sam answered most all questions.. But just to answer them one more time.. the Nitro helis have a bit more going on in them than an electric. They are totally different monster. When I started into nitro helicopters I had never EVER touched a nitro or fuel powered engine before. so its not impossible to learn lol. If I can learn it anyone can
Push glow / Align 2in1 / switch glow are just differetn on board Glow plug igniters. The nitro engine needs the glow plug to be ignited once during startup and after that, the nitro 2 stroke engine is a self contained system that if supplied fuel through a carb will not need any external electrical or mechanical pulses and will keep running. So these glow igniters give like 5v (i think) to the glow plug, making it hot and when you crank the engine over with the starter, the engine starts, and the glow igniters automatically turn off after a few seconds.. The engine is on its own from there on out.
Switch glow--> you can ignite the glow plug from a channel on your TX.. the push glow or align 2in 1 have a button on board that you press and it tells you either through sound or light thats its igniting the glow plug for you .. go ahead and opent he fuel line and crank the engine over.
As far as governor. Is it harder to setup that electric .. nO.. its the same. Esp with systems like IKON its actually extremely easy. Just like an electric. Like electric motor would need a phase sensor for sensing the rpm, the nitro bird needs a magnetic / hall effect sensor. I recommend to anyone .. use a backplate sensor.. spektrum makes it.. its much easier to setup and just counts how many times the crank in the engine is turning. Then just go in the governor and set up your rpm of what you want and DONE. If you go with some old school ones, then you end up, like electric birds, tach the head speed to set the exact head speed you want from throttle percentages. But why go tehre when you have systems like Multigov pro which i was using since last 1.5 years or now IKON with inbuilt governor system .
Header tank ... Sam's engine is a regulated engine.. it diesnt see a difference. My engine and tony's engine are both simple carborated engines, working on muffler exhaust pressure creating pressure in the main fuel tank to push fuel into the carb making it a closed looop system . The emptier the tank , as you can imagine, the less pressure is gonne be exherted on the fuel thats in the tank.. sO engine tends to come down a bit hot towards the end of tank .
So Header tank is tehre not for more fuel capacity AT ALL! its there for making sure that the carb of the engine is always looking at a psuedo full tank .. (eety beety one) but its full and the main tank could be all the way empty.. helps the engine to not lean out towards the end of flight. People debate over how affective it is... I use it.. It is good

.. is it NEEDED.. Nope.. you can do without it just fine. just keep the engine a click richer than power edge.
There will be a leanring curve in engines too .. just be aware of that

and thats it

>. for me it was a challenge and I LOVE CHALLENGES.. tuning the engine is the hardest part of the whole nitro thing. But once tuned.. you really dont touch it.. almost at all.. till there is adrastic change in weather.. even then.. one click here or there.
you say you have servos.. add to that a Throttle servo .. its supposed to be as fast as the cyclic servos atleast.. or faster.. I use a tail servo on it.
You will need an onboard igniter .. to make your life easier ..
You will need an engine appropriate size for that bird.. 600 size birds fly (OS 50HZ, 55HZ, 55 HZ-r, YS60, Redline 55..), 700 size birds fly (OS 91HZ, OS 91 HZ-R, OS 105 HZ-R, YS120.. ) ..
You will need a muffler tuned for that engine.. Depending on the engine you choose, I would recommedn to go with the right muffler. Like OS55HZ performs THE BEST with OS power boost2 or funtech (same thing) pipe.. OS 50 performs best with Curtis Youngblood MP 5-50.. YS120 performs best with HITORI pipes..
Then you need fuel lines.
A starter. HIGHLY recommend Align starter. I wasted more money on other starters which were half the price, but burnt up.. and bought three before realizing I could have just got the RIGHT thing lmao.
You will need fuel.. depending on the engine.. 50 or 55 size or even 91 engines fly 30 percent nitro. ys 120, OS 105 fly 15percent nitro i think .. so just one of the two ..
Now what FBL you have ? if that FBL doesnt have Governor. .then I recommend Multigov Pro governor. all the headaches of taching the headspeed are eliminated. and with it a sensor.. (recommend Spektrum Backplate sensor)
A fuel pump.. hand cranked will cost like 8-10 bucks.. (US)
And I think thats it.
