Thank you for your comment Kevin. You've made me realise that the servos we use today are more powerful and a good deal lighter than those used on the original Moonglow. Perhaps a couple of decent spec 9g servos would do the job. Certainly a bonus to be able to trim each servo individually. Perhaps do the same with elevator and rudder, dispense with the long push rods and fit the servos to the rear of the fuselage. My original thoughts were to use pull/pull on the rudder and a 6mm carbon fibre tube for the elevator pushrod. I'll have to drop some parts on to the Boss's kitchen scales and do a few sums involving weights and distance from the C of G. Right! That's Saturday night sorted, I don't like Saturday night TV offerings anyway, so nothing lost there.
The fuselage is in the first stage of assembly. Sides with triangle reinforcement, three formers and good old fashioned beech engine bearers. The upper and lower parts of the fuselage are from thick
sheet balsa. I've considered changing the structure from balsa to polystyrene foam. The plan calls for the top decking to be made from 1/2" sheet balsa, a lot of carving and a lot of waste wood. The underside of the fuselage is similar but from 3/8" balsa. Once again, I have considered using foam but I am torn between building a model to the original design, or creating a model that looks like the original design but uses materials not available way back in the 1960s. I suppose that as long as I keep to the original lines of the model, the composition of the materials used is of little importance, if foam had been available then, I'm sure it would have been used.
Phil, I have a feeling that David T will have something to say about your addition to my "Thank you" comment. May I suggest you have a look at your reply and revise, you'll only get a nudge from you know who if you don't.
Not a lot of progress today, finished the second sanding of the fin and rudder, and made a start on rounding off the leading edges and tips of the whole tail assembly. Slow work as I don't want to sand through the sheet covering again. I trial fitted the tail plane and fin and rudder with the aid of some 3M tape holding things together. Bit of trimming to do at the base of the fin as there's a bit of a gap, nothing serious. Quite encouraging to see that the dry assembled bits look remarkably like the original in the photo from 1968.
After wondering whether to stick to the original control system of one servo and bell cranks for the ailerons, I'm going to use one servo for each aileron, pull/pull wire for the rudder and a 6mm carbon tube as a pushrod for the elevator. All these servos will be Spektrum A 6180 Digital Servos. The throttle will be operated by a tiny Spektrum DSP 75.
The following user(s) said Thank You: Colin Arnold, Kevin Ross
David, I'm saddened by your withdrawal from the "Arena". Your observations have always been a delight as well as a reminder that our language needs to be cherished. What would happen if we were to allow the "Woke" people to take over for instance? Doesn't bear thinking about. Anyway, it's nice to have a real spel chequer on the job, this Window's one keeps missing things.
Moonglow's fuselage sides are a two piece item, joined by a laser cut "dovetail ". The dry assembled joint is quite loose, and the sides need to be jigged while gluing. Unfortunately the scorching around the edges of the parts can't be hidden. This is a nuisance as the fuselage is to be covered in translucent Diatex 1000, and the marks will show through. Can't put a sticker over the area as it would be in the wrong place. Its a pity that someone hasn't invented balsa coloured paint, but that might be the way to do it. Water based acrylic artists colours? Might be worth a try. I'll have a mug of coffee and a chocolate digestive while I think about it.