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Esprit Model . Thunder Power RC . Real Raptors

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Gasser Model RC Helicopters > XL gas
 
 
vulpiSenior Heliman - Location: PARIS -
I flew with my gasser today and buddy box with my friend and his eclipse 7.
I put BIll neddle setting on it , it was on the riche side before, now it run really smooth with good power.
What kind of pitch are you runing on such heli +10/-10 sound ok ?
I had too make some carbon tail fin as my vertical one broke from vibrations :/
My laft landing gear rail broke at rear at all the screw .
I sont now how this happened , maybe because when i start it i put my feet on landing skid on this side ?
Also my tail gear box went out in one flight causinge some map piro,i hit hold and saved the heli quite well , it was close to ground when happened , but thx to those 710 it autoed very well.
The gear box slided out the boom slowly then rudder went totally out inflight.
I put a screw that secure now gear bow to boom.
Anyone know if any of the carbon landing gear rails for SE or pro will fit gasser frame ?

Thats all i hope to enjoy and tune my XL even better , thats and awsome ship!


02-25-2003 Over year old.
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

things to do

Sounds like it wasn't built quite right. There is supposed to be a screw in the tail rotor gear box to secure it to the boom. You can even put two (one from top, one from the bottom) to secure it further if you like.

As far as the landing gear brace breaking. Its caused from vibration. Make sure your fan is balanced well. Also, the stock motor may be out of balance. The best solution is to balance what you can as best as possible and then to use the JR rubber isolation spacers between the landing gear and the braces. This way you will never break a brace again or the landing gear struts even if you crash.

Pitch range of -10 to +10 sounds good. should be -5 +5 and 1/4 and 3/4 stick for 3d stuff. use the carbon fins that Min air has. The plastic ones are too brittle in the cold and if you hit the ground with the tail fin it can break right off. I only owned one set of plastic fins and once they broke I replaced them with the lightweight carbon fins. 0588-9 and 0588-9 I think. Those will never break unless you crash, and even then they can survive.

Enjoy!

-=>Raja.
02-26-2003 Over year old.
 
 
reefguy
Senior Heliman
Location: palmdale california

rbort

question, on your fin breakage, i flew my gasser yesterday, landed regurlary, then the top part of the fin broke, no hard landing whats so ever, since i have to replace mine, do you know if the carbon weave are any good for x-cell gassers? or should i stick with the v-fin cf fins the ones you mentioned.. thanks.
03-04-2003 Over year old.
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

carbon fins

Hi:

I would expect that any carbon fin would be fine for the gasser. Its a matter of choice as far as which one. The only thing that isn't good is plastic, as it doesn't hold up well.

-=>Raja.
03-04-2003 Over year old.
 
 
vulpi
Senior Heliman
Location: PARIS

Funny how your fin broke same as mine , top part of vertical fin.

As for carbon i just took some plate and did same design as stock plastic ones , works perfect here.
03-04-2003 Over year old.
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Fins breaking

You know, my plastic fin never broke like that however a local guy at the club kept putting the bug in my ear that plastic fins are brittle and as soon as I landed rough in the cold weather and caught it in the ground it was going to go "ping" and snap off. Due to that I was careful with it and it last a while until one day I went to Maine for the weekend and took the heli with me.

I was flying it over a construction sight with a local flyer there when suddenly the engine quit. What? I was caught by surprise as he was yelling drop the pitch and I did to let her fall out of the sky. As it came closer to the ground I added pitch to make the landing but it ended up landing behing a small "hill" in the construction dirt just out of sight. We ran over there to find it in one piece, but guess what, the fin was broken in half. The tail, out of all places, landed in a tire track rut and it must have caught the fin causing that "ping" sound effect and breaking the fin.

After that, I bought carbon fins and have been using them ever since (I'd say for about 5 years now). Carbon fins will never just break, you have to crash and crash on them to break them, otherwise they live well on the gasser.

Oh yeah, by the way the dead stick was caused by the fuel line slipping off the tank nipple on the outside of the tank. A quick trip to the hardware store bought me a plastic squeeze clamp that solved this problem for good. Make sure you clamp your line there otherwise as the fuel line tubing ages it can slip off unexpectedly.

-=>Raja.
03-04-2003 Over year old.
 
 
Cotonaso
Heliman
Location: Sonora, Mexico

Pipe

Hi, I have been looking fot a tuned pipe for my X-cell gasser. I liked the one in the picture, does anybody know where can I get one in the US?
Thanks
03-04-2003 Over year old.
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

BH Hanson

Bruce Hanson sells tuned pipes for gassers or g23's rather. You can go to his web site at http://www.bhhanson.com/bhabout.htm

Here is the link to the tuned pipe:

http://www.bhhanson.com/hbprod6.htm

Enjoy and tell him Raja says hi!

-=>Raja.
03-04-2003 Over year old.
 
 
vulpi
Senior Heliman
Location: PARIS

If you are looking for good performance go for stainless steel , no aluminium pipe.

IT work much better resonance wise , on the hotter gas engine.
My little muffler you can see here in the pic was stainless and had very good performance and ppl came to me asking if it was 4 stroke , it is really quiet.
The bad thing i broke the home made header on it :/ i had to put the stock muffler ,such a POS , i could make the engine bog in a stall turn with it , it had no power on climb out and the engine looked like it wanted to quit after each throttle up.

Its also a but more louder at idle ,
iam waiting infos about the bergen muffler , but i think this one too will be from aluminium.
I need to carry some load (aerial photo) and i want max performance of my setup.

How do you know the high needle is set properly anyway ?
My engine seem to always slow down at full pitch with any setting , and iam running 710mm at +10°

With stock mufller it doesnt seem to handle that pitch and look like the engine will quit after full climb out ... any hints here ?

Thx, and have fun.
03-05-2003 Over year old.
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

engine bogging down

You got too much blades for the engine and pitch settings.

If you fly 680mm blades, you can support somewhere around 10.5 degrees on the top end at say 1700 rpms.

If you fly 700mm blades, then the top pitch will drop to +9.5 degrees to support 1700 rpms.

If you have 710mm blades, then naturally +10 is too much degrees. Of course if you put a tuned pipe on it will increase the engine power and hence you can support more pitch.

I personally use the Min Air rear can muffler (the one that tucks in behind the frames), and I use the governor on the machine. With 700mm blades, this is what I had to do.

For 1500 rpms, I have +10.5 degrees and I can turn that all day.
For 1600 rpms, I have +10 degrees and the engine maintains that.
For 1700 rpms, I dropped the max pitch to +9.5 degrees to maintain the 1700 during the full power climbout.

Basically use a sky tach on the ship and have someone tell you if you are maintaining rpms at full power, or just listen to it if you don't have one. The rule of thumb is, the faster you want to turn the blades, the more work on the engine so you need to drop the pitch a bit to maintain a good balance. As the blades are turning faster, you will still climb out at about the same rate even with the less pitch.

When I was using 680mm blades, I had power to spare and I was +10.5 degrees on all three rpms. In that case I probably could have ADDED pitch to say +11.5 for 1500rpms, +11 for 1600, and left the +10.5 for 1700. However, I like the bigger disk for extra lift and more hang times on the autos, so I just dropped the max pitch a bit to keep the engine happy.

For you, either use a tuned pipe to increase the power, or drop the max pitch on the higher rpm settings to prevent the engine from bogging down.

Good luck and enjoy!

-=>Raja.
03-05-2003 Over year old.
 
 
vulpi
Senior Heliman
Location: PARIS

Thanks great infos here ,
I think you are right iam running 710 blades and thats pretty big , i will try to fly +9 pitch tomorow and see how it work.

Still the diference of power output with stock muffler versus pipe or tuned muffled is amazing.

Thx , have fun.
03-05-2003 Over year old.
 
 
reefguy
Senior Heliman
Location: palmdale california

tuned pipe

how much did that pipe cost complete with all hardware? thanks.
03-05-2003 Over year old.
 
 
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Gasser Model RC Helicopters > XL gas
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