ORIGINAL: dabevan
Been doing some work on the rear fuz, decided to deviate from Mick's suggestions about servos.
...Micks suggestion for the rudder is to butt the rudder directly onto the top of the servo. I um'd and er'd about this quite a bit before going for a more traditional torque rod approach.
I am building his Lightning kit, similar thing, ignored Mick's design and have gone for traditional servo in the fin with direct pushrod to the rudder, it is not hidden scale like Mick's design but I trust it a heck of a lot more.
ORIGINAL: dabevan
What do people think of this pipe? It is supplied with the kit, but as you can see it is single walled
Again, same with the Lightning, no way am I using the MR pipe with its single row of welds some of which on your photo are split across the joint and therefore doing little in the way of bonding! Being single wall doesn't bother me, I have been using Wren's single wall pipes for many years. So for the Lightning I have just taken delivery of a pipe from Wren, single wall, double row of welds and Wren have lots of experience of making pipes, and most importantly it is Wren's divergent cone thrust enhancing pipe which allegedly runs cooler too, rather than the standard straight wall pipe that loses thrust. If I were you I would treat the MR pipe as spare metal for some other project and give Wren a call to order a pipe.
Harry