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HomeAircraftHelicopterBeginners Corner › First flight!
01-17-2009 05:08 PM  9 years agoPost 1
Briliu

rrApprentice

Rome, NY

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(I wrote a lot, again, lol. I have a couple questions at the bottom if you dont want to read the whole thing )

Its 9 degrees Fahrenheit out right now, and it was 5 when I started. I ran two tanks of fuel through it before I had a close call and decided it was time to take a break lol.

To start with, I had one hell of a time starting the engine. It was turning over fine then i "primed it" like i read (cap the muffler spin it for a second. Well that seemed to have flooded the engine, no more of that lol. So my motorcycle battery and starter didnt have the juice to turn it over once I unflooded it, so i had to cart the heli to the garage and crank it over there. Had a hell of a time still, gave it a little gas and spun it up, OOPS too much gas. Im going to have to replace the clutch liner soon i think!

So after getting it to stay idling on the way back out to the flight line in my back yard I spooled it up and took off, holy crap i forgot how awesome that feels Got my training gear on, got about a foot and a half of snow with an inch or so of powder for softer landings! haha

Im tooling around hovering trying to keep it still with the little bit of wind we had, watching the smoke go through the rotor blades. Really freakin cool!!

That was the first tank, second i did a bit of poking around with the tuning (i had it set up to middle on the mixture screw and 1.5 turns out on the needle valve) i started leaning it out a couple clicks at a time, but then it wouldn't transition past idle. It was basically spitting fuel out the muffler the whole time, that's why i thought it was rich (snow was green wherever i took off or idled for more than a few seconds).

I got it to one needle position where the training gear were vibrating WILDLY like 4 inches from top to bottom. I landed that asap and put it back where it was took off, fine, closed it a bit more. Im kinda lost at this point. I think i will just get used to flying before i do any more tuning.

My close call was at the end of the second tank, i landed checked fuel had, about 1/4 to 1/8 a tank. I said to myself, i can make one circuit around the yard! So i take off, go to the left, turn away, come back across the yard turn towards me, JUST before it gets in front of me, the rpm skyrockets (sounded like it, scared the bajesus out of me) and the heli jumps like 5 feet in the air. Im so glad i used the sim for such a long time (like 3 months now i think, every day). I brought the throttle down to like 1/4 to stop it rising, rpm was still crazy high, i thought something broke so i hit throttle hold (im like 15 ft up at this point) heli ROCKETS towards teh ground, because im stupid and the hold and normal pitch curves arent the same, hold and idle2 are (thats already fixed haha), so i bring the pitch back up and have a not so soft but not hard landing on the snow. With my heart pounding and my hands shaking i pull the trim down and cut the engine, stare at the heli for like a minute and then grin and go bring it inside!!

The sim probably saved me a good $100 right there!

That, is my adventure :P I have a few pictures and maybe a video, my mom had the camera out but she was freezing lol. Will post them if i can get them off her computer.

A couple questions:

This is the first take off since i rebuilt it after buying used. The heli's nose drifted to the right constantly at a VERY slow slow speed, hovering, forward flight, ascending, descending, whatever i did. I havent looked into this yet on the internet, but I plan on doing it as soon as i finish this post. That is a gyro/tail/servo issue.

Next problem, POSSIBLY causing the first. Is the whole helicopter has a slow vibration, really just an oscillation that seems like its rocking in a circle. Like, nosedown right down tail down left down repeat, no more than 2 inches at the end of the training gear and maybe 2.5 at the tail boom. It does one complete cycle maybe 2 or 3 times a second. I honestly have no idea what would cause such a slow repeated oscillation. Main rotor is too fast to do that, tail way too fast and not the right axis, engine, WAY too fast. My thoughts are slop in the head because of the cold? I will do some research on this one as well, but please let me know if you have any suggestions or experiences!

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01-17-2009 05:54 PM  9 years agoPost 2
predatorman

rrVeteran

Falkland Islands

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Nah...I would say the RPM can be a factor...but if the whole heli is wobbling about I would say look at the main shaft assy/flybar assy...the RPM could be too low as well...or the dampers could be a bit cold...its hard to say without seeing it.

Congrats on your first flight

its a good feeling, glad you got it down in one bit....that a golden rule!!! if you get a problem with the heli or get too nervous then take a break..and check the heli out if you suspect something is wrong.

Engine tuning is a swine at times....but worth the trouble...once setup you shouldnt need to touch it...save for a click or so on the main needle...this will depend on the weather.

The RPM rise? that could be down to tuning and the fuel level...believe it or not...as the fuel level drops you can get a more leaner mixture. A header tank MIGHT cure the problem as this should keep a nice constant supply in relation to the carbs postion on the heli.

Keep your training gear on for now, I would say to inhibit the idle ups for now...keep life simple...its hard enough flying without flicking switches just yet...though throttle hold is a good idea.

Do be careful and ALWAYS check the heli over after flying...keep it clean too...hot soapy water and a 1 inch paintbrush can get mess off...followed by a hot rinse...be careful where the water goes though dont want to fry a servo

Be consistent with your pre flight check over...ALWAYS check the failsafe...set the collective up...switch the radio OFF and see if the throttle returns to idle or off..keep the collective up and switch on...the throttle should open again.

Check the Gyro function too, I took off once with a sulking gyro...poor heli ended up on its side...... busted

The trick with any sim is to get good on what you are wanting to achieve...but back off a bit in real flying...give yourself time to get used to what you are doing...I gauge myself by nerves...if my heart rate goes up high I am in the groove

Quality takes........time!

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01-17-2009 05:59 PM  9 years agoPost 3
predatorman

rrVeteran

Falkland Islands

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Nose turning all the time? it could be the nuetral point on the tail pitch...set the pitch so there is about 5 degrees or so...servo arm needs to be 90 degrees to the servo...some here might not agree with this for whatever reasons.

The reason you do this is because even on the ground when the rotor is running there is torque....so you need that nuetral pitch setting to counter this.

Set the gyro so its in rate mode..go hover and land and switch the engine off to make any adjustments..screw the linkage rod end in or out as required.

The aim is to hover in rate mode, nose into wind, with no left/right swing.

Quality takes........time!

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01-18-2009 03:19 PM  9 years agoPost 4
Swoop

rrElite Veteran

Newark, DE USA

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If your in heading hold and it drifts, it is almost always a vibration interacting with the gyro.

As for the reving up of the engine, just like predatorman stated, most likely started to lean out due to low fuel. This is more pronounced if your already on the lean side.

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