View Full Version : Newbie Questions! installing OS55 on TTX50
09-28-2010, 04:38 AM
I am building my first heli, it is Thunder Tiger X50. I have already assembled the head and now working on the main body. Its time to install the engine, here are my questions...
1- I should NOT use the crankshaft washer that came with my OS 55Hyper and should put the fan on the engine shat without it?
2- I will have to take out the back plate and use a toothbrush to lock the crankshaft at TDC then tighten the fan. Should I use threadloack on the shaft and fan?
3- Should I use threadlock for the crankshaft bolt?
anyother thing I need to be careful about at this stage of assembly?
Is there any build thread or video on ThunderTiger X50?
Thanks in advance!
09-28-2010, 01:18 PM
definately use thread lock on all metal to metal screws/surfaces, especially in the engine. i cant tell you anything specifically about this heli, other than it looks sweet from what ive seen of it! keep posted on the build...take it slow and ask questions..
09-28-2010, 01:59 PM
1 - No washer
2 - No threadlock on the fan. Lightly oil the part of the crankshaft where the fan screws on.
3 - Yes, threadlock on the crankshaft nut. Don't hold the fan when tightening the nut.
09-28-2010, 02:07 PM
I don't know, what your experience/ skills with nitro-engines are, but to use an OS-55 as a newbie (honestly) is a bad choice because engine tuning will be more painfull . Today's latest nitro helicopter builts get ever lighter and this means an OS-50 is still a very powerfull - but way easier - engine?
Most people having a 3-needle carb and discussing how to tune the needles.. have no clou about that .. so, considering you bought an OS-55 (don't get me wrong, it's a good engine - except the metal bearing cage), find yourself an experienced buddy helping you to tune especially the main needle:thumbup:
Sure, 90' size engines have 3-needles, but it's fact, the bigger the displacement, the easier to tune an engine (anyway). My post is not to scare you, but to tell you to find advice/ support by skilled people. The +10% increase in displacement are a good example that some companies develop far around what 80% of people need :arggg:
So once again, don't be scared, but search advice by experienced people. I know about engine tuning, but honestly it's pretty difficult to explain to a newbie how to tune an OS-55, meanwhile explaining a someone how to tune an OS-50 is cake .. :hug:
P.S: On our flying field most novices choose the OS-50.. it's very easy to tune and as well very easy to xplain to anyone how to tune the needles, especially when you use a temp monitor. Sure. Some people will say, no problem to tune an OS-55, funningly the web is over-loaded with people asking what the middle needle is for and how to tune it?
09-28-2010, 11:37 PM
Thanks everyone for replying!
This is what I did!
Engine main shaft -> Fan hub+fan -> washer (that came with the engine) -> main shaft nut (came with the engine)
Raptor30_V1, thanks for your advice, though I am new to the nitro helis and nitro heli engines but I am NOT new to the nitro engines all together. Used them for about 3 years on planes before switching to petrol engines.
The next step is choosing the battery regulator! I will be using the following electronics
Futaba 6008HS receiver.
Futaba BLS541 cyclic servos
Futaba gy520 gyro with JR 8900 tail servo
Any recommendations on the regulator??
10-04-2010, 01:06 AM
There are many different regulators that work fine. At the high-end (price) you will find a SG Reactor-X and at a cheaper (fair) price you can buy a Perfect-regulator 6V/ 5V (for the tail) for about USD 39.- ..
I use 3 Perfect-regulators 6V/ 5V but you can have this regulators as well for higher Volts and even adjustaeble. Up to now I'm very happy with my regulators, no glitches/ brownies etc. .. just working fine :thumbup:
P.S: Tuning a plane-nitro is not the same as a heli-nitro-engine. :confused:
10-04-2010, 04:06 PM
The X50 and OS 55 are a very powerfull combination. I suggest you go easy on the collective range. Maybe max 11 deg to start with, I am running 13deg with 620mm blades and with the engine tuned properly the machine goes WAY harder than any other machine I own or have had. Power is good but to much and you can get into trouble real quick. Kind of like learning to drive in a 500+hp Car.