KR> KRElevator weights advise
Static balancing controls is always a safe addition to the plane, but is still an addition of weight. It's probably worth noting that the plans do not call for static balancing the elevator. I have flight tested the original design elevator to 225 mph IAS with no indication that it might flutter. I have the newer designed stab and elevator on my plane now and have flight tested it to 215 mph IAS and 225 TAS, also with no indication of a desire to flutter. Both tails have been flown well in excess of the designed VNE. As far as I know, there has never been an incident of flutter in the elevator of a KR with either tail design. I should probably note that I have pushrod controls from the stick to the elevator, so there is no slack in the elevator control. I was going to add counterbalances to my elevator when I built the new tail on my KR, but just couldn't bring myself to add more weight to the plane, so didn't. I'm not going to criticize anyone for adding a counterbalance to the elevator, but realize that it's there to make you feel good as flight testing has never shown a need for it on the KR. -Jeff Scott Los Alamos, NM > > At 09:34 AM 5/21/2014, you wrote: > >What is the objective, to center the elevator with no stick input? > >Larry Bell > > > The objective of balancing any control surface is to eliminate > flutter, not to "center" a control surface. > > Larry Flesner
KR> KRElevator weights advise
At 09:34 AM 5/21/2014, you wrote: >What is the objective, to center the elevator with no stick input? >Larry Bell The objective of balancing any control surface is to eliminate flutter, not to "center" a control surface. Larry Flesner
KR> KRElevator weights advise
Sid, What is the objective, to center the elevator with no stick input? Wouldn't springs do the job or would that make control too stiff? Larry Bell On Tue, May 20, 2014 at 10:27 AM, smwood via KRnet wrote: > I used 2.6 pounds on a 16 inch arm hinged on a bell crank 14 inches > forward of the elevator hinge. Connection between the elevator bell crank > and the balance counter weight bell crank is by a push rod and rod ends. > All linkage and counter weight are in the fuselage. This push rod is also > part of the elevator linkage to the stick. Elevator and aileron linkage is > all pushrods. > > Sid Wood > smwood at md.metrocast.net > Tri-gear KR-2 N6242 > Mechanicsville, MD, USA > > >> >> -- >> With the horns just foam will they be strong enough to support the >> weight? or should I just add the weight off the push rod like Mark did. How >> much weight are we talking about?? I'm using the new? tail.? >> >> I built the wider tail on N3151K and ?need ~ 4.5 pounds to statically >> balance my elevator without primer and paint. 2.5 pounds on each horn right >> now .Probably a little more when painted.. >> >> Joe Cruz >> cruzj12 at frontiernet.net >> KR1.5 ? ? N3151K >> KR2S ? builder...fiber glassing main wing >> On Monday, May 5, 2014 9:15 AM, "ppaulvsk at aol.com via KRnet" < >> krnet at list.krnet.org> wrote: >> >> >> >> I can't decide where to put my elevator counter weights. I'm adding three >> inche foam horns to the elevator and covering? the hole thing? with carbon >> fiber.? With the horns just foam will they be strong enough to support the >> weight? or should I just add the weight off the push rod like Mark did. How >> much weight are we talking about?? I'm using the new? tail.? >> >> Paul Visk >> Belleville Il >> 618-406-4705 >> >> >>> > > > ___ > 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 >
KR> KRElevator weights advise
4.5 lbs is a lot of weight to add to foam horns. Even with CF on the ends. Joe, what did you do to beef up the horn areas? Paul Visk Belleville Il 618 406 4705 Sent from my HTC on the Now Network from Sprint! - Reply message - From: "smwood via KRnet" List-Post: krnet@list.krnet.org Date: Tue, May 20, 2014 12:27 pm Subject: KR> KRElevator weights advise To: I used 2.6 pounds on a 16 inch arm hinged on a bell crank 14 inches forward of the elevator hinge. Connection between the elevator bell crank and the balance counter weight bell crank is by a push rod and rod ends. All linkage and counter weight are in the fuselage. This push rod is also part of the elevator linkage to the stick. Elevator and aileron linkage is all pushrods. Sid Wood smwood at md.metrocast.net Tri-gear KR-2 N6242 Mechanicsville, MD, USA > > > -- > With the horns just foam will they be strong enough to support the weight? > or should I just add the weight off the push rod like Mark did. How much > weight are we talking about?? I'm using the new? tail.? > > I built the wider tail on N3151K and ?need ~ 4.5 pounds to statically > balance my elevator without primer and paint. 2.5 pounds on each horn > right now .Probably a little more when painted.. > > Joe Cruz > cruzj12 at frontiernet.net > KR1.5 ? ? N3151K > KR2S ? builder...fiber glassing main wing > On Monday, May 5, 2014 9:15 AM, "ppaulvsk at aol.com via KRnet" > wrote: > > > > I can't decide where to put my elevator counter weights. I'm adding three > inche foam horns to the elevator and covering? the hole thing? with carbon > fiber.? With the horns just foam will they be strong enough to support the > weight? or should I just add the weight off the push rod like Mark did. > How much weight are we talking about?? I'm using the new? tail.? > > Paul Visk > Belleville Il > 618-406-4705 > >> ___ 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
