queen bee 074

I have compared the Queen Bee piston rod vs the 09's
It is a robust engine and can handle some load.
I have ran the QB over 24k rpm in a outrigger hydro race boat
In the air I have found the results of Peter Chinn recommendation of a 6x3 prop makes good use of the engines power curve his recommendations where based on the props of that time.

Today we have the APC 5.75 x 3 gives more rpm but the engine could be loaded more.
Highly recommend the Master Airscrew 5.5 x 4 this prop provides good thrust but most of all makes use of the QB rpm and will allow a sport plane to fly with good authority on breezy days.

You can run a 5x4 all day long on this engine you won't see much benefit of a 5x3 lower pitch can't make up for less thrust from a 5in dia prop.


Here are some of my pics for comparisons and should help steer you in the direction you choose.











Note the weight diffrence and pressure tap on the muffler both make a big diffrence in performance!

Geist , I have one but have not ran it but you may want to ck. this thread out also Kris also knows his stuff on the QB   https://www.coxengineforum.com/t1536-queen-bee-mods-and-performance-thread?highlight=074+queen+bee    Getback

Thank you all so much for all your knowledge and insight on the queen bee! I'll keep you all posted but it seems like I have several projects going on and it starts with me restoring a cox engine then I somehow end up restoring another then I have a drawer full of engines!

Thank you all so much for all your knowledge and insight on the queen bee! I'll keep you all posted but it seems like I have several projects going on and it starts with me restoring a cox engine then I somehow end up restoring another then I have a drawer full of engines!