raptor 30 setup

[simon1]

Hello all,

Tried to fire up my rappy 30 today, and well nothing happened, replaced the glow plug, thats works now, although I have changed the linkage from the throttle servo the carburettor arm, it looks like its winding out of the barrel which im thinking is okay on throttle up.

Reason i have fiddled with the linkage is someone else set the heli up for me to fly and I thought in my infinate wisdom that the arm didn't look at 90 degress from the throttle servo to the arm on the carb. Well it must have been okay, because my heli will not start now.

Going to look at getting it back at 90degreed tmz,
is there anything else it could be? looks like the carb arm is going the right way, but maybe too far, im a bit poor with nitro heli's this is my first.

cheers
simon

[stuskimac]

try starting it with subtrim upped on throttle, when i start my rappy i need alot of subtrim to get it to fire -up ( throttle still in the lowest position ), throttle hold off ! ( yes i did that ! doh) clamps off fuel lines, try not to flood carb.

hope you get it working.

[trillian]

What engine is it?

Generally the throttle arm is open when pushed back toward the tail and closed in the direction toward the front of the heli.

You need to be really sure where the throttle is before trying to start it because you don't want to start with a high throttle setting. It should start at an idle speed but if the throttle is closed off completely the engine will stop. The idle range will be just slightly open from the bottom, just a very small movement of the throttle arm.

The throttle servo travel adjust should be set so it reaches the top and bottom but doesn't try to go beyond those end points or you'll be putting extra strain on the servo.

[simon1]

its the stock 39 pro engine, the carb arm is definately going the right way on throttle up, doing something wrong maybe opening to far and bogging down.

cheers
simon

[Janek]

You didn't happen to "adjust" the high or low end mixtures did you ?

[simon1]

on the needle? no i didnt, fiddled with it a bit when it wouldn't start, but returned it to its original position.

cheers
simon

[chugga-bug]

There's an excellent article on throttle set-up here; Throttle set up
Follow that and you won't go far wrong.
Do make sure the throttles going the right way for god sake!! You'll have the shock off your life if it starts at full throttle! (been there, got the T shirt! ) If you haven't already, get into the habit of holding firmly on the head while starting.
These engines aren't too complicated, so follow that article and you should be OK.

Edit: Forgot to say, reset both needles to factory settings. When you spin it up, does it feel like it's flooding? or maybe it's not getting any fuel at all. Does it pull fuel along the tube to the carb?

[simon1]

try starting it with subtrim upped on throttle, when i start my rappy i need alot of subtrim to get it to fire -up ( throttle still in the lowest position ), throttle hold off ! ( yes i did that ! doh) clamps off fuel lines, try not to flood carb.

hope you get it working.

Hi again

Got the rappy going think I just had too much atv at low stick, so the carb arm was hardly opening on start up and bogging down wth too much throttle stick.

Just for arguments sake though, you owning a rappy yourself, what end point do you have on the throttle servo? I have 110 both sides, although the carb arm is slightly open at mid trim at low stick, and not quite fully open at full throttle stick. Wondering if this is okay? couldnt get it exact very fiddly!!

thanks again

Also im using a jr ppm dual conversion crystal rx, is this okay to use with my ff9, its not dual conversion?
im in ppm mode it looks okay, but makes a hell of a racket, with crackling.
cheers
simon

[electricsceadu]

always start the heli in throttle hold it saves any brown trouser moments

as per the rx you use the jr xtal in the rx dual conversion in your case as its a dc rx
the tx will only ever be one type of xtal no single or dual conversion xtals for the tx
the ff9 will be ok to use on a jr ppm rx
if you go to a pcm rx it must be a futaba one as the jr pcm rx will not work with a futaba tx

[chugga-bug]

Just for arguments sake though, you owning a rappy yourself, what end point do you have on the throttle servo? I have 110 both sides, although the carb arm is slightly open at mid trim at low stick, and not quite fully open at full throttle stick. Wondering if this is okay? couldnt get it exact very fiddly!!

Try a longer servo arm. If you follow the article I posted earlier, you should be able to get it right. You definitely want the throttle to go fully open.
Does the engine have marks on it to show hi/Lo throttle? If not, disconnect the servo rod and scratch some marks at full open, and full closed.
It can be quite tricky getting it spot on, but you only need to do it once.

[gareth08]

Follow this link to a fantastic site for setting up Raptor 30's

The link is to the engine tuning page, but there is a wealth of info on the main pages, if you have a bit of time to sit and read through them. Some great stuff if you're starting out in Nitro engines! (Well i think so anyway)


Beginner Engine Tuning

[simon1]

Follow this link to a fantastic site for setting up Raptor 30's

The link is to the engine tuning page, but there is a wealth of info on the main pages, if you have a bit of time to sit and read through them. Some great stuff if you're starting out in Nitro engines! (Well i think so anyway)


Beginner Engine Tuning

Thats what Iv been on all day!! its a great site though, and at least im understanding it a bit better now, problem im having now is at mid stick, I cannot get my servo arm and carb arm at 90.
Im now thinking I have to take off the arm to the carb and rotate it, because I cant see another way around it. With my servo arm at 90 and throttle arm at 90 its not half way?! its bout 40% open.
Must be the postion of the throttle arm surely?ARRRR!!!!

[Allan]

don't take the arm of the carb take the arm of the servo then move the throttle arm to the mid point then move your throttle stick to mid point then put the servo arm back on the servo trying different positions to line it up to 90%

have look here

[Dedcalm]

I had to move the arm on the carb barrel with my old OS32 to get it in the correct position relative to the servo and engines attitude. They make it moveable to make use of it if required, didn't need to move it with the OS50 Hyper though and the markings on the carb body help determine the carb barrel position Moved the servo arm when at mid stick to be parallel to the carb arm at half open and then used ATV to adjust the servo extremes. My ATV ended up at 110 at both ends so I have linear throttle travel doesnt get better than this!

[Allan]

I set my mates 39 up didn't need to move the throttle arm just set the servo arm same with my os37 I have ATV'S both ends 100