Originally Posted by
gmeyers
I have had, in the past, planes that were to big for the available .049's but not quite .09 sized so I was delighted when the .074 queen bee came along and I bought one. I was a little disappointed in it's performance so bought a Norvel .074 and also the Purple Top Thunder Tiger .074 and did side by side comparisons - The Norvel won hands down for many reasons so I bought 5 more of them when I spotted one on E.bay.
I bought a Queen Bee too, when they first came out. Then got busy with work and family. Put it on an ARF foam plane, had difficulty with runs and thus sidelined it. Later, was told should have changed the plug. My 1966 OS Max .10R/C certainly wasn't fickle and a much more user friendly engine, plus more powerful and lighter. Good reason why I have 3 of the OS.
Originally Posted by gmeyers
I found quickly that the Cox Queen Bee used the same threads and dimensions as the TD .09 and the only difference was the size of the crankpin. So I made a bronze bushing and sized it to fit the TD con rod and press fit it in place and turned my .074 Queen in to an .09 King. It performs much better as an .09 than it did as an .074. The larger cylinder bore didn't save any weight and I learned over time that teflon reeds also made a difference in performance.
You turned bruised apples into apple sauce.
Yes, I wondered why basically an underbored .09 cylinder, since it is heavier. I think that if Cox made it an exhaust throttled .074 with a postage stamp type back and with .049 tank spaced mount lugs, shorter lighter crankcase, or even made it a reed valve .09, they might have a lightweight decent upgrade for the .049's. The carb screw slots were split on my nylon carb mount, so I bought a new one from Ex Engines.
Originally Posted by
aspeed
I made up a turbo plug head for the TTiger .074 and it equalled the Norvel. I think the Queen Bee muffler needs the outlet drilled bigger. Kind of hard to do.
I think that if Cox had made it use an exhaust throttle muffler instead that allowed one to adjust the amount of muffling might have been a better choice.
Originally Posted by
Pond Skipper
Per my last vid using thrust calc it makes way more power than a TD .049
Static: 5x4.5 / 20429rpm / 11.3oz thrust / .172hp / 128w / 87 mph
Mind you I did use a Profi tuned pipe = )
That puts the Fuji .05 Schneurle then in the .09 cross scavenge power class. That's about the power of the 1965 Enya 09-III TV.