The OS VS PTO is running quite nice now. If I let it go on an oval track it screams like the devil itself.
However our triangle course demands loads of power to pull the boat around the buoys and get up flying again.
I had pipe extenders made, and that helps me a lot. Also tried to squish harder, but it has its limitation on 25% nitro, so 0,30 mm is ok.
I`ve ordered 4 or 5 new pipes just to try out if I can gain more torque on low rpm, and I ordered a new piston/sleeve
that should have a few degrees lower exhaust timing. Not sure yet, but I hope that will do the trick.
Anyway it`s a really nice engine!! (It is on sale now, 305 euros) Link
While I`m waiting for new parts to arrive I fired up the new Nova Rossi Keep .21M
It`s quite similar to OS engine, except I did not need to modify the headbutton. Squish at 0,30 mm works fine on this as well.
I have replaced the aircooling head on all my engines with watercooling jacket, and run without any watercooling. Unfortunately I don`t get the needed heat, and that is a challenge as well, makes it difficult to find the correct settings. I found OS P3 to be the best option...
I had to reduce the propshaft to allow the use of Octura M435/3 that I found to be a **** nice prop for our drive style
And I did some mods to an X437/3 that had been in the war, reduced it by 3 mm, and it works good. Andy is making a bucket with new props as we speak, hopefully there will be some good stuff when they arrive.
BTW, the tunnel is a AN-660, Norwegian design by Andreas Nodland