Patty can be balanced even with 160 fx on the front. You can use one rudder servo or go for a pull pull or put the battery in the engine box and get rid of the 12 oz. This will change the performance drastically. The evo58 is not the same weight with zdz50 it is about 1 lb heavier. I think it is the better choice for power with 1 lb weight penalty however one should see the flight performances with a both for a sound comparison. BTW do you get 8.5 hp with a tuned pipe? Which prop do you use? My friend have a zdz80 on a comp-arf 2.3 extra and he can not get 8 hp with 26x10 bolly wood and pitts mufflers. If this engine is that powerfull with stock mufflers than it would be a the first choice for all airframes designed for 75-80 cc engines on the market.
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Alp
alpsat,
I agree in that the Patty can be balanced with your suggested changes, and I am working in doing so this winter. You are correct in that the ZDZ 50 is "advertised" at 3.37 Lb. " with all flight hardware, Ignition and plug", and
Approximately5 HP output. Static thrust /HP "calculated from actual engine data and
ThrustHP 2.0 (@ 29.92 in. Hg.)". The ZDZ Super 80 is "advertised" at 4.2 Lb.
bare engine, and 8.5 HP, "calculated from actual engine data and
ThrustHP 2.0 (@ 29.92 in. Hg.)". No information provided as of type of muffler, and or propeller size.
On the other hand the Evolution 58, which is the exact same engine as the MVVS 58 ( see:
http://www.mvvs.com/mvvs/58cc_gasser.html ), "advertised" Weight - 3 lbs 12.7 oz, RPM - 7,000 using a 22x12 prop. My engine actually weight 4.75 with ignition and plug (no muffler). The MVVS factory published dynamometer data showing an output of 6.8 KW
( 9.1 HP), no muffler or prop data. Horizon Hobbies, is more conservative and advertises the 58 output at 8.5 Hp.
As you can see is extremely difficult to navigate through all the manufacturers’ claims of weight and power. They "all" want to make their products (engines, and aircrafts) look as the lighter, most powerful, and with the highest performance. Disregarding the manufacturer’s hype, if we take their data at face value the 58 still looks like the better powerplantvalue for your dollars, even for 75-80 cc class airplanes. This coming IMAC competition season will prove if that’s realistic or not, since there is not much experience with these new engines.