Pattern Prop
 

I admit that I do not know the difference between a pattern prop and a regular prop. Would someone please enlighten me?

Regards,
Jerry

RE: Pattern Prop
 

sure it's actually pretty simple. APC calls the props that are normally used in pattern, pattern props. theses normally have a high pitch. you can use them in whatever you want, same as you can use a regular prop in pattern.
in other words it is a label and nothing else

RE: Pattern Prop
 

Thanks for the quick reply. I guess that I won't be looking all over for those any longer!

Regards,
Jerry

RE: Pattern Prop
 

what size prop and brand do you need?

RE: Pattern Prop
 

Agreed "pattern prop" is a label...however it's a label with a few implications.


Google search found this write-up on Central Hobbies web site....

"Just as model airplane engines aren't all alike, so props vary quite a bit in quality and durability from make to make. When choosing the best prop for your plane/engine, you should keep several factors in mind. Plane size & weight, airfoil, thrust-to-weight-ratio, engine rpm, brake horsepower, and other factors, like the use of tuned pipes to boost rpm & torque, are handy things to consider when selecting a prop size."

"The nature of Pattern flying demands agility in maneuvers, proper control of airspeed at all times, fast response, and good thrust. Matching the right prop to your engine and plane will make a big difference in every flight, in every maneuver. While engine rpm and a prop's angle of pitch will have a lot to do with the plane's speed, the prop's diameter and pitch will determine the rpm. Power, speed, and control should be balanced out, which means that, for the happiest results, the plane and the engine and the prop need to be properly matched."



Although this is targeting glo power...same thought process also applies to electric power.

RE: Pattern Prop
 

Don't need another prop, was just curious. I have a Venus II with a Saito 125 and am running a 15x8 and am thinking about a 16x8. Power is good, but do not have unlimited verticals, but they are more than adequate. The plane seems to fly slowly, but has plenty of power for loops etc. I am very new to pattern and am still trying to get the plane trimmed out.

Regards,
Jerry

RE: Pattern Prop
 

My definition is that the "pattern" prop will allow you to fly the plane in a constant speed under various wing condition, and to able to fly your sequence with that speed.

Its pitch is usually around 10-12 for glow engines based on people's experience. The diameter is determined by the engine.

RE: Pattern Prop
 

All the things the others mentioned plus one thing no one else has until now....In addition to increased speed, higher pitches will produce a noticable difference in noise output by the engine-exhaust system-prop combo. Same is true for electrics. One thing certain, the more noise you hear the greater degree to which power is being converted to noise rather than thrust

12" pitch (for varying diametrs) seems to be a magic pitch for pattern airplanes. A very good balance of thrust, speed, brakes, noise.

Suggestion, rather than increasing diameter to 16" and maintaining pitch at 8", consider increasing pitch to 10" on your set-up. Don;t know if the Saito 125 can haul a 15x10 tho, so you should experiment a little or get input from a better flier at your club that uses that set-up. The other thing to keep in mind is that 4 strokes benefit greatly from higher nitro so the 125 could haul the 10" pitch with more nitro, possibly

RE: Pattern Prop
 

I had a 15x10 on my Venus II when it was powered by YS 110. GREAT performance, but was a bit much for that engine on 20% nitro.

I would try it on the 1.25 with higher nitro content.

RE: Pattern Prop
 

I have used a cut-down 15x10 (actually 14.5x10) with YS110 on Venus II. Good power and speed.