RE: Magnum 108 Tuning for more Power
You can get more power by changing the timing on the exhaust and intake and run a tuned pipe, however, due to the poor metallurgy of magnum engines the life span will be short. I once changed the crank timing on a magnum engine with a no.11 exacto knife.
Posted on: 1/7/2007 12:16 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5225359

RE: 18000rpm on a 11x7 prop
[quote]ORIGINAL: abacro Gentelmen, your obviously well read up on things so my question to you is this. Didn't iether of you ever see the hp ratings on the 40 FSR's when introduced? I QUOTE FROM OS " These 40's have more power and thrust then ANY 60 manufactured to date! And as long as i've had mine and flown them,i have NO doupt about that statement. Even to this very date,i haven't found very many 40's through 65's that have the same power! I'll keep flying them till they die,but i'm sure i'll probly pass on befor the 40's do. Keep flying till ya die! [/quote] Put an APC 10/6 on that 40 and you will see what we are trying to tell you. Let us know what your tach results are.
Posted on: 12/30/2006 10:34 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5185371

RE: [b]Would this work in a plane?[/b]
Looking at the bore and stroke it looks like a k&b. Do yourself a favor and get a OS 15 la. It has more power than the K&B 18 and does not have the problems you are facing like the pull start and other problems. BTW an 18 is 3.0 not 2.85.
Posted on: 12/30/2006 9:43 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5185134

RE: Props-More Myths Busted
OS 55ax + Bolly 11.5x6= best combo for thrust and speed.
Posted on: 12/29/2006 12:51 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5178209

RE: New F3D-type Speed-E-plane
Looks like a winner. It will probably only fly about 200 mph. ( at half throttle). I have to see this one fly, the last one you had was scary fast.
Posted on: 12/26/2006 6:18 PM by Author "MyWay" in the forum "Q-40 Racing"
http://www.rcuniverse.com/forum/fb.asp?m=5164452

RE: Fastest Engine
300 ft and sinking.
Posted on: 12/24/2006 8:17 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5157668

RE: Fastest Engine
You might go back and review some of your past post regarding the rpm you were getting with the 91 fx and the 12/8 prop. Have a nice holiday.
Posted on: 12/24/2006 7:40 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5157549

RE: Fastest Engine
What have you changed since the last time you posted readings on that setup?
Posted on: 12/24/2006 7:24 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5157512

RE: Fastest Engine
Might want to check that tach. Mine will only read about 12300 rpm with a 12/8 apc.
Posted on: 12/24/2006 6:52 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5157411

RE: Fastest Engine
How did you get an OS 91 fx to run 16000 rpm with a 12/8 prop?
Posted on: 12/24/2006 6:16 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5157299

RE: 18000rpm on a 11x7 prop
In addition, adding a header with the correct length will add rpm to the non piped engine.
Posted on: 12/22/2006 12:47 AM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5146686

RE: Advice for speed - Jett 40 Sport
Because the SS Jett 40 came with an SS muffler and a Nelson muffler was the only short muffler I had on hand. Worked fine.
Posted on: 12/21/2006 7:29 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5145364

RE: Advice for speed - Jett 40 Sport
The SS Jett 40 is a very strong engine. With a nelson Q 500 muffler it will out run the sport Jett 50 by over 1200 rpm. It will turn an 8x8 9.25 19400 on a good day. Strong engine considering it only a 40.
Posted on: 12/21/2006 3:59 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5143819

RE: 18000rpm on a 11x7 prop
Nuts, you said it not me.
Posted on: 12/20/2006 3:24 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5139912

RE: 18000rpm on a 11x7 prop
Nope. I do know that some Master Airscrew 11/7 props will turn about the same rpm as an APC 11/5. They must be marked wrong.
Posted on: 12/20/2006 12:31 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5139306

RE: More MOney/More Fun??/NOT FOR ME
Who cares what the other person is flying.
Posted on: 12/19/2006 10:35 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5137681

RE: Props-More Myths Busted
In general, thrust at static conditions seem to be only propeller dia. and rpm dependent. Pitch for what ever reason does not seem to provide any more thrust at any given rpm. As to to much thrust, on a 40 size fun fly the rudder was blown off in a flat spin. On a 25 size fun fly the servo gears stripped out in flight on the elevator. The modified OS 28 was putting out 6 1/2 lbs thrust with a 10/3 apc prop spinning 17000 rpm with a jett tuned muffler. The plane was a little over 2 1/2 lbs.
Posted on: 12/18/2006 2:41 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5131114

RE: More MOney/More Fun??/NOT FOR ME
What would you fly if money was not an issue?
Posted on: 12/18/2006 1:54 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5130968

RE: Props-More Myths Busted
Your point about noise and safety are correct. My point about thrust and tip speed I believe are also correct. I have been testing different props and rpms for over a month trying to get something with good throttle response and good thrust. I found out the hard way you can have to much thrust. Still looking for the right combination.
Posted on: 12/18/2006 1:38 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5130908

RE: OS engines overrated?
If the price of model airplane engines kept up with inflation, yes they would quite expensive. My latest water bill was 110$. Could have bought an OS 46 ax for the price of my water bill!
Posted on: 12/18/2006 1:09 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5130816

RE: Props-More Myths Busted
Lets see. A 7.4 inch dia. prop used on a good Jet or Nelson unloaded to about 27000 in the air has a tip speed of about 600 mph. Sure don't look to be inefficient to me.
Posted on: 12/18/2006 12:48 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5130756

RE: Viper & Webra 55
Put a SS tuned muffler on that OS 55 with a 9/9 and a muffler on the Jett 50 and see which one comes out on top.
Posted on: 12/18/2006 2:06 AM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5129498

RE: Props-More Myths Busted
Whats that you say?
Posted on: 12/18/2006 1:54 AM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5129478

RE: Props-More Myths Busted
10/6 at 19 or 20 thousand? Nope, but I have run APC 11/4 props at 18200 on the test stand and the static thrust was unbelievable.
Posted on: 12/18/2006 1:30 AM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5129410

RE: OS engines overrated?
Its not that OS engines are over priced its that other engines are under priced. They are literally giving them away.
Posted on: 12/17/2006 10:30 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5128746

RE: Props-More Myths Busted
[quote]ORIGINAL: DarZeelon [quote]ORIGINAL: MyWay The best thrust can be achieved by picking a prop with a tip speed of about 600 mph. [/quote] [size=5][b]Wrong![/b][/size] That would give you the worst noise, as air-flow around the blades becomes trans-sonic and even supersonic at some points, over the blade-tips. Prop manufacturers limit their permitted RPM, so the limit of Mach 0.7, or 475 mph
Posted on: 12/17/2006 9:50 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5128525

RE: Mini Delta 2000 - almost complete
Sure would like to see that plane fly, but without the plastic spinner.
Posted on: 12/17/2006 9:04 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5128301

RE: The fastest engine for a viper 500
If you want more speed with a 32 in a quickie just clip 5 or 6 inches off the wing tips.
Posted on: 12/17/2006 1:32 PM by Author "MyWay" in the forum "Extreme Speed Prop Planes"
http://www.rcuniverse.com/forum/fb.asp?m=5126690

RE: Props-More Myths Busted
The best thrust can be achieved by picking a prop with a tip speed of about 600 mph. The larger the dia. the better.
Posted on: 12/17/2006 1:18 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5126638

RE: Another Myth busted?
Looks like opinions differ but no one has any facts to back up there opinions. I will make an effort to obtain wind velocities with different pitch props running the same rpm. Can't find any cheap airspeed indicators that will work over 100 mph. Anyone know of a good one that will read over 100 mph?
Posted on: 12/16/2006 12:27 PM by Author "MyWay" in the forum "Glow Engines"
http://www.rcuniverse.com/forum/fb.asp?m=5122541