TD pusher prop?

I bought some "DAL" brand propellers for quad-copters.. because their design has more "hub-reinforcement" as well as testimonial to be safe for IC engine use.

I bought sets of their 2-blade 5 X 4's which include X2 R/H propellers and X2 L/H propellers. (ala-quad set-up)

Mark.. they didn't cost an arm and a leg...




This TeeDee style spinner works with my electric-starter.



Consider ordering X2.. which gives you X4 L/H props and X4 R/H props.. a good all-around size for sport-flying.

Eric, I have the MA 3-blade props, but they seem too flimsy.  I also have plenty of the Cox 3-blade props, but I’m not sure if they handle TD speeds well.  I only found one reference to using a Cox 3-bladed prop with a TD, but the poster never said what results he had, only that he was going to try it.  Besides, I’ve always wondered how the thrust differs between the pusher and tractor 3-bladers.  Rev Up props are no longer being made, and anyone selling them are liquidating on hand stock, so no pushers in the range I want.  Zinger has pushers, but the smallest is 7x3½ size, and I have to buy a pack of six.  So I’d have to buy six pusher and six tractor, and then cut down the props to the size I want.  I have the Zinger webpage bookmarked as a last resort.  APC is no help at all, even if I wanted to cut down a prop.

Roddie, I wasn’t looking at quad props, as they’re usually just rated for electric motors.  Those prop hubs look a lot like the Cox designs for the 4" props.  Looking at the DAL props website, I like that the props come in yellow, as I like high visibility props.  Have you flown these yet?  What engine did you get these for?  Where did you see then testimonials?  I guess I’ll order a couple of sets to see how they work for me.

The Slimer Mark

batjac wrote:

Roddie, I wasn’t looking at quad props, as they’re usually just rated for electric motors.  Those prop hubs look a lot like the Cox designs for the 4" props.  Looking at the DAL props website, I like that the props come in yellow, as I like high visibility props.  Have you flown these yet?  What engine did you get these for?  Where did you see then testimonials?  I guess I’ll order a couple of sets to see how they work for me.

The Slimer Mark

Hi Mark, Good to hear from you. I have not flown using the DAL propellers. I bought the 5040 sets to try on my .049 glow engines (Cox engines mainly) after reading a statement made by a DAL company representative, that their propeller "hub-design" will support running on an IC engine. I can't recall where I read that testimonial though.  

Getting back to your OP; I'm curious to know of your twin pusher-engine model..  

I liked the idea of having some 5" X 4" L/H props to try on C/L airplanes set up for them. The reed-valve engines; of which I have a few.. would be candidates. The outward-induced torque-roll helps line-tension. The airplanes would not require as much (if any at all..) thrust or rudder offset. The 5" X 4" is a good all-around size. As you know; I like to design my own airplanes.. and have wanted to design one around Cox's 6" X 2" that was specific to their prolific PT19 Flight-Trainer. Those props were once plentiful but they're getting harder to find.

The DAL 5040 is a 2-blade prop that looks like a comparable-size Cox black prop.

I more recently purchased packs of DAL Cyclone T5046C Pro 3-blade which are designated as 5" X 4"/6" X 3" size..   ..

Here's some images..



Definitely not scale-like aesthetics.. but..



... would look cool on the nose of an Ambush..  just sayin  

Roddie, I wasn't looking at a twin pusher. I was thinking along the lines of an F-82 or P-38. Or maybe even a Rutan Boomerang.

The Asymmetrical Mark