California Smelly...yak 2

[MarnochS]

Uh Oh Stew,.....trying to confuse a Californian with a bunch of facts are you.........It's all about "looks" in California.......

Quality time with the Dremel tool drum sander.......I'm thinking I might have to make a cosmetic cover over the left exhaust stub ( for "looks" ) so the shark mouth graphic wont get cut out.

[Stew2]

I think the words "looks better" and "Smellyak" don't really go together in the same sentence... but really it isn't about looks, it is about what the aerodynamics dictate for the amount of vertical fin area in the tail is necessary to compensate for the amount of vertical surface area added in the front by the longer nose. So the full scale design did it by lengthening the fuse and adding the dorsal fin. The nose had to be lengthened for balance since the turbo prop engine is so much lighter than the big fat radial. It will be interesting to see if the model ever knows the difference between the two designs. Really cool mods, Scott!! Really enjoy watching the process. Thanks for posting.

[MarnochS]

Thanks Rick,
I was having some problems with my California State Math skills measuring the Z137t graphic on my computer screen and up-scaling....so I made two dorsal fins.......I'm thinking the smaller one "looks" better.

[RickS]

Thanks Bryan,
We both found what little there was....thanks again
I was investigating what I was getting myself into so I did an overlay of the 37a & 37/137t . The tail section is a bit longer on the 137t
Since mine is a "field upgrade" .....my nose is shorter so things don't get too out of proportion.......at least that's what I talked myself into.....
The extended range tanks are pretty cool looking, I found one that had four tanks ( two in the center ). I don't know if I could tow for 4 hours straight...........

You could add the dorsal fin to make it more scale and help with the shorter tail.

[MarnochS]

Hi Mike,
In talking with John Ellias about his AirWorld Z-37 Cmelak, he prefers to fly it without the wing slats installed. Says it feels/fly's kinda strange with them on. I would guess the drag they induce on the model vs. the air flow re-direction is a minus. Sticking with the Winglets though...

Cowl ring installation




Found my old MR Aerodesign build thread for a reference -

http://www.rcuniverse.com/forum/5313957-post54.html

[BryanB]

What would be the cats meow is for Peter to take a break from sailplane design and redraw his Czmelak into a more scale turbo version! Smelly yak III anyone! I'd buy another one!

[ARUP]

It would look cool plus most folks wouldn't know the difference! If they do... then I tell them to build one for me if it bothers them so!!! lol

[yyz]

Super cool, Byran! There's a lot going on with that wing.

[BryanB]

If you built a new wing I could see using the slats but with the thick airfoil of Peters kit it would be hard to make look right as thick as the outboard section already are. Slots would be doable but wouldn't have the same look.

[ARUP]

Scott- ya gotta put those slats or fixed slots on the LEs of your wing!

[BryanB]

Yeah, it was an eye burning adventure doing every variation of search to come up with what little we've found. Short of contacting Zlin and seeing if they'd share some blueprints or visiting an example and taking our own measurements I think we've found what there is.

Great job by the way. Really looking forward to seeing this baby!

[MarnochS]

Thanks Bryan,
We both found what little there was....thanks again
I was investigating what I was getting myself into so I did an overlay of the 37a & 37/137t . The tail section is a bit longer on the 137t
Since mine is a "field upgrade" .....my nose is shorter so things don't get too out of proportion.......at least that's what I talked myself into.....
The extended range tanks are pretty cool looking, I found one that had four tanks ( two in the center ). I don't know if I could tow for 4 hours straight...........

[BryanB]

These are all the best links I could find for this aircraft.

https://www.museum-kunovice.cz/expozice/zlin-z-37tm-turbo-military/

https://www.letadlanaplatne.cz/filmova-letadla/civilni-letadla/stroje-na-zemedelske-ucely/zlin-z-37-cmelak/

http://www.slavetind.cz/stavba/letadla/Z-37_Cmelak.aspx

http://technet.idnes.cz/praskovaci-letadlo-cmelak-09a-/tec_technika.aspx?C=A130628_132746_tec_technika_kuz

https://technet.idnes.cz/bojovy-turbocmelak-zlin-z-37tm-turbo-military-fa5-/vojenstvi.aspx?c=A170620_203359_vojenstvi_erp

[BryanB]

Military version..

[BryanB]

Here's a couple drawings I scavenged off the net. In all my research I was amazed at how little really good info there is for this aircraft.