Welcome Jacob,
Please see answers imbedded:
--- jacob coby <[email protected]> wrote:
> Hi all,
> I'm thinking of building a KR-2S, and while I wait
> for the info-pack to arrive, I have a couple of
> questions.
> - Is the KR-2S more stable/less twitchy in pitch?
> I've read that the KR-2 requires a light touch ("fly
> by thought").
The KR-2S has a "longer moment arm" between the
horizontal and wing mean aerodynamic centers which
equates to being less pitch sensitive.
I'd like something that I can trim for hands off
flying. Most builders have some sort of pitch trim.
>
> - How well does the tri-gear KR-2S handle grass
> strips? Most builders prefer hard surfaces,
however,
Mark Langford is building a tail-dragger for
occasional grass strip operations.
> - What kind of performance can I realistically
> expect from the KR-2S with a 75hp revmaster engine?
It depends on how much you end up weighing. Lee
Robbins has been fling one for over 20 years now on a
type 4. Jim Faughn has been flying for years now on
his 2180. and has verified (if memory serves) the Rand
Robinson KR-2 numbers, or very close.
> - I'm a bit scared of wood composite construction.
Howard Hughes wasn't, nor was Dehaviland's Mosquito
Bomber that was one of WWII's most rugged bombers.
KR's have been flying for 30 years.
> Is there really anything to be worried about? I'm
> thinking about glue life, fatigue, warping/internal
> stresses from moisture; things like that.
See Above, however, grain direction is very important
when building the airframe
> - The AS504x airfoil: how does it compare to the
> RAF-48 airfoil in the real world?
That's a Mark Langford question, check out his
website.
From what I
> understand, its an all around higher performance
> airfoil, while still maintaining the same sort of
> flight characteristics as the RAF48. Are there any
> downsides to this airfoil? From what I understand,
> NLF airfoils are very finicky to surface
> irregularities.
>
> - Is the seat:controls adjustable in any way?
Plans call for a sling seat.
>From what I'm seeing, the seat is glassed into place,
and you pick rudder and stick positioning based on
where you feel comfortable with.
I was formerly a Sr. Project Engineer for a Teir 1
automotive seating supplier, I was able to package a
95th % Oscar into the KR.
>
> - What is a real-world cost to build for the KR-2S?
Varies from builder to builder- it all depends on what
you want to put in it. There are plenty of projects
for sale, that will put you light years ahead of
starting from scratch.
> I have the engine and VFR instruments (minus
navradio) already. That just makes you closer to
finishing.
> - Is the KR-2S aerobatic-capable (with proper oil
> and fuel arrangements)? According to Rand Robinson,
Lazy eights etc. Very light aerobatics.
I've seen mention of the KR-2 handling +6 Gs.
All of this is dependant upon your final gross weight.
> - Is anyone in the Triad, NC (Winston-Salem,
> Greensboro, High-Point) area building one or have
> one that flys? I live in Belews Creek, and would
like to stop by and take a look.
Check-out: http://kr-builder.org/
I believe Dan Heath lives pretty close to you. Dan
And Jerry's Wannabe is still in the construction
phase, but is very similar to what you want to build.
>
> Thanks in advance,
> -Jacob
=====
Scott Cable
KR-2S # 735
Wright City, MO
[email protected]
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