Absolute Max RPM's on 2 stroke

[Texasmark]

Re: Absolute Max RPM's on 2 stroke

Thanks, Slick looking. Bet they run as pretty as they look.<br /><br />Mark

 

[Boilermaker]

Re: Absolute Max RPM's on 2 stroke

Ya gotta LOVE THE R/C engines>>>I fly a ducted fan Jet and that engine is rated to spin 30,000rpm, although I only have it set for about 25,000. <br />Those OS multi cyl 4 strokes are cool>>I have the Supass .70, but my fav 4 stroker is the YS>>> fuel injected and super charged!<br />LOVE the smell of NitroMethane! <br />Sorry for goin' off subject>>>but he did ask how fast a 2 stroke could spin.

 

[Silvertip]

Re: Absolute Max RPM's on 2 stroke

Are any of you R/C guys old enough to remember the GHQ spark ignition model airplane engine. Yes - it required a spark plug, coil, batteries, and you mixed your own fuel. God my Mother hated it when I fired this thing up in the basement to test run it before installing it in a control-line model. Glow plugs were a blessing when they arrived on the scene. Then there was my quickly made balsa boat big enough to house an .061. Flywheel came from a friction car, drive shaft was a welding rod threaded at one end to accept a prop cut from a tin can and bent to shape. U-joint was a ball point pen spring. Drive shaft tube was a piece of copper tube. Fired it up at the mill pond. No controls just straight ahead full tilt at an oh-my-gosh speed. Hit a log, launched that little puppy about six feet in the air and it stuck in a tree at the end of the pond. What fun.

 

[KCLOST]

Re: Absolute Max RPM's on 2 stroke

I've also run R/C and it's amazing how those engine run... I mainly stay in the .45 class and use mainly SuperTigre engines...<br /><br />I tell you they flat scare me when they are reved up... I always think of all those older gentlemen that helped me learn to fly, and it seemed like half of them had lost at least one finger from all the years of starting those babies up. One mistake of the hand is all it takes...

 

[Dave Abrahamson]

Re: Absolute Max RPM's on 2 stroke

Originally posted by KCLOST:<br /> it seemed like half of them had lost at least one finger from all the years of starting those babies up. One mistake of the hand is all it takes...

That's why I like my electric starter, or at the very least, a "chicken stick". No more flippin' the prop with my fingers. Ever have one knock back on ya? ouchy!<br />Every once in a while, they start backwards too!

 

[Texasmark]

Re: Absolute Max RPM's on 2 stroke

Hey up, you are a real crafty dude. Great imagination.<br />-------<br /><br />I used to use the stick too. The wood props wouldn't hurt too bad, but the plastic ones made me chicken out and go with the stick.<br /><br />But the real bummer, on airplanes, was all the work you'd put into that baby and on the first flight, crash it. Yuck!<br /><br />Mark<br />Mark

 

[Boilermaker]

Re: Absolute Max RPM's on 2 stroke

U.P.S. >one of the guys in my R.C. club still flys an old sparker. Plenty of new gasoline powered sparkers too.<br /> All in all, probably the best power to weight ratio is in those glow engines! Heck, a few years back at the Toledo, Oh R.C. show, a guy was selling scale model glow plug TOP FUEL/Funny Car engines with working Roots type blowers! Mini Hemi's>>>These were used on scale dragsters!!!<br /><br /> My first experience with engines as a kid was the old COX SUPERBEE's... 0.049cu.in. glow engines. Those were reed induction and would spin so fast, the prop tips were supersonic!

 

[Texasmark]

Re: Absolute Max RPM's on 2 stroke

Yes on the Cox. I couldn't afford a rig that big. I thought those 049's were huge and boy when the owner cranked them off, whatta sound. Really wanted one some day.....course to have one and an airplane large enough to accept it just meant more $$$ and heartache when she "augered in".<br /><br />Mark