Biglen

My Feedback: (5)

I've just bought a 3W 212 B4 QS engine and would like some opinions on which TOC Extreme Yak I should put it in. I was going to go with the 170CS in a 37.5% but the 4 cyl sounds so sweet but 3 lbs more. Should I go with the 121" or the 129" wing span? Do these planes balance ok with a 12 lb engine? Does anyone have any experience with 212 B4?
Any info appreciated.

bubbagates

My Feedback: (32)

I know this is not the plane you are asking about but I just watched this engine haul around the 3.3M Comp-ARF Yak on tuned pipes and do it really well so I would say the 40% TOC/SD would be the better choice as it's very similiar in wing area

Torqued-Up

My Feedback: (16)

It will not balance on a 37.5%, period... It will be nose heavy on a new version 40% SD Yak... 12 lbs is a lot of nose weight to counter-balance... My newer version 40% SD Yak balances perfectly with a 8.5 lb engine... AUW is 45 lbs...

That's if you can find a 40% version... I've been told that they are technically out of production, but SD will build them if the factory gets an order for 10 or more from a dealer... Chief or Troybuilt may still have some in stock...

Hope this helps...

Biglen

My Feedback: (5)

Thanks for the info, where are your batteries etc mounted? Can I shift stuff back to get it closer to balancing? Also the 212 is 3.58" longer than a 3W 157. What is the distance from the firewall to the front of the cowl? Can I shorten the firewall to recess the engine more?

Marcelo Assis

My Feedback: (3)

If I were you, I would go with the Aerotech 40% YAK 54.
John can give you a very good suport and you can order it as a KIT, ARC or ARF.
Go to www.aerotech-rcmodels.com
Take care
Marcelo Assis

adrian-RCU

ya the 40% with that engine will be a super sweet combo - that sd 40% is a good flyer aswell

flying skunks

My Feedback: (7)

I would go with the 40%er,the Aerotech 40% Yak balances out great with a DA 150,plenty of power with pipes and 2 blade prop.
Donnie

flying skunks

My Feedback: (7)

Here's a pic of an Aerotech Yak,has DA 150 and pipes,believe weight is 42lbs.
Donnie

Torqued-Up

My Feedback: (16)

Moving the firewall back is not a problem as there's plenty of room to cut the motor box and refit... This would help with the CG issues also...

I have all my batteries mounted as far forward as possible... You can easily move the batteries back 3 feet to further help CG... I'm using a Seiko servo on rudder and it's mounted right behind the pipe tunnel... Again, moving this servo as far back as you can gets your CG back even more...

I think you could get it to balance... You will just have to be creative... It should be awesome...