I don't have one, but have seen a ton of them. There is a pretty large range of variation in Brodak 40s and from batch to batch there seems to be pretty signifcant variations.
Brett
Just like guitars, race cars and airplanes.....setup of the B-40 is everything.
First.....the backplate ears will distort (you can see it) and the gasket will leak if tightened too tight.
I don't overtighten these 3 screws and use blue Loctite on the screws.
The backplate can be installed incorrectly....be sure the ears line up correctly with the crankcase.
The spraybar holes are drilled slightly off center so when looking directly down the intake rotate the spraybar so that the holes are not visible at all.
The spraybar sucks air where it goes through the venturi so wrap plumbers Teflon tape around the spraybar under the nuts.
The needle valve sucks air too.....put a piece of fuel line over it.
Make sure the glowplug is not leaking...put some fuel on top of the head and hold the prop at top dead center and watch for bubbles around the plug....tighten as needed or replace the washer.
These washers are slightly cupped and when new should be installed with the cup facing the engine so the plug flattens out the washer and you get a good seal.
Now the next thing some guy is gonna say that they are not gonna screw around with this engine for these reasons.....too much hassle bla bla..
Come to Tulsa and you can fly it....runs great....takes about an hour to do the job.
About the Vector being designed for the B-40....originally probably not but the current version of this ARF is designed/configured so the B-40 drops right in without any mods or hacking.
My only real complaint is that this ARF has a Z bend on the bell crank.
Not on MY airplane!
I replace that gnarly little wire with a .110 carbon rod.