop and got a OS 32 SX H-Ringed engine but I am not going to give up just yet.
Hi ya Mr Trillian, I was well chuffed when I got over the gyro problem with your help only to hit another problem :-(
As I say the heli looks brand new and the engine,, its funny you say the thunder tiger 39 engines are difficult cos thats the one that is in there now.
the man in the shop said, screw the mixture screw right in and turn it 2 and a half turns out,, that should be about right , so I will give it ago tomorrow, also I will change the tank later and check everything as best as I can.

you might want to edit the mr trillian! as its a mrs lol

[moyesboy]

hi michelle
There are a few common problems that can lead to the engine dying after a few minutes and its usually due to a fuel supply problem.

As the fuel comes out of the tank it has to be replaced by air. Usualy there is a pipe connected to the muffler tht actually pressurises the tank while the engine is running. This helps keep the fuel going into the engine as the heli flies about.

Something that can happen, particualrly on a heli thats been lying about in a garage for a while maybe on its side or something, is the thick gummy exhaust residue can block the connection of the line that connects to the muffler. Then the heli will run for a while but then lean out and die becuase it cant pull fuel out of the fuel tank. Then after it stops it will start again but the same thing will happen. You can try poking things into the muffler nipple to see if its blocked, or blowing down the pipe to check its clear.

something more obvious is checking the exhaiust hole is open. People put bungs in there to stop the mess running out and I often start mine with it blocked and wonder why the motor won't run - but I think you wouldn't really get the motor running if that was the problem!

Another problem is the clunk line inside the tank. Thunder Tiger supply a very bendy and thin wall tube for inside the tank. It has a weight on the end so the fuel pick up follows the fuel round the tank if you fly upside down or sideways etc. This pipe tends to perrish and can fall off, but can also get squashy so when the exhaust pressure builds up inside the tank it squashes and restricts the fuel - then the engine sort of limps along becuase as the engine dies the back pressure drops and the line opens a bit etc. I had this exact problem with my second hand raptor 50. solution is to replace the clunk line with some normal fuel line. It doesn't matter if it seems a bit stiff becuase it goes softer when its immersed in fuel. Make sure you get it the right length so the weighted clunk doesn't catch on the back of the tank.
Problems with this clunk line are usually seen by the header tank emptying - the header tank should stay full until the the main tank is empty.
Its the exhaust inside the main tank (from the muffler pressure line) that eventually eats the clunk line. The clunk line in the header tank doesn't usually suffer.

Please check these things before you rush out for an expensive new engine. If the engine starts up and runs but dies after a few minutes its usually a fuel problem not the motor.

one little extra note - you put this in the forum section for the mini titan which is a 450 size electric heli from Thunder Tiger. There is a section for the raptor here: Thunder Tiger

edit - apologies that some of my points have already been covered!

[Michelle]

Hi Moyesboy, Adrian, I did not know you could edit it so I have just done it and I apologised this morning to her.
I got a new engine last night OS 32 SX-H ringed, But I am trying my best to get this one going cos it looks brand new, I think its fine, just wants tuning, all the pipes seem to be fine and I can blow through the exhaust so thats clear.

Today it would not start at all with the settings, 3 turns on the main and 2 on the low.. it would start with 3 on the low and it ran up nice untill I got to over half throttle so I will tinker with the main cos that for half throttle and over so I have read.

Just incase I have to put the new engine,, can someone tell me how I stop the new engine from turning,, to put the fan on ??...
Last time I put a screwdriver in it but it was an old engine so I was not that bothered.

[trillian]

You have to get a locking tool that goes inside and stops the crankshaft from turning. It looks
something like this; (this one is from Align-Trex.co.uk)

You definitely don't want to put anything in there that can scratch the case or the crankshaft and you don't
want to stick anything in to stop the piston as these are ways to damage the engine. I have heard of
sticking something plastic in the opening where the carb goes on to jam the crankshaft but when I tried
this many moons ago with a toothbrush it just chopped the end of the toothbrush off!

Just incase I have to put the new engine,, can someone tell me how I stop the new engine from turning,, to put the fan on ??...
Last time I put a screwdriver in it but it was an old engine so I was not that bothered.

[Michelle]

Chopped the end of the toothbrush off, Oh my lol,, no I will not be sticking a screwdriver in it or a toothbrush, Thanks for the help Sheryl looks like a trip to the model shop for me tomorrow , weather I put it in or not, I will still go and get one anyway.
Many thanks for all your help guys and gals, very much appreciated