Re: [RCSE] FAI legal F3B winch battery?
David Zucker wrote: Can anyone give me the specifcs on the legal size battery for an F3B Contest. 500 CCA? 5.3.2.2 Launching c) The power source shall be a 12-volt lead/acid battery. The maximum cold cranking ampere capacity should be not more than 275 Amperes DIN, or 310 Amperes IEC, or 460 Amperes SAE, or -- North America 455 Amperes EN. -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] FAI legal F3B winch battery?
Andrew E. Mileski wrote: David Zucker wrote: Can anyone give me the specifcs on the legal size battery for an F3B Contest. 500 CCA? 5.3.2.2 Launching c) The power source shall be a 12-volt lead/acid battery. The maximum cold cranking ampere capacity should be not more than 275 Amperes DIN, or 310 Amperes IEC, or 460 Amperes SAE, or -- North America 455 Amperes EN. OOPS! That was the 2001 rules, which seem to have been changed. a) The winch shall be fitted with a single starter motor. The drum must have a fixed diameter and the width between winch drum flanges shall be 75 mm minimum. The power source shall be a 12 volt lead/acid battery. The cold cranking capability of the winch battery must be specified according to one of the following standards: 300 amperes max. according to DIN 43539-02 (30s/9V at 18 OC). 355 amperes max. according to IEC/CEI 95-1 (60s/8,4V at 18 OC). 500 amperes max. according to SAE J537, 30s Test (30s/7,2V at 0 OF). 495 amperes max. according to EN 60095-1 (10s/7.5V at 18 OC). So yes, 500 CCA in North America (SAE) Sorry for the misinforation :( -- Andrew E. Mileski Ottawa, Canada RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Colour and heat retention
Just another thought on color. I was watching some ravens soar at a distance and angle we often fly our planes. I was struck how well they could be seen both on the top and bottom in the turn. The gloss black showed up well at all angles (the black gave good contrast and the shine gave some glint). I've been toying with the idea of painting a TD ship all gloss black. Any thoughts? Oh and another old thread on direction of turns while in a thermal. Ravens are the only bird I have seen fly in the same direction while in a group. Seagulls and other birds seem to do there own thing. The Ravens will all go one direction, then some wise guy will change and they will all get back into a one way formation after a short time. I read somewhere that Ravens are of the smarter bird variety - I guess it shows in there flying habbits. - Original Message - From: Bob Rice [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, March 16, 2002 12:02 PM Subject: FW: [RCSE] Colour and heat retention There is a very interesting article concerning the painting of gliders and heat at http://www.dg-flugzeugbau.de/index-e.html look under the technology section The general rule Don't use dark colors where the sun can shine on the painted surface Bob Rice Rocky Mountain Soaring Assn. Denver CO -Original Message- From: Bill Johns [mailto:[EMAIL PROTECTED]] Sent: Saturday, March 16, 2002 12:57 PM To: [EMAIL PROTECTED] Subject: Re: [RCSE] Colour and heat retention At 01:56 PM 3/16/2002 -0500, John McCloskey wrote: A LONG while back there was a thread on this subject . I'm looking to paint the tips of a new sailplane. Only I don't want to go the usual red/yellow , Blue /yellow . I seem to remember a post stating that dark green will hold as much heat (or nearly as much ) as black .Was I hallucinating or is there some truth to what I remember ? I did some work some time back and some solar sensors use a very deep green instead of black for measuring incoming solar radiation. It catches an awful lot of solar energy. While on the subject, I've noticed that quite a few TD ships seem to be sporting bare glass fuselages . Does heat affect them in the long run ? Would I be better off to at least paint the nose cone white to keep the UV and temp down around the flight pack and battery ? I've never noticed the unpainted fuse getting particularly hot. Bill -- It comes in pints! Peregrin Took Bill Johns Pullman, WA RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] Converting .dat to .cor in Compufoil
Hi Guys, A lot of you have suggested ways for me to use the .dat files in Compufoil but you have all just told me how to import them into the coords folder and then bring them up. That has not been a problem all along. It is when I try to open the .dat file is when I get the error message (error detected at coordinate #1- 0.999841 -0.000170). My version of Compufoil dates back to Copyright 1992, 1993 so this may be part of the problem. I may need to purchase Eric's most recent version in order to make these things work right. Now, if anybody can tell me how to convert the files over to read like a .cor that would be great cause the .dat files I have right now are not working in my old version of Compufoil. See Ya, Pat McCleave Wichita, KS RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] All black color scheme?
One thought that favors having SOME contrast between tops and bottoms or SOME assymetry in a glider color scheme is that with ALL black, even if it's very visible, it seems that you run the risk at high altitudes/distances of the 'image reversal' problem in which a silhouette-only image can be mentally reversed (as to which wing is closer for instance). Lift, Scobie. Just another thought on color. I was watching some ravens soar at a distance and angle we often fly our planes. I was struck how well they could be seen both on the top and bottom in the turn. The gloss black showed up well at all angles (the black gave good contrast and the shine gave some glint). I've been toying with the idea of painting a TD ship all gloss black. Any thoughts? RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Converting .dat to .cor in Compufoil
Have you tried changing the file name as I suggested. I've done this. All you should need to do is change the file name. Example (filename.dat) change it to (filename.cor). If you have not tried this I suggest you do. After you change the file name it will pull up in Compufoil just like any other .cor file. Later... - Original Message - From: Pat McCleave [EMAIL PROTECTED] To: RCSE [EMAIL PROTECTED] Sent: Saturday, March 16, 2002 10:45 PM Subject: [RCSE] Converting .dat to .cor in Compufoil Hi Guys, A lot of you have suggested ways for me to use the .dat files in Compufoil but you have all just told me how to import them into the coords folder and then bring them up. That has not been a problem all along. It is when I try to open the .dat file is when I get the error message (error detected at coordinate #1- 0.999841 -0.000170). My version of Compufoil dates back to Copyright 1992, 1993 so this may be part of the problem. I may need to purchase Eric's most recent version in order to make these things work right. Now, if anybody can tell me how to convert the files over to read like a .cor that would be great cause the .dat files I have right now are not working in my old version of Compufoil. See Ya, Pat McCleave Wichita, KS RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Converting .dat to .cor in Compufoil
--- Rick and Jill [EMAIL PROTECTED] wrote: Have you tried changing the file name as I suggested. After you change the file name it will pull up in Compufoil just like any other .cor file. If it gives some kind of error message box, just press OK and load the file anyway. Once you get it loaded, you can go save surface coordinates and create a new file that Compufoil will not object to. __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] All black color scheme?
--- Scobie Puchtler or Sarah Felstiner [EMAIL PROTECTED] wrote: with ALL black, even if it's very visible, it seems that you run the risk at high altitudes/distances of the 'image reversal' problem in which a silhouette-only image can be mentally reversed (as to which wing is closer for instance). Scobie is right. I have a couple of dark-blue planes. When flying with fuselage perpendicular to my line of sight and banking slightly, I can't tell whether it's the near or far wing that is low. __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Converting .dat to .cor in Compufoil
Pat, I just checked and it was .arc files that I was changing file (extension) names on. After changing the file extension from .arc to .cor these pulled up just fine in Compufoil, although my version is a later one than yours so not sure if this would work. This also may not work with the .dat files but I could have sworn I had some .dat files that I did this with also. - Original Message - From: Pat McCleave [EMAIL PROTECTED] To: RCSE [EMAIL PROTECTED] Sent: Saturday, March 16, 2002 10:45 PM Subject: [RCSE] Converting .dat to .cor in Compufoil Hi Guys, A lot of you have suggested ways for me to use the .dat files in Compufoil but you have all just told me how to import them into the coords folder and then bring them up. That has not been a problem all along. It is when I try to open the .dat file is when I get the error message (error detected at coordinate #1- 0.999841 -0.000170). My version of Compufoil dates back to Copyright 1992, 1993 so this may be part of the problem. I may need to purchase Eric's most recent version in order to make these things work right. Now, if anybody can tell me how to convert the files over to read like a .cor that would be great cause the .dat files I have right now are not working in my old version of Compufoil. See Ya, Pat McCleave Wichita, KS RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
[RCSE] All black color scheme?
If you ever left your carbon-skinned wing upside down in the sun, you know it will get so hot that a foam core will deteriorate under it and be ruined or it will at least delaminate in spots. Same reason a wing black on top is bad news. RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Colour and heat retention
There's a very good reason that full scale sailplanes are white. It has to do with the strength of epoxy at elevated temperatures...ie. it goes down rapidly as the temp goes up. The first PIK-20's were made in white, orange, or yellow, due to the thermal set / cure nature of the epoxy used, and even they discontinued colors very quickly. You don't see many black cars in Texas, because people don't like leaving their skin on their paint from incidental contact. Ravens and vultures are primarily carrion birds, and there's not a lot of calories in what they eat, so black and it's heating properties are a natural survival tool for them...yeah, I watch a lot of nature shows...I'm an old gas bag...what else am I going to watch?8^) Jack Womack --- Charles Eaton [EMAIL PROTECTED] wrote: Just another thought on color. I was watching some ravens soar at a distance and angle we often fly our planes. I was struck how well they could be seen both on the top and bottom in the turn. The gloss black showed up well at all angles (the black gave good contrast and the shine gave some glint). I've been toying with the idea of painting a TD ship all gloss black. Any thoughts? Oh and another old thread on direction of turns while in a thermal. Ravens are the only bird I have seen fly in the same direction while in a group. Seagulls and other birds seem to do there own thing. The Ravens will all go one direction, then some wise guy will change and they will all get back into a one way formation after a short time. I read somewhere that Ravens are of the smarter bird variety - I guess it shows in there flying habbits. - Original Message - From: Bob Rice [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, March 16, 2002 12:02 PM Subject: FW: [RCSE] Colour and heat retention There is a very interesting article concerning the painting of gliders and heat at http://www.dg-flugzeugbau.de/index-e.html look under the technology section The general rule Don't use dark colors where the sun can shine on the painted surface Bob Rice Rocky Mountain Soaring Assn. Denver CO -Original Message- From: Bill Johns [mailto:[EMAIL PROTECTED]] Sent: Saturday, March 16, 2002 12:57 PM To: [EMAIL PROTECTED] Subject: Re: [RCSE] Colour and heat retention At 01:56 PM 3/16/2002 -0500, John McCloskey wrote: A LONG while back there was a thread on this subject . I'm looking to paint the tips of a new sailplane. Only I don't want to go the usual red/yellow , Blue /yellow . I seem to remember a post stating that dark green will hold as much heat (or nearly as much ) as black .Was I hallucinating or is there some truth to what I remember ? I did some work some time back and some solar sensors use a very deep green instead of black for measuring incoming solar radiation. It catches an awful lot of solar energy. While on the subject, I've noticed that quite a few TD ships seem to be sporting bare glass fuselages . Does heat affect them in the long run ? Would I be better off to at least paint the nose cone white to keep the UV and temp down around the flight pack and battery ? I've never noticed the unpainted fuse getting particularly hot. Bill -- It comes in pints! Peregrin Took Bill Johns Pullman, WA RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Sports - live college hoops coverage http://sports.yahoo.com/ RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Converting .dat to .cor in Compufoil
At 11:41 PM 3/16/2002 -0500, you wrote: Pat, I just checked and it was .arc files that I was changing file (extension) names on. After changing the file extension from .arc to .cor these pulled up just fine in Compufoil, although my version is a later one than yours so not sure if this would work. This also may not work with the .dat files but I could have sworn I had some .dat files that I did this with also. COR and DAT files are basically the same format. My airfoil plot programs can accept either one as long as long as they are in true COR or DAT format. Trouble is that some of the airfoils with a COR or DAT file naem extension are not really in that format. Before going to a lot of work, I would try renaming a copy of the data file with a .cor file name extension and see if it will run. If not, then I have been able to edit some airfoil data files in Excel and get them to work. As a last resort, I have used the Data Entry module to type in the coordinates if nothing else worked and I really wanted to plot that particular airfoil. Chuck Anderson RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
Re: [RCSE] Flutter and Gap Seal Mystery
Mark, Mark Drela wrote: [snip] One very important item I left off my list is the max flap thickness at the hinge line. This has a big effect on the torsional stiffness. Tom Clarkson is using an extremely thin wing, so that's likely one factor there. Maybe Mike Fox's wing is a lot thicker. I wasn't sure whether you're saying thinner is more likely to flutter, or thicker is more likely to flutter? -- James .-_--. James R. Osborn * [EMAIL PROTECTED]| \/ \ | Up and Running LLC * http://www.upandrunningit.com |-. \ _ /\\_/ | Computer and Information Technology Support | '-.\ / \\/| (510) 377-4514 Office * (510) 232-2575 Fax| ' \_/ | `' RCSE-List facilities provided by Model Airplane News. Send subscribe and unsubscribe requests to [EMAIL PROTECTED]
