Hello Anthony. I'm Don January and live 50 miles west of you on highway 2 in Michigan N.D. I Have a Taylor-monoplane nearing completion and is built very much like a KR-2. Now would be a good time to stop by and get a close look at the building involved from wings to control surfaces along with Fuselage. You can drop me an email at januaryd...@gmail.com or give me a call 701-259-2111 I have a very large pile of KR-2 info because my last plane was a KR-2 and I took many parts to put into my new plane from it. Don J
On Sun, Aug 9, 2020 at 2:39 PM Anthony Steinke via KRnet < krnet@list.krnet.org> wrote: > Since this thread no longer has nothing to do with my original post, the > title should probably be changed and a new thread on weight and balance > started. > > Anthony Steinke > > Get Outlook for Android<https://aka.ms/ghei36> > > ________________________________ > From: KRnet <krnet-boun...@list.krnet.org> on behalf of Dr. Feng Hsu via > KRnet <krnet@list.krnet.org> > Sent: Sunday, August 9, 2020 3:06:58 PM > To: KRnet <krnet@list.krnet.org> > Cc: Dr. Feng Hsu <fenghs...@gmail.com> > Subject: Re: KR> New Guy > > I would also say, that one of the biggest safety hazards for a very small > and light aircraft like the KR2, is its extremely high sensitivity of CG > locations, correct? Or in other words, it's the VERY LOW erro tolerance for > CG violations, which could change in a potentially very hazardous way when > taking a passenger with short or long legs, or someone with abnormal body > weight... Right? > > Kindly, > > Dr. Hsu > > On Sun, Aug 9, 2020, 2:53 PM Dr. Feng Hsu <fenghs...@gmail.com> wrote: > > > Absolutely Larry! Sorry I really meant to say, in my previous questions > > that we prefer a bit head heavier rather than tail heavier due to the > > control capabilities we could leverage on using the horizontal > stabilizer, > > correct? But not sure if anyone has tried this, say by how much (within 5 > > or 10 ponds at maximum?) weight that a KR2 could tolerate if the head > > section is heavier than the normal weight balances? > > > > So, it could be dangerous even if the tail section is around 2 pond > > heavier than CG required, correct?! > > > > Kindly, > > > > Dr. Hsu > > > > On Sun, Aug 9, 2020, 1:52 PM Flesner via KRnet <krnet@list.krnet.org> > > wrote: > > > >> On 8/9/2020 11:30 AM, Dr. Feng Hsu via KRnet wrote: > >> > >> > >> > >> > >> > >> > >> > >> > >> Also, I wish to know what's the design error tolerance on the CG > position > >> for KR (not KR2S)? Such tolerance is determined by the capacity (surface > >> area) of the stabilizer, correct? If there is any uncertainty about the > CG > >> spot, or to put the last two ponds of extra luggage during loading, we > >> would much prefer to allow the tail heavier than otherwise, true or > false? > >> > >> +++++++++++++++++++++++ > >> > >> FALSE. Tail heavy is the worst possible condition for control and there > >> is no tolerance. In the case of the KR2, pilots advise to stay out of > >> the last two inches of the C.G. range. The 2S is longer so it may > >> tolerate the rear 2 inches. > >> > >> Speaking of C.G. range, it is in the plans of which mine are at the > >> airport. I recall 8" to 16" referenced to a certain location but I > >> don't recall that location from memory. That range falls in the area of > >> 15 to 30% of MAC (Mean Aerodynamic Cord is 48" in this case as it is > >> measured on the center section). Someone please post the range given in > >> the manual. > >> > >> +++++++++++++++++++++++++++ > >> > >> > Of course we can calculate the CG point if given design information, > >> but I > >> > suspect that the ultimate verification of CG is to use 3 weight scales > >> (one > >> > on each wheel) to find out the weight balance (empty or gross) point > >> > perhaps. Am I correct? > >> > > >> > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >> > >> That is the only way to determine C.G. location. Place the aircraft on > >> scales, perfectly level, select a datum point (a reference point to > >> measure from) , multiply the weight at each wheel times the distance > >> from the datum (arm) to determine the "moment" in inch pounds. Add all > >> the "moments" and divide by the total weight of all scales and that > >> gives you the c.g. location in inches from the datum. There are many > >> sites on the net that give the procedure. C.G range is, in my opinion, > >> equal to structural integrity in importance for safe flight. Do it > >> right or get your affairs in order for your survivors. > >> > >> Larry Flesner > >> > >> > >> > >> _______________________________________________ > >> Search the KRnet Archives at > >> https://www.mail-archive.com/krnet@list.krnet.org/. > >> Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to > >> change options. > >> To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > >> > > > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org > _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. 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