Thanks Bob. It looks like the KR2 (given its light weight & compact design) is very sensitive on load and weight & balance ... Yes, I agree if the back pressure is quite dynamic wrt load/copilot weight etc, there is not much we can do except using innovative solutions, such as adding a spring or two on the elevator or ground adjustable trimtab... This would probably slash off your cruising speed for half a kt per hour giving the same rpm or fuel consumption rate, perhaps?
Kindly, Dr. Hsu On Mon, Mar 30, 2020, 9:02 AM <robert7...@aol.com> wrote: > Dr. F Hsu, > Steff, > > It actually sounds like Stef is doing fine on solving this issue of nose > heavy controls. Moving a battery is certainly not an easy solution. > > I have a ground adjustable but otherwise "fixed" trim tab on my elevator. I > set it up during Phase I testing to provide for hands off flight with just > myself abord. When I have a passenger, I use a bunge cord (same as his > spring concept) to push the nose further down to relieve the control > pressure needed for the heavier load. It works fairly well. > > Best option would be for a fully in-flight adjustable system, I see a lot > of > Ray Allen servo systems out there. But they do cost some money. Fixed trim > tab and springs is much cheaper. > > Thanks, > > Rob Schmitt > N1852Z > www.robert7721.com > Kansas City, MO > > > > > > -----Original Message----- > From: KRnet <krnet-boun...@list.krnet.org> On Behalf Of Dr. Feng Hsu via > KRnet > Sent: Monday, March 30, 2020 9:36 AM > To: KRnet <krnet@list.krnet.org> > Cc: Dr. Feng Hsu <fenghs...@gmail.com> > Subject: Re: KR> Yes I fly again. > > Hi Stef, > > I am new in this KR world and I take every opportunity to read and learn > from this family! However, I am just a bit curious about your solution for > the "nose down" issue? Why would you want to install a fixed trimtab, > instead of trying to resolve the problem through checking your "weight & > balance" status, and possibly make some easy changes, such as moving your > battery a few inches forward or backward...? > > Kindly and stay safe & healthy! > > Dr. F. Hsu > Albuquerque, NM > USA > > > On Mon, Mar 30, 2020, 6:49 AM Stef den Boer via KRnet < > krnet@list.krnet.org> > wrote: > > > Hi, > > > > Last few days the weather in the Netherlands was good so I took our > > baby in the air after a few months. I have to go alone because of the > > corona virus my dad needs to stay at home. I did 2 session about 1:10 uur > each. > > > > It was good to have the feelings again. I did Some training, 360`s, > > steep turns, accelerating to 150 kts and back to 70kts and again to > > higer speeds. I am feelings every hour more and more relax in the KR2. > > > > > > Oil cooling > > > > I did a modification to the oil cooling and the temp is now 108 degr c. > > (In cruise 130 Outside 4degr c) So I did won a few degre but for the > > summer I need to goo down a few more degree. I have one more idea to > > do. If this is not werking I need to go for the 2end oil cooler. > > > > > > Landings, > > > > The landings (4 times) feelings more relax, but due to my longer nose > > section I make everytime the same mistake to drop the nose when the > > Main gear touch down. I think I want to have a good view to the > > runway. I need more practice I think. > > > > > > Nose down from first flight. > > > > The plane wants to go nose down from the first flight so we installed > > a fixed trimtab on the elevator. Problem solved. I think we made the > > elevator a bit to heavy, so the weight of the ellevator is forcing the > > nose down.....I think. I designed a bracket (at my push pull bar for > > the > > elevator) that can picknick up a few Springs. The idea was that 2 > > spring will be oke to do the job. But after a test flight (I removed > > the fixed > > trimtab) the plane is going again a bit nose down at 80 kts. I need > > only a bit stick force to keep the plane straight, from 80 kts and > > higher the original trimtab is efficient enough. Next flight I will > > install an extra spring, I think the problem is than solved. > > > > > > I need to make an extra muffler because the plane is a bit to noisy. > > This will be the next to take care off. > > > > Let you know if I have new experiance. > > > > > > Stef > > > > > > > > > > > > Steph and his dad are building the KR-2S see > > http://www.masttotaalconcept.nl/kr2 > > http://www.masttotaalconcept.nl/kr2 > > _______________________________________________ > > 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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