912 uls vs Viking HF110

[SkyPirate]

you got me ha ha my anaology might have been a bit "unthought" ,..we are also talking 3g loads,..with the 912 going straight up it's only 1 to 1.5 g unless you mount jatos's to the struts

[Slyfox]

you only have a small window and poof, the momentum is done, time to push the stick forward.

[SkyPirate]

na ,..left rudder pull back a little more on the stick and a little left aeleron ,.yeehaaa~!!!

[szicree]

it's 5500 to 6500 rpm coming into a R-100' corner at 90 miles an hour then subject it to 2.5 to 3G side load,..or end load in this case ,..(the motor is mounted in the car sideways) for 5 to 10 seconds at a time depending on the length of the corner

Wow! Are you saying that your car can hold 3g lateral for 10 seconds? What sort of car/tires are we talking about here?

[SkyPirate]

sure it can ,..heck a volkswagen can as long as the road isnt flat ,..and the tires are top of the line perelli's,..16 R 50's

probably aught to get back on topic

[whitewulfe]

Wow! Are you saying that your car can hold 3g lateral for 10 seconds? What sort of car/tires are we talking about here?

I'm going to venture a guess at either DOT racing radials, or full fledged slicks, since given the description (and my limited knowledge of racing) we're looking at either solo1 autocross/autoslalom, or proper circuit time trials/racing.

I sure know my old Fuzion ZRi tires supposedly could hand such loads (with a competent driver), but I know I could barely hold 45mph or so through anything remotely tight, but such was mainly due to lack of preparation (of both driver and car). The worst I'd ever done was a 270 degree turn at about 70kph in rallycross (and she was a tight corner too), and even then I knew I was pushing my own limits (but it was worth it, shaved something like 40 seconds off my very first time of the day - I drove conservatively at first since it was only my second event ever)

[Av8r3400]

The Rotax, actually evolved from a snowmobile right? And a 2 stroke one at that... the Fit, IMHO, has a superior pedigree... tinkering for 5 years will work the prop swing bugs out.

The 900 series Rotax engine (the one we are comparing to) is a dedicated aircraft engine. It did not evolve from a snowmobile engine, it was a clean sheet design solely for the aircraft market. It is not a conversion of any sort.

Its architecture has more in common with modern motorcycle engines.

[SkyPirate]

I raced rally up the access roads for ski areas and raced circle track asphalt ,..sure wish that hoosier still made the street legal rally tire ,.they were the best,..I don't like the good years they bust loose in a hurry once they reach 215 f degrees,..

ok before we get in trouble aught to get back on topic

[Slyfox]

na ,..left rudder pull back a little more on the stick and a little left aeleron ,.yeehaaa~!!!

I don't do that

[SkyPirate]

I like the rotax ,..heck 6 of my planes have had rotax on them of one size or another ,..just the cost of the 900 series and what I've seen happen to some after relatively low hours logged ,.. and TBO cost ,..this motor I'm using ,.cost is less then 1/20 the cost of a rotax 912 uls and I can get one local in a hurry if I need a replacement,..
As for the viking,..I don't know squat about it so I can not reply on it's pro's or con's,.but more power to the application if it works,..

Chase