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Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
rp181 wrote ...
hmm, thought i already said this. FRP is fiberglass reinforced plastic.
Nylon has a tensile strength of 6Kg/mm^2, and those 10mm bolts have 48 mm^2 cross section, enabling them to carry 288Kg each, or 864 total. I think that is ample safety factor. The primary assy weights in at estimated 10kg max. Sometimes it pays to do the math, although I tend to design according to the TLAR (That Looks About Right) method.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Tensile strength, but not shear strength. You need to see the shear ratings on those threads. Although if it was me, i too would also just try it and see what happens.
Also, Nylon absorbs moisture from the air, changing its dimensions. It probably wont be a problem, although it might matter in the future.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Finn -
As usual, your design and execution are world-class.
A question for you about the attachment of the "cylinder mounting flanges" to the "crankcase". It looks like there is a substantial fillet or weld bead all along the junction of these parts. Are the parts secured to each other with adhesive, and this fillet is an external bead of thick adhesive (like RTV silicone or epoxy)? Or are they hot-air welded with a plastic filler rod? Or secured by some other technique?
Your "weld beads" look somewhat similar to the those seen in the plastic housing of Matthias Kallenberger's amazing HV transformers, which sure look like they were hot-air welded.
If you did hot-air weld the parts with a filler rod, how did you get what appears to be such a perfect color match between the housing and the weld bead/filler rod? Or is the apparent color match an optical illusion?
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Coronafix -
Right you are, I missed that one photo caption that mentioned "welding". Still interested in how Finn obtained the color match of the weld bead to the base material .....
Also, you noted that the shear load on the nylon 10mm bolts securing the primary supports was 60% of the permissible stress. Can you provide any details of how you calculated the shear loading on these fasteners? 60% of the permissible load seems high, unless your calcs included some sort of dynamic load factor (e.g. accelerations caused by transportation via truck over a rough road, etc).
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
Herr Zapp wrote ...
Finn -
As usual, your design and execution are world-class.
A question for you about the attachment of the "cylinder mounting flanges" to the "crankcase". It looks like there is a substantial fillet or weld bead all along the junction of these parts. Are the parts secured to each other with adhesive, and this fillet is an external bead of thick adhesive (like RTV silicone or epoxy)? Or are they hot-air welded with a plastic filler rod? Or secured by some other technique?
Your "weld beads" look somewhat similar to the those seen in the plastic housing of Matthias Kallenberger's amazing HV transformers, which sure look like they were hot-air welded.
If you did hot-air weld the parts with a filler rod, how did you get what appears to be such a perfect color match between the housing and the weld bead/filler rod? Or is the apparent color match an optical illusion?
Regards, Herr Zapp
Scott,
Thank you for your kind words.
Yes, all plastic is hot air welded, with filler rod. I also noticed Matthias Kallenberger's work, and realised he could only do it, because he had learned hot air welding too.
It`s not at all hard to do, either. Just keep the heat gun going right, @310deg celcius, and press 1kg on the filler rod, and it comes along nicely by it self.
Colour match is acheived by using a filler rod of the same colour as the base material, in this case RAL 7011.
But this is all going to get covered up, because after first light, the external parts are going to the car body shop for a covering with "as red as possible", like all proper souped racing engines are.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Herr Zapp wrote ...
Coronafix -
Right you are, I missed that one photo caption that mentioned "welding". Still interested in how Finn obtained the color match of the weld bead to the base material .....
Also, you noted that the shear load on the nylon 10mm bolts securing the primary supports was 60% of the permissible stress. Can you provide any details of how you calculated the shear loading on these fasteners? 60% of the permissible load seems high, unless your calcs included some sort of dynamic load factor (e.g. accelerations caused by transportation via truck over a rough road, etc).
Regards, Herr Zapp
You are absolutely right, it should have been 0.25 the permissible stress for shear stress rating.
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