What is the “highest” HP someone has put into a Kitfox?

[Rik]

At 17,999' I'm sure he has a turbo as there's not much air up there to run an engine. 140 gs is good but as you noted tailwind. At those elevations it's not uncommon to see 50 knot tailwinds.

It's hard to get one plane fulfill multiple missions I see.

Just wondering if there were any S7's with the same Lycoming that the Carbon Cubs are using that are tweaked to 200 hp

[jiott]

There is an Avid Magnum in my area that has 180 hp Lyc I believe.

[Dorsal]

Not sure where you are getting the 90-100 mph figure from, mine is a pretty standard 7 with 100 ponies and does 120 fairly comfortably.

[DesertFox4]

Lots of misconceptions circulating yet about cruise speeds and adverse yaw.
I ran into those questions at the Kitfox booth at Oshkosh yet this year.

Most attributable to the Models 1,2 & 3’s. Of course the adverse yaw issue was solved with the model 4’s and newer model’s redesigned control mixer along with larger tail control surfaces.

The speed questions likely relate back to earlier models and some early model 4’s equipped with 2 stroke engines. If you are not cruising at 105 to 110 mph or better in a model 4 with a Rotax 80 hp and up, something is amiss.

[Rik]

Thanks, I was thinking of building/acquiring a S7 STi and they don't seem that fast with the big tires and I don't know how much of this is the tires and how much of this is the wing.

Just watching YT Video's such as Trent's and others with a 100 hp (minimum) engine and they are cruising in the 90-100 range and odds are more often closer to the 90 than the 100.

I do not care about meeting the LSA requirements if this matters. I see a lot of comments on this site in reference to the LSA rules but I don't have a sport pilots license so I don't really care. I'm out for fun not a loop hole to allow it.

I'm still in the planning stage and I don't even know if a KF is the best option for me. I want a STOL plane and I have a distaste for a tandem setup so side by side options tend to be between the KF and the JUST.

[Slyfox]

you got to understand, those guys don't give a care about what their top speed is. they want off fast. climb out is their game. basically. I do believe the sti wing is a low stall not so fast wing. that's what I heard anyway. you need to figure out your mission. the standard super sport in my opinion would cover 90% of what a person in reality would want and need. I know trent is getting everybody a hard on for the STOL flying that he and his friends are doing. You just need to figure out if it's what you want. like I said the standard super sport is a great airplane on it's own. best thing it will go 120 with the 912uls. still land short and have a ton of fun.

[Rik]

This is kinda why I am asking. The 120 to get there and then the fun once you can get to a place to have fun. Not exactly a plane to travel 350 miles with but 100'sh seems ok and then the HP concern was that I could use that to get the plane to climb to compensate for the faster wing, ad VG's and such and be a decent compromise.

I have a crazy engine plan but who knows