On 10/7/2021 8:55 PM, Global Solutions wrote:
Can anyone shed some light on how far one can fly with a kr2S with 140
lbs pilot and full tanks and a 110 hp Corvair engine?
++++++++++++++++++++++++++++++++++++++++++++
usable fuel on board / fuel burn per hour X ground speed = distance,
Increase range by adding tankage. simple math. Keep additional tanks
as close to the CG envelope as possible, i.e., build wing tanks long and
narrow and close to the main spar. Being experimental the tankage is up
to the builder and almost everyone is different and often more than is
needed.
++++++++++++++++++++++++++++++++++++++++++++
Has anyone built solid wing spars instead of boxed hollow spars for their
KR?
=========
Yes. I did.
Weight increase 12 lbs
strength and flex increase close to 2x
++++++++++++++++++++++++++++++++++++++++++++++++++++++
Is that claim a "design calculation" or "test to destruction" test? Have the stress
points changed anywhere in the wing? Having watched a standard spar tested to destruction (video on the net)
I question the "2X flex". Additionally, why is anyone trying to increase the strength of a wing
that has been flight tested to at least 6G's on an airplane that was 760 pounds empty with a 200+ pound pilot
that accidentally fell out of an aerobatic maneuver? (Marty Roberts) The KR doesn't need to be any stronger
than Ken and Stu designed it 50 years ago. You're going to end up heavier than you want anyway. Don't add
unnecessary weight.
This answer is not meant to stop discussion but but sometimes we builders get
off in to the weeds unnecessarily. Any claims such as the above should be
supported with valid proof for safety reasons.
Larry Flesner
________________________________
-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/
