The key here is the attitude of the aircraft. With the plane level, yes, 9" is 9" regardless of the size or shape of the airframe. But I think the previous writer was talking about how that clearance is affected by the attitude of the aircraft. He also seems to be thinking the clearance is measured with the tailwheel on the ground - which I don't think is the correct way to measure prop clearance, even though most of the time the plane is on the ground the tailwheel is also on the ground.
When I was learning to fly in a taildragger it used to always worry me that the prop might hit the ground if I pushed the stick forward too much during the takeoff roll. One day during the pre-flight inspection the instructor picked up the tail and showed me how high it would have to be before the prop would hit the ground. I never worried about it after that. Cheers, Tony On 7 January 2014 02:01, Larry&Sallie Flesner <flesner at frontier.com> wrote: > At 08:59 AM 1/6/2014, you wrote: > >> 9" on a Citabria or Cub is not the same as 9" on a KR or other smaller >> plane. When you have a larger plane with the prop many feet in front >> of the gear you don't need to get the tail up to a very high angle >> before that 9" turns into zero as you do with a shorter plane with the >> prop not as far in front of the gear. >> > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > I would agree that there are a number of homebuilts that don't have the > recommended prop clearance. I would , however, respectfully disagree with > the above statement. > > 9 inches is 9 inches in any type of airplane, nose wheel or tail dragger, > on the ground in a level attitude. The SINGLE variable in prop clearance > is the length of the landing gear, not the length of the airframe. Marty > Roberts had an 0-200 swinging a 60" prop on a plans built KR2 with the 24" > Diehl gear legs and had maybe 4 inches of prop clearance if he was lucky. > My KR, same setup, prop size, etc., is stretched 24 inches and I have 9+ > inches of clearance. The difference is that I'm using 30 inch gear legs > (cut to 29 inches during fitting). > > The Corsair swung a GIANT size prop. Problem was they couldn't make the > gear long enough for ground clearance and remain strong enough to support > the aircraft in landing. Their solution, raise the fuselage by angling the > wing down to the gear which enabled them to use a shorter gear length. > > So, regardless of the length of your airframe, build your gear to give you > the prop clearance you want, whatever that happens to be. > > Larry Flesner > > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
