Part 1. Engine.
March 2017:
Ive been walking around with the idea to construct a large 14 cyllinder engine, should be about a 7mm bore. Max diameter would be 65mm. The most importand part is that it should be available for mass production: for further models and retail. Additionally, it should have working piston movement and ease of assembly
Luckily i had some expierence building these kind of things:
All of these engines have working mechanisms, and they are a achievement of their own...also they are all mass producible. So if you ever need a Mercedes DIII in 20 th scale...Send me a message.
Since i like the more "obscure" models, ive opted to start a Japanese engine: The Nakajima, Ha109. Sizewise, it should be close to R1830 and BMW801.
Since the core of these engines look pretty similar from outside, and most of the time, the engines will be covered by cowlings, i would be able to change certain parts, turning it into different types easily.
Ive started the prototype phase on late march 2017:
Most of the drawings are lost...somehow...But i dont need those to rememeber ive started from the inside out, With the heart of the engine...
The crankshaft: its comes in 3 diffent pieces, that fit into eachother with tiny splines.
Based on the crankshft and its stroke, cylinder size and way of mounting cylinders, ive started the crankcase:
Lots of filler to be applied:
Entire cranckcase: Note: The rear wheelcase is actually for a Nakajima Sakae 11.
To guarantee all would still fit after casting ive made the moulds as i went along.
I hate this picture below because you can clearly see the poor texture on this prototype. As it turned out, it was because of the wrong type of resin. Admittedly ive never really perfected the surface, then again..in later versions its a lot cleaner. Picture just brings out the worst..in this case...
With the crankshaft working as req'd, i went for the internal parts:
Especially the cylinders and con rods...in total i used 4 different resins to make sure everything is stong, flexible or hard when its supposed to be...
To guarantee the bore is consistent, the cyllinder sleeves are actually metal...Which allows me to polish them with special tooling.
First time test fitting case and cylinder:
Ive experimented with different nose cones:
Slowly but surely more and more moulds,
"Some are actually quite pretty" says the guys who makes them:
Around August '17: Pretty much all moulds finished and major parts casted:
Which means were up for first time build up: I cant remember but judging to this picture, i still have to clean up many parts.
This is bassically the last picture of the actual engine production. In the next update ill post the ones made during a recent overhaul. They show more of the engine itself, looks more cooler i think
Also, if any of you have any suggentions, i really need the constructive critism...
Thats it for now,
Luke,
20th factory.