KR> Tailwheel questions
Thanks to everyone who responded with some great ideas. Now all I have to do is decide which way to go next!! Ron
KR> engine parts rust removal
http://www.hainesengineering.com/rhaines/corvair.htm#electrolytic
KR> engine parts rust removal
Recently someone posted an electronic way to remove rust from parts. I've tried to search the archives but nothing pops up when searching for rust removal?? Anyone remember who posted the message or the subject line. Thanks, Ron
KR> 12vdc Actuator Force
Mark Jones wrote: Mark, My guess is that you're thinking of getting the actuator at the Surplus Center at http://www.surpluscenter.com/ . If not, visit there and key in "linear actuator" for a lot of inexpensive options. I just got back from a great weekend with Richard Moleand even got a little stick time in... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> Tailwheel questions
Ron Wright wrote: > 1. Do any of you with tailwheels have any adjustment between the > tailwheel and rudder? Turnbuckle etc.? This is to align the tailwheel > and rudder. Yep. Basically I spliced my tailwheel cables onto my rudder cables, and shortly after the splice introduced two turnbuckles to do exactly that. They are spliced with a nicopress fitting, which works fine fore changing the relationship between rudder and tailwheel, as well as allows controlling the tension in teh tail wheel cables. > 2. Do any of you use springs between the rudder cable and tailwheel? If > so, about how strong are the springs you are using? I followed Troy Petteway's lead and have no springs on the tailwheel. It saves weight, money, and external drag. I haven't seen a downside to it yet. We leave a little slop in the tailwheel cables to act as a buffer, but I recently added a small and lightweight bungee cord between left cable and right cable just to take the slap out of it. The tailwheel cables would rattle against the fuselage sometimes, and the bungee cord cured that. > 3. Any photos sent direct to me of your installation would be > appreciated. Send direct to: I'll have to look for those, or make some next time I'm home... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> She Takes Flight
congrats, Mark. That makes we want to build build build.. jg N611GB
KR> Lubricating Oil Expected Life
Just for informational purposes ! There are huge auto ferries that travel from Galveston TX to Bolivar Peninsula. When I am in Galveston I usually walk on to one of these ferries and ride across and back just to smell the salt air and see the ships etc. On one trip across a couple years back I was standing by the stairway which led down into the below deck engine room. I struck up a conversation with one of the full time engine mechanics who had topped the stairway to get some cool fresh air. My questions surrounded the diesel engines, the oil, how much oil they required, and how often it was changed. All of this because the engines are diesel and I drive a diesel pickup truck. My truck requires 15 quarts of oil, the ferries require many many gallons of oil. I asked this fellow how often they change the oil in those engines, his reply caught me off guard. He said very rarely, since I am supposed to change my oil every 5 to 7 thousand miles I inquired further. I asked, "so if you had to put it into road miles, how often" he said probably a little over a million road miles ! I said how do you do that without damaging the engines. He said they had super filters that the oil was continually pumped through that completely cleaned the oil before it was pumped back into the engine. I thought that was pretty neat. Ever since then, I thought, since oil is not cheap, neither are filters for my truck that I needed to figure out how to filter my oil better so I could extend my oil changes. I remember back at one time that Amsoil Company used to sell an external oil filtering system that had little paper filters that looked kinda like a coffee pot filter that filtered smaller particles than a regular oil filter. These little filters cost 5 cents at the time. I ran into a guy in the Atlanta Georgia area around 1993 that had put this system on his V6 Ford powered home-built. His was the first time I had ever heard of this particular system. He told me that he changed the filter every time he flew the plane and had never changed his oil to that point. He pulled out the dip stick to show me and the oil looked brand new. I have thought all along that I would at least change my oil filter more regularly to extend the oil changes but I find myself just changing the oil at the same time. This is something to seriously think about though if oil were to become scarce or over priced as we have seen in the past months. Larry H. > 3 months @ 212 degrees F (100 degrees C) > For every 10 degrees F (10 degrees C) oil temperature increases, the > lubricants expected life is halved This is great news! Now I don't have to change my oil but every 1080 hours! That's assuming my average oil temp is about 222F during the summer. I guess my point is this may not be exactly accurate without a few caveats like duty cycle and that sort of thing. But your point is well takenI'm just pokin' fun at the numbers... Mark Langford, Huntsville, AL mail: N56ML "at" hiwaay.net website: www.N56ML.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
KR> 12vdc Actuator Force
Mark Here are two sites for linear actuators: on www.firgelliauto.com click on linear actuators, then click on required strength or stroke needed. on www.customstreetdesigns.com type in "linear actuators" on the search for line, then scroll down to "LACT6. This the the one Ron Willett and I have purchased. I did a little research (called RV and their actuator supplier) and was able to determine what linear force was needed. My belly board is 9"x30" and will project down at almost 90 degrees at full extension. Hope this helps. Pete Klapp, building KR-2S N729PK, Canton, Ohio > From: flyk...@charter.net > To: kr...@mylist.net; corvaircr...@mylist.net > Date: Sun, 29 Mar 2009 08:02:05 -0500 > CC: > Subject: KR> 12vdc Actuator Force > > I need to replace the 12vdc actuator on my belly board. > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html _ Quick access to Windows Live and your favorite MSN content with Internet Explorer 8. http://ie8.msn.com/microsoft/internet-explorer-8/en-us/ie8.aspx?ocid=B037MSN55C0701A
KR> Vacuum Bag Composite?
I was laying up some BID on some foam for the VStab parts. I layed up the one side and then went back to the HStab. Several days later as I was waiting for some curing on the HStab I went back to the one sided glassed foam to lay up the other side. Because of the way I had stored it there was a significant curve in it. I layed up the BID on the other side and then I put some duct tape on some boards and then placed some heavy water bottles on the boards to let it cure flat. The next day when I took off the water bottles and boards I had a surface that was smooth as glass. So I was wondering if it would make sense to apply a similar technique elsewhere. I am about ready to apply the final layup of fiberglass on the HStab. Should I lay down some peel ply and then vacuum bag the whole thing? I went to a little local fly in and they had some composite planes and my son-in-law asked if my surface was going to be that smooth. I told him I thought so, but I didn't know how it would get that way. Is that smooth final surface achieved with primer and sanding alone? -Kurt 128 hours in AZ
KR> 12vdc Actuator Force
area=1.875 sq ft speed=110*5280/3600=161.3 ft/sec dyn press=.00238*.5*161.3*161.3=31 lb/sq ft Cd for finite plate is 1.45 (not 1 because of wake drag - see Horner text) So force on the board is Cd * dyn press * area = 84 lbs which you can estimate acts at the center of the board. You then need to figure in the geometry of the horn to see what mech. advantage you have. The stroke length doesn't help much because the moment arm will change with angle - it all depends how it is set up. What is the distance from the horn attachment to the hinge line normal to the actuator axis at full deflection? Guys let me know if I have slipped a decimal somewhere. I know there has to be a formula out there to figure this and I hope someone smarter than me can tell me the pounds of force I need to accomplish a smooth and full deployment to 80 degrees from fuselage bottom. Oh yea, The stroke is 7 inches.
KR> 12vdc Actuator Force
>Kevin Golden wrote: >Did your actuator quit? How many hours on it? If it did quit, then the >actuator isn't sized right for the application or maybe some other problem >occurred My actuator is the one used on the flaps of RV aircraft so I know it is correct for the application. It has 250 flight hours on it. It works intermittently and sometimes not at all. There is no problem with switches or wiring. When it fails, I can tap on the motor portion and she will usually start operating. The housing is sealed so it can not be serviced. Like I said, I have sources for alternates but just need to know force pounds needed. Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com
KR> 12vdc Actuator Force
Did your actuator quit? How many hours on it? If it did quit, then the actuator isn't sized right for the application or maybe some other problem occured? I would just go to an industrial supplier and get what you need. Take what you have with you and they should be able to at least match what you have, but you probably need something better. In the industrial environment, low time operation with failures will cause us to redesign or upgrade to something better.even if OEM on the equipment being used. We simply cannot afford the downtime that substandard/undersized components cause. Try Grainger, SMC electric supply, MSC industrial supply, or McMaster Carr. Kevin Golden Harrisonville, MO In a message dated 3/29/2009 8:02:34 A.M. Central Daylight Time, flyk...@charter.net writes: I need to replace the 12vdc actuator on my belly board. I could buy another from Van's Aircraft but I prefer not to spend the $320 they want for it. I found another source where I can buy them at 1/3rd the cost of Van's. What I need to know is the pounds force it takes to deploy my belly board. Here are the parameters: Board measures 9" x 30"x 1/8" 6061T6 Deployment speed max 110 MPH. I know there has to be a formula out there to figure this and I hope someone smarter than me can tell me the pounds of force I need to accomplish a smooth and full deployment to 80 degrees from fuselage bottom. Oh yea, The stroke is 7 inches. Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com ___ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html **Feeling the pinch at the grocery store? Make meals for Under $10. (http://food.aol.com/frugal-feasts?ncid=emlcntusfood0002)
KR> 12vdc Actuator Force
I need to replace the 12vdc actuator on my belly board. I could buy another from Van's Aircraft but I prefer not to spend the $320 they want for it. I found another source where I can buy them at 1/3rd the cost of Van's. What I need to know is the pounds force it takes to deploy my belly board. Here are the parameters: Board measures 9" x 30"x 1/8" 6061T6 Deployment speed max 110 MPH. I know there has to be a formula out there to figure this and I hope someone smarter than me can tell me the pounds of force I need to accomplish a smooth and full deployment to 80 degrees from fuselage bottom. Oh yea, The stroke is 7 inches. Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com
