> Please feel free to choose which questions you answer
.
I've got nothing better to do right now so I'll have a go at all of them.
> Is the motor peg the bit of alu. tube through the fuselage between the big discs in your pic?
Yes.
> Is it replaced for flight....
No. It anchors the rear of the motor. The other end drives the prop. Think glorified elastic band.
> ...weight will already have been optimised..
Yes. Aft of the CG so weight kept to an _absolute_ minimum. Long winded explanation as to why available. Send SAE and postal order for 2/6
d to Lurker Industries Product Support Dept.
> Is the length dictated...
Mainly weight as above. Needs to be as short (and therefore as light) as possible but leaving enough sticking out either side (typically 5mm or so) so that a late middle aged fumble fingered fool can extract it to fit or replace the motor.
> What is the purpose of the discs/oversize washers on the ends of the lengths of thin-ish alu. tube?
Nearly right. It is to stop damage to the tissue if the model moves on the retaining wire. The motor peg shouldn't move but it is possible for the peg & therefore model to slip sideways on the wire. The aux. tubes and their discs wouldn't be necessary in a 5 (or 6, 7, VIII) mm threaded tube set up.
> How do the brass bits(presumably ex electrical "chocolate block") work?
Yes ex-chocolate block. Simply to lock the auxiliary support tubes at the right width.
> What is your sequence of set up & operation in the field?
a Remove motor peg from model.
b Fit rubber motor in model hooking rear with motor peg. See also "stuffing stick" or "pushing stick".
c Stooge on the ground. Tent peg or other bit of metal banged through the hole provided for that purpose.
c Mount model in stooge as per pic.
d Hook winder to prop. end of motor. Welly on the turns.
e Carefully hook prop / nose block assembly to motor instead of winder.
f Remove whole from stooge carefully. Holding prop to prevent motor running.
g Chuck model in the air and watch it fly.
h If landing soft enough repeat from c. Depends on outcome of g. <--- There's a bad joke in there if you look hard enough
> Do you need to accomodate different fuselage widths on the flying field ...
Yes.
> how difficult would it be to change M5 to M6, or even M8 (brass bits...)?
Werl... I haven't got an M8 drill bit for the uprights and Wobbly John has already been experimenting with 5mm brass rod...