RunRyder - RAPTOR 50 Thinking of replacing my TT50 motor

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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 50 Thinking of replacing my TT50 motor

moy71
Heliman
Location: Sydney, Aust.

Am thinking of replacing my TT50 motor. For my kind of flying (hover and general circuit flying only) i am thinking of getting the OS50 SX-H although there seems to be favourable reviews for the new TT53 redline engine.

Which would you recommend? will my existing stock muffler work with both OS and TT? Also will both slot straight in without any mods?

Many thanks.

06-01-2008 12:59 PM

ROGER543
Heliman
Location: bristol ct usa

tt 50

any thing wrong with the current 50 you have?? If more power is needed then yes put an os hyper but if your not looking or needing more power than just keep the 50 you have until you get better or find your self needing the power. Yes your exaust will work with either engine. Have you tried to go up in nitro % yet?? 30% put out more power and easier to tune than let say 15%.

06-01-2008 01:38 PM

moy71
Heliman
Location: Sydney, Aust.

Actually I don't need more power. In fact my flying style is very docile - rarely go 3/4 power or higher.

My titan was second hand and I find it quite unreliable lately. I had it tuned properly by my local hobby shop to make sure that all is well. However, just yesterday while hovering about 1 foot off the ground, it lost power. Luckily it just settled nicely back - horror shock if it happended higher up.

But the funny thing was even though the motor lost power, the motor WAS actually still turning. In other words it would still respond to my throttle. its like the motor was idling at HALF-STICK throttle. Of course once I did lower the throttle to idle, the engine would die out completely. All this would happen randomly - sometimes at the beginning of flying (full tank) sometimes 30mins into the (like yesterdays case)

All fuel and clunk lines are brand new. The glow plug is practically new and glows very bright when I plug it in the glow-starter. I am already using 30%nitro, 22%oil. But my hobby shop strongly recommended I drop to 15-20% nitro instead as 30% does not really suit my type of flying with the added benefit of cheaper fuel.

As you can see, I'd rather not leave anything to chance and would prefer to buy a new engine outright.

However, I am open to suggestions before I give up completely on the TT50 engine.

06-02-2008 12:38 AM

jschenck
Elite Veteran
Location: La Vista, NE.

This sounds like the typical mid-range lean issue that plaque's these engines. Try richening the idle mixture up, probably need to go a fair amount. This will make it idle rougher and probably need to add idle trim to get it to idle but may help the mid-range lean issue. Ultimately you will probably want to modify the main needle by putting it in a hand drill and sharpening the end to a finer point. This will allow you to lean out the idle but run a richer mid-range.
You could also replace the carb with an OS carb, or just replace the engine with an eaiser to tune OS-50. But I'm still playing with my TT-50 because when it runs right it's very miserly with the fuel.

Also once you have it tuned right and are more comfortable tuning yuo may want to consider the 15% fuel. It will run longer a tank of fuel but will be a bit more sensitive on the needles.

...yep...

06-02-2008 06:08 AM

kmaxphil
Heliman
Location: Prince George,B.C.-Canada

Had similar issues with my tt50. Too lean mid. if richend up the idle would be so fat it wouldn't idle. Did the mod jshenck reffered to and it runs sweet now. idles very reliable and low rpm. The mid range seems to be fine. wouldn't give up on engine it just needs a little modification.

06-02-2008 11:37 PM

moy71
Heliman
Location: Sydney, Aust.

Quote
This sounds like the typical mid-range lean issue that plaque's these engines

This makes sense. So what I am experiencing is the fact that when in hover (half-stick,) the engine is leaning out, thus overheating, thus losing power.

It would also explain the fact that in idle, the smoke is nice and thick and as soon as the high speed band is reached, the smoke is minimal.

My local hobby shop tech probably riched the low-end needle so much to compensate for the leaning at the high-end.

My main worry now is the fact that if my engine was leaning out, I may have already damaged it???

I'll try the needle mod as there's no harm in giving it a go before I throw in the towel on the TT50.

Will advise result soon.

06-03-2008 12:11 AM

JKMRS
Heliman
Location: Czech Republic

Never had any issue with my TT50 nor spent much time fiddeling with the needle settings. I just started with a very rich setting - running in - and went from there to leaner, a bit at a time.
Just changed it for a TT53 Red Line and the swap was really painless, it's a drop in replacement. Same exhaust (MP5)too.
More power, and the same easy tuning. Easy, because I am not (yet) trying to push it to the maximum : I am still practicing my loops, rolls and cuban eights : no 3D for me!
Even though I am a die hard OS fan, I'd recommend it.
Just note that the fuel consumption is a good 50% higher!

good luck!

06-04-2008 12:52 PM

moy71
Heliman
Location: Sydney, Aust.

JKMRS, you mentioned that you have the MP5. I just ordered it today myself. I was 50-50 on getting the MP5 or the Zimmerman but got the MP5 instead as the Zims were always out of stock and not readily available. So how does it compare with the stock TT muffler?

I read somewhere that the TT50 motor is not the best at handling 30% nitro which is what I am running it on. It works best apparently 15-20%. However, if you must use 30%, then the needle mod is the way to go. I assume you were using a nitro content lower that 30% when you still had your stock TT50?

I made the needle mod last night, it was pretty simple to do with a dremel and a fine file.

I started it up after work this evening and it idled up first attempt. Not bad, couldn't really start it that easy previously. Couldn't really do much else due to rain and too dark. Can't wait to find out the result of the mod this weekend when I do some real flying. But I must say, it is looking good judging from that first attempt.

06-04-2008 01:29 PM

JKMRS
Heliman
Location: Czech Republic

MP5

I bough the MP5 at the same time as some hard dampners and light paddles, so whe I took off the heli felt different alltogether and it's hard to say how much the MP5 was responsible for. This said, power increase was noticeable, but nothing like what I had expected from reading some posts : "awsome" "unbelieveable power" etc, etc...
It's good, but the major, visible change, came from the TT50/TT53RL swap.

you're right, I don't use fuel over 30% nitro, only 15-20% shared by all my flying things - planes and helis. I'll keep the "needle mod" in mind the day I start, thanks!

Jk.

06-10-2008 01:27 PM

TwistedRotor
Senior Heliman
Location: Tulsa, OK- USA

Sounds like you do the same flying that I do. I'm on my 3rd gallon of 30% with my TT53 and it still puts a smile on my face every time I start it up. I chose the 53 over the hyper because of the hypers bearing problems and the 53 was a couple bucks cheaper. It's also red and it matches my paint scheme.

Besides it's a Raptor, it just seemed fitting to put a TT product in it.

The helicopter is a machine trying to commit suicide,our job is convincing her to fly...

06-11-2008 02:54 AM

StillTryin
Senior Heliman
Location: Perth, Western Australia

The "needle mod" is done on the low speed needle, not the main needle.
It helps tuning++ making the TT50 a well behaved engine.

06-11-2008 10:04 AM

moy71
Heliman
Location: Sydney, Aust.

It works!!!!

Finally got the chance to fly my Titan after the needle modification.

All I can say is WOW.

I confirm what everyone is raving about after doing the mod. Its like a totally different engine. The best thing about it is now I can actually see smoke trails from the exhaust - something i never used to see. heck initially i thought something was on fire. it was unbelievable. had to lean the main needle about 1/4 turn. i've now witnessed what RICH is like.

I imagine the turns on both needles will not be the same for everyone as it will depend on the amount of metal you shaved off the idle-needle during the mod process. My main needle is 3 1/4 from closed, and the idle is only about 1 turn from closed.

BTW, the OS50-hyper i ordered arrived yesterday. Its still in the box, probably remain there until the TT50 packs it in.

06-11-2008 10:33 AM

toner123
Heliman
Location: norfolk, va

wel i am glade to see you got it working. never heard of that trick so ima have to write that down never know when someone else will come up with the same problem but once again glad to see you got it working

06-14-2008 07:43 AM

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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 50 Thinking of replacing my TT50 motor

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