Sign in to follow this  
Followers 0

Yamaha Apex Skytrax Adapters

42 posts in this topic

Posted

I couldnt answer that question. Maybe jim hensel knows this. But until someone really figures out the 2011-2017 wire harness I think I would use the 2006-2010. The wiring and accesories are completely different between these group of years. Part of why the hp increase maybe because of power valves in the exaust which I cant imagine us using. I dont think anyone has even started looking at the later model harness. The good news with redrive options is the cases are the same so if someone ever tackles it we should have a drive

Share this post


Link to post
Share on other sites

Posted

Ok, I didn't realize they were that different. Thanks again for the info!

Clark

Share this post


Link to post
Share on other sites

Posted

Any idea what the installed weight difference will be to a 912 or 914? This is really exciting and I'll be making an engine choice for my SuperSTOL in the not too distant future...

Clark

Looks like Teal answered your question, but I wanted to add that with Steve Henry on your side you have a totally unfair advantage over the rest of us if you end up going Yamaha! 

If his headers, motor mount, and other fabricated parts would have bolted up and fit my KF like they would on a Just firewall I woulda bought them in a second!

Yes, it is great that Steve is really figuring all this out. It is nice to have the FF option from him. I look forward to more flight reports by him.

Clark

1 person likes this

Share this post


Link to post
Share on other sites

Posted (edited)

The EXUP exhaust valves have the same advantage in a snowmobile as do the RAVE variants in Ski doo sleds.  They eliminate the comprimise between giving up low and midrange torque response for high rpm power. With the valves you can have the best of both worlds.  

If you dig deep in that article link it explains that better than I have but for an aircraft application the valves probably would not be necessary or easily feasible to work into a custom exhaust.  That may leave someone with a slightly less responsive midrange but that is less of a neccesity for an aircraft application and the peak HP should still be achievable (with a proper intake and exhaust build) since the valves are in the wide open position at peak HP/RPM.  Again the article explains how better breathing and a change in cam timing help account for the 150 - 162 difference.

I also for sure want to clarify here that wheras the RX-1 adaptation has been out in numbers and proven through some time (the reason I chose it over the Apex), the Apex is just in it's infancy.  Teal will be the first to tell you his prototype must be considered an unknown until it undergoes and passes extensive R&D.  The wire harness on V1 motors has only been modified by a few and the V2 harness is more complex and on the "to do list" as Teal mentioned. 

Reality is that there are only a handful of Apexs out flying so far (most well known being Steve Henry in his "Yee-Haw 6" Highlander) but with guys as smart and capable as Teal, Steve, and Ian I for one have no doubt that any growing pains will be overcome and we will look back on 2018 as the big year for this great engine option becoming available as a well supported and "doable" conversion.

And although this topic is specific to the Skytrax Apex adapter, it is only fair to recognize that this adapter is not the only way to connect a prop to the Apex.  I believe Tango Gyro also makes an adapter and Steve Henry is flying his Apex with a Mohawk Areo (Greg Mills) adapter, Rotax C gearbox, and centrifugal clutch.

 

Edited by Yamma-Fox

Share this post


Link to post
Share on other sites

Posted

This is the front face of the back half after the gearbox coming out of the mill

2018040895185029.jpg

4 people like this

Share this post


Link to post
Share on other sites

Posted

Engine mounting side

2018040895225947.jpg

3 people like this

Share this post


Link to post
Share on other sites

Posted

Shiny!

Share this post


Link to post
Share on other sites

Posted

Beautiful!

Share this post


Link to post
Share on other sites

Posted

New Skytrax gearbox fit up.

20180411_190316.jpg

4 people like this

Share this post


Link to post
Share on other sites

Posted

20180411_194344.jpg

3 people like this

Share this post


Link to post
Share on other sites

Posted

20180411_190654.jpg

3 people like this

Share this post


Link to post
Share on other sites

Posted

I'd feel pretty good about buying and owning something that nice.

Can't imagine how satisfying it would be to have actaully MADE it!!

Congrats Buddy!

2 people like this

Share this post


Link to post
Share on other sites

Posted

Thank you, I cant take all the credit I havent done much of the programming my buddy helped me out with the cnc programming based on my input. 

Share this post


Link to post
Share on other sites

Posted

That is awesome Teal! I'm sure it will perform as good as it looks. Can't wait to hear some flight reports...

Clark

Share this post


Link to post
Share on other sites

Posted

Congratulations! One should really place this piece of fine art on pedestal in the Smithsonian for the many to see. But even better will be the enjoyment of the few lofting them to cool places even though it is hidden under an aircraft cowling. Having had a chance to fly Willis' Fat Avid with the 1.O RX conversion I can't wait to see what 2.0 brings. Looks like it's about time to bring an end to my Subie days here and start thinking heart transplant for Nellie!  

1 person likes this

Share this post


Link to post
Share on other sites

Posted

Initial engine runs are a success!!

20180414_123201.jpg

6 people like this

Share this post


Link to post
Share on other sites

Posted

Congrats - looks really good

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0