KR> Center of Gravity and Prop Spinners
Geez Mark, Lighten up. When you said,? I find it interesting that you're building your own composite airplane, with composite spars which you apparently designed, and you're worried about the spinner...? I was a bit surprised at your ire. I was just being dramatic, tongue in cheek, when I said, ?do not trust myself fabricating a part that is required to spin thousands of times a minute.? Much that same as you when you said,? I'm also reluctant to give myself the opportunity to kill any teenagers other than my own.? I?m sure I could fab my own spinner, just wondering if there is a commercially available one that would be almost as good (No WAY it could be as cool as your spinner ;->). I?ve flown behind a prop I fabricated myself (using a CNC router at a friend?s company making production solid body guitars). It worked great and is still flying as far as I know. I do not recommend it, and I would not do it again. Hey, let?s get together at Oshkosh and chew the fat? I?d love to hear about this econo-plane you are designing. Take care, Scott
KR> Center of Gravity and Prop Spinners
Scott Watts wrote: > Are there any commercially available composite spinners that that > would work for a rear starter application? I have found a few for > commercial aircraft, but they are REALLY expensive. I can not get > excited about making my own spinner. Mark, if you were to do it over, > would you still fab your own spinner? Sure, I built it to fit my plane perfectly, it's perfectly balanced, I built it in about four hours and saved a lot of money and hassle, and I can brag that I built it myself! Isn't that the definition of homebuilding? I might have four hours of my time in the whole thing. Of course I'd do it again. If I wouldn't recommend doing it I probably wouldn't have gone to the trouble to show others how to do it by making a web page showing the details. > I'd like to get your same look, but do not trust myself fabricating a part > that is > required to spin thousands of times a minute. I find it interesting that you're building your own composite airplane, with composite spars which you apparently designed, and you're worried about the spinner... Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> Center of Gravity and Prop Spinners
>Are there any commercially available composite spinners that that >would work for a rear starter application? I use a UHS spinner on my rear starter set up. Of course it would work just as well on a front starter too. The UHS uses a front bulkhead and no back bulkhead plate. I really like mine. I have bought two. The deer strike broke my first one. Here is the link http://uhsspinners.com/ Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com
KR> Center of Gravity and Prop Spinners
Are there any commercially available composite spinners that that would work for a rear starter application? I have found a few for commercial aircraft, but they are REALLY expensive. I can not get excited about making my own spinner. Mark, if you were to do it over, would you still fab your own spinner? Scott > Also, I like your streamline spinner/cowl, but notice from your web > site that you essentially made your own custom spinner. I'd like to > get your same look, but do not trust myself fabricating a part that is > required to spin thousands of times a minute. Since the time you made > yours, have you found a commercially available spinner that might do > the trick? If you were to do it over again, what would you do? What > is the diameter of your spinner at the cowl? The part number and place to buy the spinner that I used for a mold is in the first sentence of my "how to build a fiberglass spinner" page at http://home.hiwaay.net/~langford/spinner/.
KR> Center of Gravity and Prop Spinners
Also much lighter and less susceptible to fatigue crack around the the cutouts. No ugly rivets and doublers needed. Check out Aircraft Spruce, they have some well priced ones if you worry about making one yourself. John Martindale 29 Jane Circuit Toormina NSW 2452 AUSTRALIA ph: 61 2 6658 4767 (H) mob: 0403 432179 email: johnja...@optusnet.com.au web:www.members.optusnet.com.au/johnjanet/Martindale.htm -Original Message- From: krnet-bounces+johnjanet=optusnet.com...@mylist.net [mailto:krnet-bounces+johnjanet=optusnet.com...@mylist.net] On Behalf Of Mark Langford Sent: Tuesday, 9 June 2009 5:15 AM To: KRnet Subject: Re: KR> Center of Gravity and Prop Spinners One more thing on fiberglass spinners...snip
KR> Center of Gravity and Prop Spinners
>I see you do not lock wire your prop bolts Mark. >Is that normal ? Some do and some don't. Normal? Is anything normal in experimental aviation? But to answer your question, no I don't and never have. I do use lock nuts though. Never have a problem yet. But some day I guess I could. The only thing on my engine that is lock wired is the flywheel bolts and the only reason they are is that they are so close to the firewall that I can not check the torque like I can on the rest of the engine. The FAA inspector saw no problems with my installation so I felt I was good to go. Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com
KR> Center of Gravity and Prop Spinners
There was earlier mention of needing to put or use a front bulkhead on a spinner. What is that ? Scott Mark Jones wrote: > > >One more thing on fiberglass spinners...I consider them to be safer than > >aluminum ones. If the spinner comes off on climb out, the prop is much > >less > >likely to suffer damage if it hits a composite spinner than if it hits an > >aluminum one. > > And here is a link to show you what happens when you lose an aluminum > spinner in flight. > http://www.flykr2s.com/lostspinner.html and I consider myself very lucky > once again as this one > caused minor damage. It did not hit the plane at all. Joe Weber was my > wingman when it came apart.
KR> Center of Gravity and Prop Spinners
Sorry GUYS I did not have my ( do not include senders massage) turned on when I sent the last post!! Phil Matheson SAAA Ch. 20 http://www.saaa20.org/ VH-PKR Australia EMAIL: phillipmathe...@bigpond.com KR Web Page: www.philskr2.50megs.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> Center of Gravity and Prop Spinners
I see you do not lock wire your prop bolts Mark. Is that normal ? Phil Matheson SAAA Ch. 20 http://www.saaa20.org/ VH-PKR Australia EMAIL: phillipmathe...@bigpond.com KR Web Page: www.philskr2.50megs.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 - Original Message - From: "Mark Jones" <flyk...@charter.net> To: "KRnet" <kr...@mylist.net> Sent: Tuesday, June 09, 2009 5:50 AM Subject: Re: KR> Center of Gravity and Prop Spinners >One more thing on fiberglass spinners...I consider them to be safer than >aluminum ones. If the spinner comes off on climb out, the prop is much >less >likely to suffer damage if it hits a composite spinner than if it hits an >aluminum one. And here is a link to show you what happens when you lose an aluminum spinner in flight. http://www.flykr2s.com/lostspinner.html and I consider myself very lucky once again as this one caused minor damage. It did not hit the plane at all. Joe Weber was my wingman when it came apart. I thought I had hit a bird but he knew better and watched the spinner fly over the top of my plane. 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
KR> Center of Gravity and Prop Spinners
>One more thing on fiberglass spinners...I consider them to be safer than >aluminum ones. If the spinner comes off on climb out, the prop is much >less >likely to suffer damage if it hits a composite spinner than if it hits an >aluminum one. And here is a link to show you what happens when you lose an aluminum spinner in flight. http://www.flykr2s.com/lostspinner.html and I consider myself very lucky once again as this one caused minor damage. It did not hit the plane at all. Joe Weber was my wingman when it came apart. I thought I had hit a bird but he knew better and watched the spinner fly over the top of my plane. Mark Jones (N886MJ) Stevens Point, WI E-mail: flyk...@charter.net Web: www.flykr2s.com
Fw: Re: KR> Center of Gravity and Prop Spinners
-- Forwarded Message -- From: "Mark Langford" <n5...@hiwaay.net> To: "KRnet" <kr...@mylist.net> Subject: Re: KR> Center of Gravity and Prop Spinners List-Post: krnet@list.krnet.org Date: Mon, 8 Jun 2009 14:05:08 -0500 Scott Watts wrote: > You reported an all up engine weight of about 250 lbs for the Corvair > in your KR. What moment did you use? Say from the firewall? I assume > this does not include the prop and spinner, cowl etc...??? >From the CorvAircraft archive: Mark L wrote: >I've always said 240 pounds was the "all up" weight of my Corvair engine, >with everything but fuel in the lines and electrons in the wires. I also weighted mine as a firewall forward and included engine mount as well as prop and spinner, oil,and baffeling, but not coils or remote filter or anything that was actually mounted to the wall. Anyhow mine came in at exactly 265# for a 3100cc. Joe Horton, Coopersburg, Pa. Make the most out of every dollar. Click here to find websites and services to help invest wisely. http://thirdpartyoffers.juno.com/TGL2141/fc/BLSrjpTFOGe51M9ZWf2ZhMeM2jmGVQYtq7WE47qRJbzIJR0tETwjOIkARva/
KR> Center of Gravity and Prop Spinners
One more thing on fiberglass spinners...I consider them to be safer than aluminum ones. If the spinner comes off on climb out, the prop is much less likely to suffer damage if it hits a composite spinner than if it hits an aluminum one. And as http://home.hiwaay.net/~langford/spinner/ mentions, the store bought aluminum spinner was badly out of balance, whereas my homemade one is as close to perfectly balanced as I can ascertain. Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> Center of Gravity and Prop Spinners
Scott Watts wrote: > You reported an all up engine weight of about 250 lbs for the Corvair > in your KR. What moment did you use? Say from the firewall? I assume > this does not include the prop and spinner, cowl etc...??? >From the CorvAircraft archive: I've always said 240 pounds was the "all up" weight of my Corvair engine, with everything but fuel in the lines and electrons in the wires. That did not include the 2 pound air filter though. My engine's CG is about an inch aft of the center of the case centerline, but mine's a rear starter, so for a front starter it would be slightly forward of that. It also doesn't include the prop, which would be about 5 pounds in the case of a 54" diameter wooden prop. And the mount is a few pounds as well that I didn't count as part of the engine weight. The 240 pounds does include coils, wires, exhaust, and all that stuff, as well as the prop hub. No, that doesn't include the weight of the cowling, spinner, or prop either. I don't know of anybody in the aviation industry that does that. These numbers were for my 3100cc engine. 2700cc engines weigh about 6 pounds more due to heavier GM pistons and cylinders. Grand total being about 248 pounds for a 2700cc Corvair. > Also, I like your streamline spinner/cowl, but notice from your web > site that you essentially made your own custom spinner. I'd like to > get your same look, but do not trust myself fabricating a part that is > required to spin thousands of times a minute. Since the time you made > yours, have you found a commercially available spinner that might do > the trick? If you were to do it over again, what would you do? What > is the diameter of your spinner at the cowl? The part number and place to buy the spinner that I used for a mold is in the first sentence of my "how to build a fiberglass spinner" page at http://home.hiwaay.net/~langford/spinner/. Mark Langford N56ML "at" hiwaay.net website at http://www.N56ML.com
KR> Center of Gravity and Prop Spinners
Mark L., You reported an all up engine weight of about 250 lbs for the Corvair in your KR. What moment did you use? Say from the firewall? I assume this does not include the prop and spinner, cowl etc...??? Also, I like your streamline spinner/cowl, but notice from your web site that you essentially made your own custom spinner. I'd like to get your same look, but do not trust myself fabricating a part that is required to spin thousands of times a minute. Since the time you made yours, have you found a commercially available spinner that might do the trick? If you were to do it over again, what would you do? What is the diameter of your spinner at the cowl? thanks, Scott
