prop size for most pull: .75 glow
03-23-2008 | 11:16 AM
#2
RE: prop size for most pull: .75 glow
Break it in with an 11x6 a little bit rich and let it scream. It should be screaming and smoking a LOT out the muffler at wide open throttle. 12x6 is too much load for break in. You don't want to place a heavy load on an engine during break in. That generates a lot of heat. HEAT kills engines. High RPMs won't hurt it. Keep it under 15,000RPM and let it scream.
If you want maximum thrust, then use a large diameter and very small pitch. I use a Pro Zinger 13-5 prop for 3D where instant thrust and acceleration are what I want most. I don't want SPEED for 3D. I want instant thrust.
If you just want to go fast, use an 11x8 or 12x8 or 10x10
General sport prop 12x6 -- 12x8
LOTS of different props to use. Depends on the application. What do you want to do with it?
If you want maximum thrust, then use a large diameter and very small pitch. I use a Pro Zinger 13-5 prop for 3D where instant thrust and acceleration are what I want most. I don't want SPEED for 3D. I want instant thrust.
If you just want to go fast, use an 11x8 or 12x8 or 10x10
General sport prop 12x6 -- 12x8
LOTS of different props to use. Depends on the application. What do you want to do with it?
03-23-2008 | 04:31 PM
#4
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From: Poland,
OH
RE: prop size for most pull: .75 glow
For most pull you want large diameter low pitch.
the 13x6 after break in would be a place to start then try 14x4 or 14x5 and see how you like it.
the 13x6 after break in would be a place to start then try 14x4 or 14x5 and see how you like it.
03-24-2008 | 07:18 AM
#6
My Feedback: (1)
RE: prop size for most pull: .75 glow
Prop size equates to the gears in your car transmission. Lower gears give you more pulling power and less speed but use higher engine RPM. Higher gears give you more speed, but less pulling power at a lower engine RPM.
Same as props. The less pitch the prop has, the more power you will have for a given engine RPM but at a less speed.
A 6 inch pitch prop turning at 10,000 RPM will move 60,000 inches in one minute. 60,000 inches in one minute works out to about 56 miles per hour. The same engine turning a 12 inch prop at 10,000 RPM will go about 112 miles per hour. (all things considered, and in ideal conditions.. the plane design may not allow this speed, but this is possible, in theory). But the engine turning 10,000 RPM and moving that 60,000 inches in one minute, as with the 6 inch prop, will have much more pulling power than the same engine trying to turn a prop with twice the pitch. Same as the gears in a car or truck transmission. Cars that are climbing a steep hill will probably switch to a lower gear to get more power to the wheels in order to maintain the same speed. The engine increases in RPM.
CGr.
Same as props. The less pitch the prop has, the more power you will have for a given engine RPM but at a less speed.
A 6 inch pitch prop turning at 10,000 RPM will move 60,000 inches in one minute. 60,000 inches in one minute works out to about 56 miles per hour. The same engine turning a 12 inch prop at 10,000 RPM will go about 112 miles per hour. (all things considered, and in ideal conditions.. the plane design may not allow this speed, but this is possible, in theory). But the engine turning 10,000 RPM and moving that 60,000 inches in one minute, as with the 6 inch prop, will have much more pulling power than the same engine trying to turn a prop with twice the pitch. Same as the gears in a car or truck transmission. Cars that are climbing a steep hill will probably switch to a lower gear to get more power to the wheels in order to maintain the same speed. The engine increases in RPM.
CGr.
