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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Gasser Head speed???
02-08-2006 02:04 AM  12 years agoPost 21
AGRAV8

rrProfessor

Mosquito Coast......Houston Texas

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See above
Yep

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02-08-2006 04:07 AM  12 years agoPost 22
motoxxx996

rrNovice

fillmore california u.s.a.

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Ok that make sence, I only did one loop and got spooked when it hesitated. I did not prime it before the flight because it starts fine with out primimg, I didn't know that there was another reason to prime it. Next time I fly I will prime first and do more than one loop or roll and see if the problem persists . Thanks again all.

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02-08-2006 04:15 AM  12 years agoPost 23
rbort

rrProfessor

Franklin, MA - USA

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Report back
Make sure you report back and let us know. Would be good to hear how you made out!

And, ALWAYS make sure you do your first loop or roll up high giving you room to complete the maneuver and auto down safely in case it quits. Its only susceptable to this on the first couple of loops/rolls, and, once you get by those you can do anything you want. Not saying its going to happen, or that its going to die. Chances are it won't. But IF it ever did, be safe and high on the first flip -- that is what I do -- in other words NEVER take off and roll right to inverted on your first flight, as you could be inviting trouble...Wise words if nothing else!

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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02-09-2006 04:49 AM  12 years agoPost 24
motoxxx996

rrNovice

fillmore california u.s.a.

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Thanks Raja I will for sure let you know how it goes. I'll take your advice and take her up nice and high before I roll her over. I can't wait to get out and fly again, so far it flys like a dream! I think my nitros are in danger of collecting some serios dust these days. Mark

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02-09-2006 05:55 AM  12 years agoPost 25
ddavison

rrVeteran

Brownsville, Pennsylvania

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I had the same thing happen to me when I was flying the gasser SE, did everything that I could think of, all the things that were suggested here and still it would do the hesitation/burp/hiccup occasionly, usually after the first loop, roll, flip, tumble. Just when I would get a good flight/day of flying the next time it would do it. So I learned to live with it, did as suggested go up do a first loop/roll get it overwith then keep flying, sure got my attention at first and the attentions of other fellow fliers.

DaveDavison,GasGob,WhiplashGas,Spectra,JRXG11MV,12X

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02-09-2006 01:04 PM  12 years agoPost 26
AceBird

rrElite Veteran

Utica, NY USA

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Crazy fast!

You guys are crazy fast with the rotors.
I put mine at 1800. going to creep up till I see 1950 or vibration if any comes.
Doctor please, this is a very dangerous approach. You could be perfectly safe at 2000 RPM but you don't know and you never will until catastrophic failure.

It takes very complicated computations to predict when the system will fail. Doing it empirically on your own is a no, no. The max RPM attainable decreases over time because of fatigue ... especially carbon fiber.

Workload over time ... be careful.


Ace

Ace
What could be more fun?

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02-09-2006 02:31 PM  12 years agoPost 27
Dr. Fibinotchi

rrKey Veteran

Sioux Falls SD

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hmmm....
Ace

I agree that it 'could' after years of hard 3d break down the blade, but the sab blade can run up to 2k and I have heard of only one guy breaking a blade in flight and it was ms710's by curtis. Most of us never see years on a blade for other reasons...lol.


I have given thought to the 1950. It wont make as much sense with my engine and gear ratio. 1850 should be my iddle up2 and should work just fine. It does help in 3d and no one wants to lug the engine especially when the engine and gearing dont make sense at lower rpm. Ride the max torqe). With diffrent engine and gear combo I wouldnt hesitate for higher rpms with my setup.

There are two spots on my bird for resonance and vibration problems can occur. The bird tells you what is going on you just have to listen.

-Cody

If you want others to be happy, practice compassion. If you want to be happy, practice compassion.

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02-09-2006 02:36 PM  12 years agoPost 28
rbort

rrProfessor

Franklin, MA - USA

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Rotor speed
My policy is, if you are flying and you are happy, turn whatever speed you need to get that. Turning faster than necessary only puts more wear and tear on the machine, burns more fuel, and doesn't accomplish anything in my book. I've been flying for many many years as most of you know over 1500 flights, and here are my points:

a) if you are hovering you can hover at 1500, 1600, 1700, or 2000. There is no difference as you don't need that extra rpms when you are sitting still. Go with the slowest speed that works, and besides, who wants to be staring at a screaming heli right in front of them. It just seems more dangerous and it could be.

b) if you are flying around, go with a faster speed to get you to loop and roll at a respectable rate. Again, whatever speed is necessary to acheive your goal and flying style. That may not necessary be the fastest speed the machine can turn the rotors.

c) If you are flying hard 3D and want the max performance, then at that point you may want the max speed the machine will do or the max speed you are comfortable with. That being said, I would use this speed when necessary and when you break out of hard 3D and go back to just cruising around I would drop it back down, but that is the way I do it.

I just don't see the need to be screaming full speed when you are not using it. Sure if you are banging the sticks around and showing off to your friend, go for it. But alof of times I see people fly full speed all the times and 1/2 the time they don't need it as in a) or b) above. Again your choice, just my thoughts.

Lastly, if you hover your machine and say you turn off the gv-1 so that the throttle is not limited. Go to idle up and make a full power climbout gradually moving the collective to full (like 2 seconds to get there). Have someone tach the ship on the way up. After several tries you will find that your machine will "top out" with max collective at speed X. Lets say that is 1800 rpms with full throttle max pitch with your engine and pitch curve. That means your engine can handle a maximum of 1800 rpms with the full pitch. If you set your gv-1 to run your machine at 1900 or 2000 rpms, then since the motor is not capable of maintaining those high rpms under load you are going to bog and drop rpms in a maneuver. No sweat right? well sort of, as when you drop rpms your tail rotor effectiveness changes and the tail can swing back and forth as you vary your head speed. When you unload the disk it will build back up to 2k, but, in reality it can't sustain it.

On the other hand if you choose to run an rpm which is LOWER than the engine's max performance, then you have some reserve power left over and this will minimize if not eliminate bogs. You get as MUCH more consistent run and not much rpm changes to speak off. In essense your flying will be alot smoother, more precise, and more enjoyable to watch.

Check out the video of the Vario Acrobat (recent post) and you can see the bog and head speed changes. There is a video here of my gasser from a while back and I haven't watched it lately but chances are there isn't much bog on this one. Its about 3/4 way down on the page:

http://www.augustoheli.com/videostu...ous/default.asp

So yes, you can run fast rpms, and you can be OK but keep in mind that if you are doing so you are using it and not just screaming rotors for nothing.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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02-11-2006 12:18 AM  12 years agoPost 29
gid01

rrNovice

Southampton, England

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I second demotion with Raja. That's what you call Engine Management

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02-19-2006 07:10 PM  12 years agoPost 30
motoxxx996

rrNovice

fillmore california u.s.a.

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Ok boys your suggestions did the trick! I took the gasser out today with the new longer looped vent line, that worked fine no spilled fuel while flying. The bigger issue was the bogging that I encountered when I rolled inverted. I pumped that little prime bubble several times until I didn't see any bubbles in the lines. Up we went, I flipped rolled tumbled every way I know how and not once did it bog or stumble. Thanks for your suggestions they cured my little problem. This was the first time I cut it loose a little and had some fun flying the predator, what a great flying heli! I couldn't be happier with it. Thanks again guys.

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02-19-2006 07:52 PM  12 years agoPost 31
rbort

rrProfessor

Franklin, MA - USA

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Ya man!
Glad to hear it!! Gassers are KING

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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