Thanks: 
Likes: Wings look pretty long too from that other video
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Wings look pretty long too from that other video
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DENNY liked this post
The 2nd video makes this plane look a lot more interesting. Only question now is… How heavy duty is the empennage?
Looks like Vans might have a winner here.
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If that’s a trimming horizontal it trims at the trailing edge. That’s highly unlikely.
I was trying to figure that out myself.Originally Posted by stewartb
The triangular fuselage cutout that allows movement of the stab can be seen in the photo. It's hard to make out the exact geometry but I'd guess it's a stabilator similar to the PA-28.
If I had to guess the suspension is probably very similar to a
Stinson with a pivot point and internal struts.
I'm a big fan of 4130 chrome moly myself...., at least for something I'd be bashing around in rocks, but those flaps look huge, the gear is interesting, and the wing span is generous. At first glance it would seem to maybe outSTOL the 21? Besides the engineering involved, there is the marketing, always. Now if VANS came out with a CM fuselage bird, that'd be of a lot more interest to me. Oh yeah, tandem seating also.
Looks like a stabilator to me, but curious why trimming at the TE is highly unlikely?
Never seen a stabilator on a taildragger. My first thought is that’ll be a slow performance killer. I’d also watch for durability issues after operating on rough terrain. Whether it fails before that main gear suspension will be a crap shoot.
I’ve never seen a jack screw adjust the trailing edge and can’t imagine how elevator controls would compensate. But my life has revolved around Skywagons and Cubs. Familiarity plays a role.
The helio has a huge stabilator and it seems to hold up just fine. I agree at first glance a stabilator seems less robust but I’m not sure it’s any worse than a trimming stabilizer. Otter and bush hawk stabilizers trim at the TE...
Stabilator is a fine way to do an elevator control. Like was mentioned, the Helio has a stabilator and that contributes to their ability to still have good pitch authority even at high angles of attack. If done right it's no less reliable than a traditional elevator.
I see a bunch of interesting concepts grouped together on this plane. As for the stabilizer, that could just be for access to change the stabilizer position on the prototype while they figure out what works best. No doubt the huge flaps throw a monkey wrench into the trim. Don't think I'll sell my SC clone to order a kit just yet, but it looks like it would be interesting to play with for a bit.I expect they will have something at Oshkosh, so somebody that's there to see it can expound on what they see.
-Cub Builder
Helio stabilator is up limited so it cannot stall. Once slats are out and full flaps it will just sink, in full control, wings level with the interceptors when needed, unless nose lowered.
John
More details here.
https://www.kitplanes.com/rv-15-how-...ompare-tundra/
and
https://www.kitplanes.com/vans-rv-15-on-top/
Appears to be a solid two place and lots of gear or something like a 2+2 with GW to be around 2200lbs. Kit Planes is comparing it to a 170. Will initially use the IO-390, but will have future options for a PV IO-360. Will be interesting to see more performance numbers.
Does anyone know what the cables that run on the outside from the strut, up the door front then along the A pillar are for?
I suspect they activate the door jettison. Note the test pilot is wearing a 'chute.
Probably pulled by the white handles (PVC pipe on cable?) that can be seen in the interior shots.
Yup, that makes sense.
Better view of the front hinge release from a new Vans video:
The guys from Vans say it's going to be a 2 seater with a 4 place projected later on down the line if this is successful. The model shown at Oshokosh was very much an unfinished prototype and it's likely the wing and many other aspects of the design will be changed before it's released. It didn't even have fuel tanks installed; they had a fuel cell next to the front seat for flight testing.
That being said i's a great design and very good looking. They mentioned they might shorten the wing but hopefully they keep the long flaps and keep some performance in it. Projected cruise speed 140kts.
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I hope the speed demons at vans don't lose sight of what a bush plane is used for and accidentally make it too fast for real stol work.
And here I was already thinking about making the wings longer.
NX1PA
Anything less than 36’ just doesn’t look right
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Did anyone else notice the gurney flap on trailing edge of stabilizer?
MTV
That's a double gurney flap and would that be considered a bandaid? I guess you could design it in but all the helo examples I know of it was an after thought to correct a problem.
Float attach points? I hope they are not overlooking that.
Kurt
on the Piper Comanche, it was called an ANTI SERVO tab---to prevent over controlling---worked very well---quite familiar with PA-24---Did anyone else notice the gurney flap on trailing edge of stabilizer?
MTV
Sometime later at Oshkosh they added a note that the Gurney flaps were for testing only, to be able to tune control forces.
Did anyone else notice the gurney flap on trailing edge of stabilizer?
MTV
I was the one that put the note on the stab. This is an engineering prototype. We had a choice of going quick or leaving the plane at home. In order to go quick, we can change the length or hight of the tab. That takes hours. Or we can build a new stab which will take days. After flying the airplane, i provided the feedback that the stick force per G was too light. So we are tuning the feedback/forces. When we get the plane home, we will build a new stab with the hing 1/8 of an inch from where it is now and the forces will be what they are now.
the final kit will not have those on. Hope that helps.
AX-O. Thank you for joining in and sharing that info
Bill
Very Blessed.
One of my favorite details. If you can't read it, this is a comparison to the Cessna baggage door.
Now where did I put the keys?
In a testament to the "go fast" past design history of VANS, I see no provision for being able to open a window in flight! If you can't hang an elbow out in the breeze while cruising, what good is it?! Taking a door off isn't the same. And....said elbow/arm can't be resting on just a plexi or lexan edge, there needs to be something comfortable for an armrest. I'm no engineer, but I figured out how to put a flip up window in my RANS, (even though I can fly it with doors open, one or both, it's too much of a good thing, a window is just right) with a T-Craft spar scrap for the arm rest. Much thought was given to the height of the arm rest, followed by making a prototype, than a final production run, of one, was made, and it's frigging perfect, and much appreciated in these 95 degree days lately. I'm surprised none of you SC guys caught this glaring error, hopefully to be corrected in the final version. OTHER THAN THAT, it looks like a pretty cool plane.
Remember, this is the prototype. AND the door is rigged to jettison in case of a need to bail out. During flight testing Stuff sometimes happens. They may be a need to get rid of the door quickly. Let's hope not, yet being prepared is important. An opening window at this point is just fluff.
NX1PA
Agreed, just a prototype so fluffless. Just throwing that out there because of their .history, I'd bet its not even on their radar, not the way they think Don't see many RV 10's cruising around with an elbow sticking out.. Probably the same with most of their tire kickers, but if they want to address a certain market, the final product should hopefully have a opening window.
Last edited by courierguy; 07-31-2022 at 06:15 PM.
"If you can't hang an elbow out in the breeze while cruising, what good is it?!"
If you want to be really cool, you would also have a pack of cigarettes rolled up in the sleeve of your tee shirt.
i like the windows where you can see the front of the tires.
For those who saw it up close, is it powered by an IO-390 as had been speculated?
While I didn't see it in person, I watched the recorded Van's presentation on it, and it is using the Lycoming IO-390-EXP119 engine they use in the RV14.
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