RCU Forums - View Single Post - Does the increase thrust of a 3 bladed make up for the decrease in rpm?
Old 07-14-2015 | 05:23 AM
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gregoryshock
 
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From: Goshen, IN
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This is just an update. I'm not trying to argue with you guys. I just felt like telling you what is currently going on.

Due to CG balance issues, and Taxi Tests, my Dad feels that we should stay with 14x7 three bladed propeller.

I ordered some different propellers to try. 2 of them should arrive tomorrow. When I get all of the propellers, I will have 14x7 three bladed, 13x8 three bladed, 14x6 two bladed, and 13x8 two bladed. I already have both the 14x7 and 13x8 three bladed. What I noticed is, the plane balances with the 14x7 three bladed, but is giving me fits to balance it with 13x8 three bladed. Since most people (online) seems to be telling me that I should fly the corsair 60 with a 2 bladed propeller. My recent goal has been to balance the model for the two bladed. The biggest reason why my Dad feels we should stick with the 14x7 three bladed is because even before I reach 1/3 rd throttle the tale starts to come off the ground and the plane seems to be getting light. It skips across the grass runway and acts like it's getting ready to fly! Master Airscrew says on towerhobbies that the 3 bladed "creates a greater thrust at a lower RPM". When I originally posted this thread, I didn't know that they made that statement.

Bax says "Start with a 12 x7 or 8 or 13 x 6 or 7" Of course since this is going to be my first flight I don't want to try anything stupid.

Links:

I started a CG Balancing Thread:
http://www.rcuniverse.com/forum/ques...ggestions.html

Link to my Question to Bax:
http://www.rcuniverse.com/forum/o-s-...eller-rpm.html

Links to the propellers:
http://www3.towerhobbies.com/cgi-bin...&I=LXAA40&P=ML

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXAA39

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXZ980

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXZ981

* In case your wondering why I bought the 13x8 three bladed, my local hobby shop suggested it. Then He said, if I still have doubts then go to the 2 bladed.