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  #21  
Old 08-08-2021, 07:56 PM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
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Default

Quote:
Originally Posted by FlyNSoCal View Post
Since the RV-15 will be flown to remote locations which lack fuel, it would be nice if there was ample fuel capacity for the round trip. They say long range tanks are the best speed mod if you can avoid a landing to refuel.

I don't know if Cessna ever solved the uneven fuel feed between left and right tanks while in the "Both" fuel selector position. That would be awesome if Vans could pull that off.
I find the uneven fuel burn in Cessna’s can be attributed to pilot technique. If you have rudder trim, try moving it to the side that has more gas. Think “Step on the fuel”. The wings should be dead level in cruise, and almost imperceptible changes in rudder trim changes where fuel is burned from. This is also assuming both caps are vented in addition to the left wing vent.
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  #22  
Old 08-08-2021, 09:26 PM
FlyNSoCal FlyNSoCal is offline
 
Join Date: Jul 2021
Location: Southern California
Posts: 15
Default Rotax Engine

Quote:
Originally Posted by hpmicrowave View Post
After asking a few questions and listening to some interesting conversations at Oshkosh I got the clear feeling that Rotax is going to get a major new
customer for its 915iS engine around the first of 2022!
Interesting bit of information you got from Rotax.

It’s hard to say if Vans would entertain a Rotax. They did it with the RV-12, and I don’t think there are any regrets. The Rotax shows promise in some high-altitude strips where it would outperform many four-cylinder Lycomings. However, the Rotax will likely underperform higher horsepower, 6 cylinder Lycomings, even the naturally aspirated ones.

During the reveal, Vans framed their question as tandem vs. side-by-side. If those are the two options, that leads me to believe the RV-15 is a two-seater. If they are going with a two-seater, the airframe could be light enough to make the Rotax a very good choice. Now if they are looking at 4 seater, and they want short take off, there is a chance they’ll go with the larger Lycomings like you see on the Bearhawk.
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  #23  
Old 08-09-2021, 06:04 AM
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hpmicrowave hpmicrowave is offline
 
Join Date: Nov 2007
Location: Fort Walton Beach, FL
Posts: 113
Default RV15 Engine

I can only add that this rumour or best guess didn't come from Rotax but I think from a Rotax dealer.

Quote:
Originally Posted by hpmicrowave View Post
After asking a few questions and listening to some interesting conversations at Oshkosh I got the clear feeling that Rotax is going to get a major new
customer for its 915iS engine around the first of 2022!

This 915iS engine is not cheap but has phenomenal performance. So we'll see how the RV15 comes together.
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  #24  
Old 08-09-2021, 06:09 PM
gasman gasman is offline
 
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Location: Sonoma County
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Another approach to slow flight control.... https://vansairforce.net/community/s...9&postcount=93
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  #25  
Old 08-10-2021, 07:29 AM
F1R F1R is online now
 
Join Date: Nov 2010
Location: ____
Posts: 888
Default RV 15 Dreaming

https://youtu.be/kf5mhRPIkws

Allison / RR for high altitude picnic escapes.

Last edited by F1R : 08-10-2021 at 07:40 AM.
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  #26  
Old 08-10-2021, 10:39 PM
sarahfly13 sarahfly13 is offline
 
Join Date: Jun 2005
Location: Southern California
Posts: 10
Default Wish list and challenge.

I've built a few RV's, and I'd love to see the following:

RV-awesomeness + Cessna Cardinal + Kitfox

4 seats, 1300-1400lb empty, 2400-2500lbs gross weight, design around 210 hp IO-390, with option for IO-360 or IO-540. Cruise 150-180mph, stall at 45-55mph. Lots of room and easy entry/exit. Easy build and maintenance. Goal would be simple VFR for <$120K, fancy high speed backcountry IFR for $160k. Modern sheet metal design. As little composite and acrylic work as possible. Pre-made FWF and wiring harnesses. Maybe some builder assist centers to get it done in less than the usual 5 years.

If our favorite kit manufacturer doesn't want to go there.... Let me know, and I'd love to make these for folks that love building and flying as much as I do... Here's a rough idea of my perfect plane. See attached for a few renderings. Hopefully this works.

Sarah

https://dm2301files.storage.live.com...&cropmode=none

https://dm2301files.storage.live.com...&cropmode=none

https://dm2301files.storage.live.com...302&height=611

https://dm2301files.storage.live.com...&cropmode=none

https://dm2301files.storage.live.com...&cropmode=none

Last edited by sarahfly13 : 08-10-2021 at 11:09 PM.
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  #27  
Old 08-10-2021, 10:46 PM
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emsvitil emsvitil is offline
 
Join Date: Oct 2019
Location: SoCal
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sarahfly13,

Want's me to sign in to see your pictures............
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  #28  
Old 08-11-2021, 06:08 AM
FlyNSoCal FlyNSoCal is offline
 
Join Date: Jul 2021
Location: Southern California
Posts: 15
Default Cruise Speed

Quote:
Originally Posted by sarahfly13 View Post
I've built a few RV's, and I'd love to see the following:

Cruise 150-180mph...
Bump up the cruise speed by 10 to 15 mph and I would agree with you. There seems to be two camps of people on these RV-15 posts: one wants to shift the RV speeds lower to meet their STOL desires, and the other group wants to preserve the RV speed range in a high wing version. I guess it all depends on what Vans considers "backcountry capable".

Your images are pretty interesting. I see the spar carry-through has a reduced profile to accommodate passenger head room. I wonder if the spar could be moved aft a couple inches to give the front occupants even more headroom. I believe the Cardinal spar is placed a little aft as well. I like those doors. Reminds me of the Rans S-21.
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  #29  
Old 08-12-2021, 01:44 PM
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FresnoR FresnoR is offline
 
Join Date: Oct 2008
Location: Fresno, CA
Posts: 482
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I wonder if, and stay with me here, Vans could offer modular options. For Instance, a Standard Fuselage and wing hard-point, but options that can be added/removed/replaced:

Rugged Version: Heavy-duty struts (tri or dragger), balloon tires, leading-edge slats, cargo pod, STOL wingtips, etc.

Speed Version: Slim landing gear, fairings, cowling, shortened tips, etc.

The idea being you can mix or match these options to create the backcountry monster or speedster you want.


Is it possible to aerodynamically design a wing that can do both, with the addition of slats?
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Last edited by FresnoR : 08-12-2021 at 02:54 PM.
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  #30  
Old 08-12-2021, 01:59 PM
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Ironflight Ironflight is offline
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Join Date: Jan 2005
Location: Dayton, NV
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Quote:
Originally Posted by FresnoR View Post
I wonder if, and stay with me here, Vans could offer modular options. For Instance, a Standard Fuselage and wing hard-point, but options that can be added/removed/replaced:

Rugged Version: Heavy-duty struts (tri or dragger), balloon tires, leading-edge slats, cargo pod, etc.

Speed Version: Slim landing gear, fairings, cowling, etc.

The idea being you can mix or match these options to create the backcountry monster or speedster you want.


Is it possible to aerodynamically design a wing that can do both, with the addition of slats?
Certainly no reason that can’t be done. I was just finishing up an article on the latest American Legend Cub, and if you go through their order form, you start with a simple, basic Super Cub and start adding options until you want to stop - or if you don’t stop, you end up with the “Mother of All Cubs” (They actually call it that - the MOAC) that has every high lift, super shock absorbing, giant tired option you can think of.

Except cup holders….I didn’t see cup holders on the list…..
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Last edited by Ironflight : 08-12-2021 at 04:28 PM.
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