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| Another version of how not to build a model engine |
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| Bluechip:
--- Quote from: sorveltaja on January 28, 2010, 11:37:42 AM ---Dave, it sure is tricky to wind hair-thin wire. I've been trying that, and there is way too big chance to snap it. Unless you have a delicate winding setup. --- End quote --- Bob Shore mentions 16,000 turns of 44 AWG ( 0.05mm or 0.002") I can't see it, let alone wind it. :scratch: This might be handy ... http://wires.co.uk/acatalog/conversion.html Not for me ... Dave BC |
| sorveltaja:
Once I was interested in making my own pickups for the electric guitar. Wire is somewhat similar size, that is used on ignition coils. There was the site, where the winding how-to tricks were shown. I think, that same techniques applies to both pickup and the ignition coil winding. Only the latter being easier, since it's cylindrical.. |
| sorveltaja:
I've been testing vapor carb with gasoline and ethanol. Neither provides low rpm, no matter how many setups are tried. So I moved back to ordinary carb. With it, engine runs at very low speed, but only randomly. Otherwise it likes to run horribly fast. After all, I have a strong feeling, that it should indeed be possible to get even that small engine to run nice and slow (huff'n'puff'n). |
| sorveltaja:
Last, but hopefully not least, I'm going to make a more standard needle and barrel throttle carb. I can make the engine run already, and that should be enough, but maybe just one more test, before this project is finalized. |
| sorveltaja:
New carb so far: On the left side is needle, next is part, that needs an inlet for the fuel to be made. It has 1mm(0.039") hole going through, and piece of smaller tube (od 1mm, id 0.5mm), that goes to carb's throat. Then is carb body, that has different taper on inlet, and outlet. It has 7mm(0.275") hole for barrel. There is also pair of d-bit reamers, that were made of otherwise scrappy drill bits. Fastening part of the cheap drill bits seems to be softer, allowing them to be filed, if desired. No hardening was done, and still they cut the brass better than I expected :thumbup:. At the right side is the barrel, that has 2mm(0.078") throat. |
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