Love your inventive touches. You do such a great job describing how you worked on it and explain lots of details. Very impressive Ben! Love, Mom

as a bush pilot I took off over gross when required (more than a few times) - because I burned off fuel so when I landed i was within the envelope. I was aware of what I could and could not do re flying - the kicker was we had a 5000' runway at home base for an easy take off. Not everyone has that...

An Apex on a 4 ought to be a rocketship at close to those weights. Can't wait to see it finished!

Amazing build, can't wait to see this thing in action.

Way to go! The work you and Scott are doing is really amazing

This build is absolutely beautiful. Love the yamaha coversion!

Great work Ben!! I am so glad to see talented people like yourself getting involved with the Yamaha

Awesome! Looks really good. Keep going! Can not wait to see it fly!

Great work! Thanks for sharing! Those long battery cables are going to weigh a few pounds…

Looking awesome, love the cad printed parts.

That thing is badass. Hope it works out for you. I’m building a sidewinder set up for my kit if it ever arrives. Gear box is on . Turbo set up plumbed and it’s on the mount. Just need an airframe to hang it on.

Good morning 🙏 Ben, I'm perry from Washington state USA thanks for your share and I subscribed your channel already, i like airplanes and flying high and have a wonderful new year 2023.🥰👍👍🙏🙏

Those engines sound so sweet !

I was a Yamaha dealer for 26 years and will say the Apex power plant is a beast. When we added a turbo it was crazy.

Really stepped it up this time! Nice work

Hope all is well with you and the family. Look forward to an update on the build, the flying, and the business - would really like to hear how it's going for you. All the best!

12:46 sounds about like the snowmobiles. Still can't believe these engines are going in planes. Guess that is a testament to the reliability

More great work from a real craftsman

Great work! Going to be awesome!

I think you're doin' a fab job Ben.

Looking good

Can't wait to see it flying

Heck yeah!!! Awesome work!!!!

Lookin cool man!

Ben,You have done a very good Job,...! Thanks for these Ideas,...! Greetings from Bavaria...Curt

Hells ya! Nice job.

Awesome!!!

G, day from Sydney Australia. Yeh- wow... I'm amazed with your technology such as 3D printing parts. Over and above the CG assessment and weight distribution. Making "in roads" that's for sure! The air cooled Yamaha, very compact firewall forward. Not much room for a wrench and hands. I wonder what is the benefit in short engine mounts. I want to "get in and takeoff the mags and drop the oil etc 🌏🛩️

Dangggg....I might need your help starting mine soon.

Nice.

👍

Consider a servo bypass ahead of your muffler to a short straight pipe, when you want/need a few extra ponies. I might do that when I build mine just for T/O. Looking good though. How much for the 2 used titanium header sets?

I enjoy your videos! I think you are talented with maching and 3D cad printing. It is my opinion that you may want to consider your battery placement. Consider your voltage losses, and possibility of RF interference on such a long runs. Placing a larger battery with more cold cranking amps behind the traditional baggage area may have the same effect on CG as the more distant location. I know this will be more total weight. You still may need to run >6 ga wires. I would bond the plane near the battery, but still run a negative battery return wire to a common distribution point on the fire wall. Starting engines in winter uses a lot of power. (Warning this advice may be worth less than you paid for it. I know some about electronics and RF interference, but nothing about aviation)

then at 13:32 you superimpose your design over the engine. love this ..briefly how did you do this and what software products do you prefer.

I wanna put EFI on the rotax503, has anyone tried it? The bike 250 throttle bodies are pull push twist grips. microsquirt looks like it'll work it.

looks awesome! nice work. Defiantly take alook at E - Props for your prop. you'll save a few pounds going that route though. I haven't tried them yet so I can't speak for the performance.

Nice video. Wonder if you wouldn't be better off with a lithium battery at the firewall, and add lead at the tail for CG adjustment. Long battery cable runs loose power unless they are big is one reason I'm thinking and some of their weight is ahead of the CG. Also, the further back the lead weight is, the less of it you need. The last 3 Kitfoxes I've done, I widened the fuselages at the doors, not much extra weight, and way more room when you have the other guy with you. My Kitfox 4 with 912 and grove gear came in at 645, so if you can stay below 650, that will be real good. Just a few thoughts, like the videos. Jim

How much more does the apex weigh than the phaser engine?

Hi... i came upon your content and I have so many questions. im close to buying a kitfox kit. you are doing one thing that i have to master. you are using a graphics package to image items, three d print them, and then actually built the part for the plane. i subscribed to your content. more questions later. thanks

Did you built in some offset to counter the engines torque?

Hallo, i am based in South Africa. Where did u buy the gearbox and what is the price? Saw your video and what horsepower does this engine deliver?

Way to go! What's the app you're using to overlay the CAD assemblies on the photos of the aircraft?

hi..all i need is a basic point in the right direction. at 2:31 you superimpose the engine mount and then transfer the image to a rendering/design software package. could u please briefly tell me what you used and the name of the graphics modeler to create the design. thank you.

Could you tell me the physical size of your radiator and how many coes it has? I am putting a 3 cyl. 973 onto and x-air, (yeah, most people don't know what and x-air is) and I am trying to get an idea of coolining needs. Nice work on all of it. I like the 3d printed stuff.

Where you located. I’m in Boise

What thickness titanium did you go with for your firewall? Also have you considered selling your 3d printed parts files on your website? If you don’t already, I’m sure you’d get a decent amount of interest from people purchasing your file downloads….me being one lol.

Why are these ideal again? A quick google didn’t remind me. ThAaaaaanks

hello Ben ! I want to buy your engine, do you sell it? I live in Vietnam

Do you have a carbon fibre intake for sale now for an Apex?

aluminium door joggles

How will you unclip the battery when there is fabric on the sides? Maybe there is more clearance then it looks on the video.

What are you doing for a heat exchanger for cabin heat ?

Hi Ben, wandering what you've done and even more I would like to know how did you manage to use the engine speedometer for your airspeed? Regards Mihail