RunRyder - Does YOUR Sceadu overheat?

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HIROBO Freya - Sceadu - Shuttle > Does YOUR Sceadu overheat?

kencb
Heliman
Location: High Wycombe, England

The first time i run my Sceadu with a OS32 SX H engine. I was only running in the engine at a high tick over with a well rich mixture, lots of smoke, it cut out. I picked it up to examine the problem and the heat from the engines was amazing, i couldn,t touch it, not even the needle. I made a shroud and it cured the problem. I had several flights now and leaned it out a bit now its run in and its fine.

12-16-2001 Over year old.

MitchD
Senior Heliman
Location: Antioch TN USA

Over heating

Hakim,
You Emailed me several months ago,and I gave you a list of things to go thru,you e mailed me back and said you had gone thru your setup and your freya and sceadu were flying better than ever,what happened???????
Footnote: adding a headshim will not help a overheating problem,all it does is change the volume of the cylinder to help with detonation problems and a few other things too involved to go into here.
Theres also a difference between an engine overheating and running a engine lean,2 sets of symptoms.OS carb adjustments should be made in small increments(1 to 3 clicks max) on the high needle and 1/16th to 1/8 turns on the idle mixture screw.its The fact that a lot of guys dont mess with the idle needle is the cause of a lot of tuning problems.
A lean engine will go lean in flight,then when its brought down into a hover(if it didnt flame out)it will start to run rich or what seems normal again(on a engine using a muffler not a tuned pipe)
A overheated engine will start to go lean then when brought down into a hover keep getting hotter and hotter till it seizes,dies, or flames out ,whichever comes first.
Footnote: I had a discussion with a good source on heli engine information a while back and he brought these symptoms up as being the 2 most common pertaining to heat problems,or whats thought to be heat problems,and i totally agree.There are many other factors to consider but these 2 seemed to be the most common.
My point is before you blame the design, look at the rest of the "big picture"
My cent and a half

12-16-2001 Over year old.

HOMEPAGE

hakim
Heliman
Location: Mombasa, Kenya.

Hi MitchD,

Yes, I thought I did have the engine running well for a time there until it died on me and I found out that the heli doesn't auto so well. Broke the landing gear and put the heli in the corner of the room in frustration. Took it out again a couple of weeks to try out new ideas.

I've been flying it the last two days with some more changes and with the new shroud on it. As of yesterday I managed to get nearly twenty minutes of hovering and small circuits, just taking it easy. I love this heli, it handles so well. After landing the engine seems fine even though I'm not ready to remove the shroud just yet.

I did more adjustments to the low and high neddles and also removed the filter in between the muffler and fuel tank. I also readjusted the throttle/pitch curves. So lets see.....I feel like I'm seeing the light at the end of the tunnel now.

Thanks for all your help. You guys are great!

12-17-2001 Over year old.

Monty_Burns
Heliman
Location: Sunny South West England (Yeah right!)

Sceadu 30 Overheating

My S30 used to overheat in a bad way - the engine got so hot that the head turned the same colour as the crank case (it was gold - it is now a gunmental colour). I replaced it with a previously run in ABC (These are both Irvine 36's btw - overheating is easily done in these engines).

Got the head speed up to 1600 and she flew dead cool for a whole 30 minuites in the hover.

I also fitted a Quick UK fan which has 9 fins instead of 8 - and also a shroud. - This was prior to my engine change.

I think this overheating problem is a myth - after all Hirobo are not stupid, and with all the other engineering development in this machine they are unlikely to miss such an obvious problem. That would of definately shown up in many more cases had it been a proper bug.

04-18-2002 Over year old.

HOMEPAGE

Monty_Burns
Heliman
Location: Sunny South West England (Yeah right!)

Sceadu 30

The shroud on the Sceadu is definately too big for a 30 size engine, I can't even see why Hirobo did not think to extend the shroud to fit over the head of even a 50 size. Cost does not seem a big factor, although precision complex frames such as those used on Hirobo machines and other plastic helis are very very very expensive to design and mould - an extra few inches from the front could do no harm - also there are mysterious holes in the shrowd on both the left and right sides - there are no nuts to undo here - another cost cutting measure I suppose.

NHP make a nice piece to fit on the front and act as a shroud- it also stiffens the main frames, though I would recommend a 3rd bearing block to stiffen before the shroud.

04-18-2002 Over year old.

HOMEPAGE

SemiArticulate
Veteran
Location: On Location

This thread has been a relief to me as I continue to float the Sceadu 50 to the top of my list for my next heli. But are we sure we are looking at this right? If the fifty already has plenty of power, are you guys sure your not running it a little on the rich side? Would better cooling not allow for even better performance? Maybe most don't need any more performance with such a high power to weight ratio already? Maybe there is no more performance to be gained? Has anyone tried using a 50 setup on another brand of machine that ran perfect and then stuck it into the stock Sceadu 50? Any needle changes?

Sorry for all the questions but I tend to beat every issue into the ground and beat all the reps over the head before finally putting my money down.

04-19-2002 Over year old.

Greg Takacs
Veteran
Location: Fort Worth, TX

This one is definetely a dead horse

But seriously, not too long ago there was a thread asking for OS50 needle settings for the Raptor and some stated they run it with factory setting on the mid range and one turn on the main needle. My Sceadu is 2 clicks in from one turn on the main needle and factory setting on the mid range. So I'd say I run it as lean in the Sceadu as others in something else. It has yet to overheat and I am pulling 11 degrees of pitch with 600mm blades so the power is there. I have not used the engine in another heli, but from the above poster(I am too lazy to look up the actual thread) seems like that they run it with similar settings in the Raptor as well.....

04-19-2002 Over year old.

HOMEPAGE

SemiArticulate
Veteran
Location: On Location

That sounds good enough. So has anyone seen any benefit to the shroud or fan upgrade or should I just not worry about it?

04-19-2002 Over year old.

Monty_Burns
Heliman
Location: Sunny South West England (Yeah right!)

Fan

I upgraded to a 9 fin fan from Quick UK and have not had any problems. I also changed the engine though - but the airflow has definately increased. The Sceadu uses the exact same fan as the newer Shuttles.

I recommend just for piece of mind

04-19-2002 Over year old.

HOMEPAGE

moose
Senior Heliman
Location: Somerset UK

I am running an OS32 in my Sceadu plus Quick UK fan and NHP shroud. Over the last six weeks I have been having lots of engine problems (the couple of months prior to this the engine was fine), some of these were solved by changing plug type (originally an OS no 8 now an Enya no 3), changing fuel lines (the last one was a few days ago when I found small splits in the pressure feed), carb strip down (I found the mixture barrel had rubbish in it the same as Volkul had with his 50) and finally fitting a header tank. The engine has a tendancy to lean out in mid tank (even with the header fitted) for 4 or 5 minutes and then go rich again.

Even with the engine running very rich, it gets VERY hot, on Wednesday I could feel the heat through the canopy !! The engine has never quit or blown a plug, it just gets very hot. Yesterday I transplanted a knackered 5 year old OS32 into the Sceadu and once it was set up I hovered a whole tank (just to make sure all was OK) without any problems at all. At the end of the flight the engine was hot but no hotter than it was when it was in my Hawk and certainly a lot cooler than the original engine was.

The next step is to put the Sceadu engine into my Hawk and see what happens there.

I have only used OS engines for the last six years, in planes and heli's, and this is the first one that has ever caused me any problem. The only difference with this engine is that I purchased it from a well known heli only shop in the US during a business trip last year, but that should not make any difference to how it runs, unless it is home sick !!

Before my engine problems started the overheating was not evident so the two may be linked in some way.

As it looks like I need to replace the original engine that was in my Sceadu I am off to meet the Hirobo distributor's rep shortly to see if I can get my hands on one of these new Hirobo 36's to try out !!

04-19-2002 Over year old.

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HIROBO Freya - Sceadu - Shuttle > Does YOUR Sceadu overheat?

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