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| RC Rescue Boat built from Styrofoam |
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| Brass_Machine:
--- Quote from: DavidA on January 03, 2011, 10:29:14 AM ---HS93, ...I tried to upload some picture but I was told it was FULL so no more uploads they where only 131KB... This is the same problem I'm having. I don't know if it is relevant but I'm using Firefox as my browser. Can anyone help ? Dave. --- End quote --- Fixed. The attachments folder was full. I just made it bigger... |
| Brass_Machine:
--- Quote from: DavidA on January 03, 2011, 10:41:38 AM ---Interesting that there have been a lot of pictures posted after I started having the problem. And most of them seem to be via Photobucket. I wonder if it is only the direct postings to madmodder.net that are effected. Dave. --- End quote --- Yup... when you attach pictures, you upload them to the server. When you use photobucket, they are only 'linked', so it doesn't use any space on the server. All fixed now. The attachment folder was full :palm: Eric |
| DavidA:
Thanks Eric. I have moved some of my pictures to photobucket. Dave. |
| Bernd:
Nice looking boat HS93. What are the stats, length, widith,etc. ? Now the big question, what kind of power to make it go through the water? Bernd |
| picclock:
Hi Bernd Nice looking boat - should be a beauty - looking forward to the finished pictures. FWIW I'm with the others as far as propulsion goes, but with the correct 'impedance matching' it could be good. The motors you have are powerful but fairly low speed - they are designed that way for kids vehicles. To get a good match with the propellers should probably be large and if possible 4 bladed. Failing that a gearbox to increase the propeller speed may be the answer. If they are like the ones my kids quad bike had they draw about 12A in use (~ 6 amps per motor). You can check what the original current draw was by knowing the battery Amp Hours (mine were 17) and how long the batteries lasted. From that you can find out if the motors are loaded correctly by measuring the current drawn. The heat problem with the motor is significant as if its too hot the magnets tend to weaken. At the moment I can't imagine them getting hot at all because of the low load placed on them by the propeller. The foam cutting problem is a pain, and although I can get it good enough for my stuff I've never been really successful. I think the problem stems from the fact that differing thermal loads on the wire cause overheating at the edges. In the centre of the foam most heat is conducted away from the wire, this causes the resistance of the wire to fall exacerbating the problem. At the edges the heat is thermally conducted from the unused piece of wire to where the wire is in contact with the surface of the foam thus making that part of the wire hotter. FWIW I found the best results with a guitar string. The frame was H shaped with the cutting wire on top of the H and tension applied with a spring and string on the bottom. The cross bar of the H swivelled. Just my 2 cents worth - please feel free to ignore. Best Regards picclock |
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