George Toth from Texas built one many years ago. Bob Sauer Sun City West, Az N811RJ Flying
On Sun, Dec 12, 2021 at 5:08 AM Craig Williams <cr...@kr2seafury.com> wrote: > I think there's a reason you only see one Vans model that's a 4-seater. > Not a big market and there are plenty of 4 seat options out there already. > IMO a 4 seater KR would be a waste of someones time unless you just like > building one off airplanes. > > > CRaig > N886MJ (N51CW) > N6423B > > > > > > On 12/12/2021 2:51 AM Samuel Spanovich <spanovich...@gmail.com> wrote: > > > > > > I’ve seen online that a small group of designers have started the > “KR-Super 2” design, however has anyone out there ever started a 4-seater > KR design? > > > > With the price of 4-seater airplanes these days being well into the > 6-figure regime, I would think a KR4 would be a very popular design for > those who just want an extra seat or two for the occasional passenger, or > just a little extra luggage space. > > > > Most KR2S’s have an empty weight of around 600-700 lbs (mine is 650) > with a Revmaster 2100 (65 HP), and a gross weight of approximately > 1000-1200 lbs (mine is 1150 lbs). This offers fairly decent performance; > not great, but not terrible either. > > > > If this “KR4” were to be powered by a 100 HP Continental O-200, in > theory, to achieve the same Power/Weight ratio as the Revmaster, you could > have a gross weight of approximately 1750 lbs. For a little factor of > safety, let’s assume a Gross Weight of 1650 lbs. > > > > Of course when talking about a bigger airplane, you would need a bigger > engine, a bigger structure, which means more weight. > > > > Base Empty Weight = 650 lbs > > Engine Increase (2100D to O-200) = +50 lbs > > Structural Increase (bigger airplane) = +250 lbs > > > > KR4 Empty Weight ~ 950 lbs > > Gross Weight = 1650 > > > > That leaves 700 lbs for fuel, passengers, and luggage. For a Continental > 0-200, you could plan on about 6 gallons per hour, and could use 22 gallons > for about 3 hours of endurance with a 30-45 minute reserve. This would > leave you with 568 lbs for passengers/luggage. This would be plenty for two > passengers and a lot of luggage, or three medium sized passengers and a > small amount of luggage, or three larger (190 lb passengers) with no > luggage. > > > > If you managed to get 100-110 knots with this setup you would have a > range of about 300-330 NM. > > > > So what do you guys this? For those that have experience building, what > limitations would there be with widening the structure, lengthening the > fuselage, and also increasing the wing surface area? Would it be a matter > of just building a stronger/thicker spar/wing, or is there more to this > than I am realizing? > > > > I should have prefaced this with I am not an aircraft designer. > > > > Very Respectfully. > > > > Sam Spanovich > > N6399U > > 74S, Anacortes WA > > > > > > Sent from my iPhone > > ________________________________ > > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > > -Change list delivery options at > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > > -Search recent KRnet Archives at > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > > -Search John Bouyea's decades of archive at > https://www.mail-archive.com/krnet@list.krnet.org/ > ________________________________ > -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html > -Change list delivery options at > https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board > -Search recent KRnet Archives at > https://list.krnet.org/empathy/list/krnet.list.krnet.org/ > -Search <https://list.krnet.org/empathy/list/krnet.list.krnet.org/-Search> > John Bouyea's decades of archive at > https://www.mail-archive.com/krnet@list.krnet.org/ ________________________________ -Please see LIST RULES and KRnet info at http://www.krnet.org/info.html -Change list delivery options at https://list.krnet.org/list/krnet.list.krnet.org/ Affinity List Info Board -Search recent KRnet Archives at https://list.krnet.org/empathy/list/krnet.list.krnet.org/ -Search John Bouyea's decades of archive at https://www.mail-archive.com/krnet@list.krnet.org/
