RV-9 with Rotax 915

Discussion in 'Home Builders and Sport Pilots' started by Adam Weiss, May 9, 2021.

  1. GeorgeC

    GeorgeC Administrator Management Council Member PoA Supporter

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    I'm no A&P, but it looks like the camshaft is on the bottom, and the crankshaft drives the reduction gearbox/overload clutch.
     
  2. Capt. Geoffrey Thorpe

    Capt. Geoffrey Thorpe Touchdown! Greaser! PoA Supporter

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    Ummm.... No.

    Separate gear box with something like a 2.47 reduction ratio and a couple clutches.
     
    Last edited: Aug 7, 2021
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  3. Warmi

    Warmi Line Up and Wait

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    https://www.rotax-owner.com/en/component/jomclassifieds/advert/99-prop-strike-inspection?Itemid=495

    Still not cheap after prop strike even with the slipper clutch … about $1000-1500 for a prop strike inspection but chances are that’s all you will need to shell out.
     
  4. Daleandee

    Daleandee En-Route

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    Seems to me Cessna would have done much better with the SkySnatcher (OK SkyCatcher) if they would have stayed with the Rotax 912S. As it turned out with the O-200D they had less than 500 lbs. of payload in an aircraft designed for the training market.

    Of course a lot of training is done in overloaded Cessna 150's but we don't wanna talk about that ...
     
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  5. GeorgeC

    GeorgeC Administrator Management Council Member PoA Supporter

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    I find it interesting that Vashon repeated that mistake with the Ranger.
     
  6. Juliet Hotel

    Juliet Hotel En-Route

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    They are not yet talking about what kind of power it will need nor how many seats.
     
  7. Andrew Morris

    Andrew Morris Pre-Flight

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    Don’t forget the owner of Vashon marketing that it has a “real aircraft engine in it.”

    I’m kind of a Rotax fanboy and am so grateful they’re making modern engines for aviation. The 915 is 145HP on a dyno at 45” and 5800 and the 916 is a 915 with an ECU remap putting out 165HP at 50” with 145HP max continuous vs 135HP of the 915. The 916 is coming soon.

    There are some insane aircraft out there utilizing the 915. Y’all ever seen numbers like this? 36 MPG at 215 MPH.
     

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  8. Adam Weiss

    Adam Weiss Pre-takeoff checklist

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    What plane is this?
    Impressive numbers.
     
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  9. Andrew Morris

    Andrew Morris Pre-Flight

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    Risen SuperVeloce. Here is the VL3 915.
     

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  10. Tfd42

    Tfd42 Filing Flight Plan

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    Screenshot_20220518-151002_Gallery.jpg Screenshot_20220518-151135_Dropbox.jpg
    I'm not saying this is a prototype 915 rv9 from a few years ago, but I'm not saying that it isn't either
     
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  11. Adam Weiss

    Adam Weiss Pre-takeoff checklist

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  12. DaleB

    DaleB Final Approach

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    That would be illegal…
     
  13. Adam Weiss

    Adam Weiss Pre-takeoff checklist

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    As soon as I posted, I knew there would be someone on PoA that couldn’t help themselves.
     
    Last edited: May 18, 2022
  14. NordicDave

    NordicDave Pattern Altitude

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    Adam, Across the Internet when pedantic class is in session, students are sent here for lab work.
     
    Last edited: May 18, 2022
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  15. schmookeeg

    schmookeeg En-Route

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    Yes, but when will vans come out with a 2-seat 150ish kt kit plane, possibly offered in both tailwheel and nosewheel versions?
     
  16. tsts4

    tsts4 Cleared for Takeoff

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    I’m guessing you’re being facetious since the RV-9/9A is that plane.
     
  17. schmookeeg

    schmookeeg En-Route

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    Yes.

    Also the 4, 6, 7, 8, 12, 14... :p

    I thought it funny that the thread started by highlighting Vans' refusal to try new things, and other than the RV10, to this innocent bystander, that may as well be their company motto and claim to fame.
     
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  18. tsts4

    tsts4 Cleared for Takeoff

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    ha you got that right—with roughly a third of all flying US E-ABs, Van’s is crying all the way to the bank.
     
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  19. wanttaja

    wanttaja En-Route

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    What's your source for that statistic?

    As far as Van being reluctant to sanction alternative engines, the data pretty much backs him up. About 5.6% of accidents happening to Lycoming O-320-powered homebuilts are due to mechanical issues with the engine, vs. 25% of Subaru-engine-powered homebuilts. Hondas come out roughly the same as the Subarus, except the sample size is pretty small.

    The Rotax 912, on the other hand, comes out pretty good. It actually has the lowest rate of mechanical failure of all the engines I looked at.

    Ron Wanttaja
     
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  20. tsts4

    tsts4 Cleared for Takeoff

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    Over 11,000 RVs have flown (according to Van’s who gets first flight reports direct from builders) — granted that’s world wide and not all are still flying, so I’m taking some liberty there. IIRC, there’s just over 30,000 E-AB US Registered aircraft, but I could be wrong. The percentage might be off, but no matter how you slice it RVs make up a sizable slice of the fleet, but I won’t quibble over the exact percentage,
     
    Last edited: May 19, 2022
  21. DaleB

    DaleB Final Approach

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    I should just stop trying to use any form of humor, especially the dry variety, anywhere. It rarely goes the way I'd planned. Imagine me saying those exact words, but the same way a friend said them when asked if he'd performed a particular maneuver in a particular airplane... details omitted to protect the "innocent until reported to the FAA".
     
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  22. TCABM

    TCABM En-Route

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    I’ll tell you right now I’m trying to decide between building the RV-10 and the Sling TSi. Where I get stumped is pros/cons of running a 260hp motor at reduced power settings vs running a 145hp motor at full power.

    I’m not worried about fuel flow, I’m wondering the practical impacts on reliability and simplicity/complexity.
     
  23. Salty

    Salty Touchdown! Greaser!

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    Biggest con of the 145hp motor is that no matter how far you push the throttle forward, you can't get 260hp from it.
     
  24. tsts4

    tsts4 Cleared for Takeoff

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    Most of everyone I know with a 10, myself included, run their 540s WOT with an average RPM of somewhere in the neighborhood of 2300 with no significant reliability issues. The 540 is really a pretty bullet proof motor. The Sling is a nice aircraft, but IMO it’s kinda like comparing a 172 to a 182, not exactly apples to apples.
     
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  25. TCABM

    TCABM En-Route

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    I was just perusing the other thread again and know how you feel re: orange/tangerine. Reality is it will take a lot to convince me the TSi is the way to go.
     
  26. Whitney

    Whitney Ejection Handle Pulled

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    Are Sling planes kit only?

    I thought they were available factory finished, or as a kit.
     
  27. tsts4

    tsts4 Cleared for Takeoff

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    iIRC at least some of their models can be purchased as flying aircraft straight from the factory, but their US marketing focus has been to the E-AB community.
     
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  28. DMD3.

    DMD3. Pre-takeoff checklist

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    To get a bit off topic,how do you think the 915 would do on an RV 3 or 4? According to previous posts, the 915 would need to be mounted farther forward. Essentially, the engine is a bit too light (915 is 185 lbs., 0-235 is 246 lbs.). Would it be too light on the 3 or 4? And even though the Rotax has less power than the standard 0-320’s at lower altitudes, the lighter weight would presumably compensate for that during takeoff & climb.
     
  29. German guy

    German guy Cleared for Takeoff

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    Another thing to consider is how long it takes to put them together. The Sling is MUCH faster to build.
     
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  30. Whitney

    Whitney Ejection Handle Pulled

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    Then if I were ever going to build one, Sling it would be.
     
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