ZDZ180B2-J champion

[Notorious B.E.N.]

Any horsepower ratings on this one yet?

 

[Flyrcjoe]

Any horsepower ratings on this one yet?

The horse power is rated at 20. The prop recommendations from the factor are stated to be two bladed 32/12, 32/14, 33/12.

 

[Flyrcjoe]

Second flight of the ZDZ 180 in the Comp Arf yak

 

[dhal22]

Any horsepower ratings on this one yet?

A lot.......................

 

[Terryscustom]

A lot.......................

I was going to say that or "more than anything else in this size", but I didn't want to be the first.

 

[Jlc]

I have some questions about the rear carb. An engine this size does it weaken the firewall cutting a hole that size for the carb? Are you guys cutting holes in the fuselage for needle adjustment?

 

[Notorious B.E.N.]

With this being a rotary valve motor, do pipes still increase power or do they not have any effect?

 

[jamesrxx951]

With this being a rotary valve motor, do pipes still increase power or do they not have any effect?

If the port timing is right a rotory can make huge power on pipes. AKA Seadoo 785cc engines had to compete in the 1200cc class of jetskis racing.

 

[lowdown]

There was a guy on the other site years ago when the Super 80 came out and he tested pipes and the power output was incredible on that particular size engine.
I had one on a Pitts muffler in a Wildhare 40% Giles and it was also unreal power.

 

[Terryscustom]

I have some questions about the rear carb. An engine this size does it weaken the firewall cutting a hole that size for the carb? Are you guys cutting holes in the fuselage for needle adjustment?

No, most ARF's are built with 3/8" aircraft ply firewalls and if you are building a kit you can use material to suite the job. It's more important to use a fender washer on both sides (or wide base standoff on the engine side) with any engine install to keep the pressure spread out and not crush the wood. I put a 90 in an EF MXS and had to cut out the hole large enough for the entire carb.....zero issues. On the ZDZ180 I have the firewall placed so I only use 1/4" standoffs and will install the carb after the engine is bolted on, that way the hole is actually quite small that goes through the firewall.

With this being a rotary valve motor, do pipes still increase power or do they not have any effect?

I'm not a pipe expert but I am on the lookout for some used or cheaper composite pipes to try on my 112. Looking at the testing done by others they make gobs of power on pipes an with the rotary valve it all but eliminates the "peaky" feel.

Even without pipes the rotary valve promotes super smooth non-sputtery operation which I'm really liking so far.