Goldberg Super Chipmunk

Phil Ford wrote: Thanks Jon. I will ring to check your in first. I won't be flying this weekend....:lol:

No problem

Phil Ford wrote: Do they use the same exhaust thread as ASP for instance?

No idea!

JonTappin wrote:

Phil Ford wrote: Thanks Jon. I will ring to check your in first. I won't be flying this weekend....:lol:

No problem

Phil Ford wrote: Do they use the same exhaust thread as ASP for instance?

No idea!

Saito is 12mm x 1 thread apparently. Won't take ASP exhaust me thinks

Wing now covered. White and Red. Wanted white and blue but did not have enough blue so it got red. Beginning to like it after all. :lol: Landing gear back on. Got some fiddling to do the align the wing bolts with the fuselage mounting blocks. Tomorrow, wet n windy Sunday, will probably install my custom servo tray and fit the elevator and rudder servos. Will post up some images later. Done enough for today.....she said.

Phil Ford wrote:
Saito is 12mm x 1 thread apparently. Won't take ASP exhaust me thinks

Why don't you just use the exhaust that's on it?

I will use the muffler but may have to extend or angle the it bit more and I have a quite few ASP / OS manifold adaptors

Some progress at last although I have just seen a a bit of a boo boo. When I made up the servo tray for the rudder and elevator servos I had not allowed room for a throttle servo. :oops: Oh well no big deal just have to cut out another one. The Saito 80 is now mounted although I did have some trials though because two of the the engine mounting brackets lined up nicely with a bearer on the inside of the firewall, this being as the builder was fitting a different engine and was also mounted horizontally. I had to bite the bullet on a very expensive (in my estimation) a right angle exhaust adaptor from Saito (thanks Motor & Rotors who had one in stock). At least now the exhaust will point downwards and back out of the cowl. Next job on top the servo tray remake is the tank plate to hold it in place and also for the securing of battery pack/s. My suspicion is that even with the weight of the lump up front the battery may have to go right up front to avoid adding lead ballast to get the CG right.

Two steps forward and one back. Had to move the engine forward 3.5 mm to give enough clearance for spinner without having to jam the cowl hard back against the fuselage which also gives me a bit of leeway when aligning the prop driver to cowl out hole. Simple enough you would think - but no, the spike nuts that took me ages to install fell out. My hands are to big to get into the fuselage tank area and it was struggle last time. One hour of p***ing about trying to them back in, three cups of coffee and a ball-pein hammer nearby. Finally now I can try the cowl again with the right angle adaptor fitted. A bit more cutting needed. To finalise the exhaust may be a bit of trial though. Re-installed tank after boring out a 30mm hole for the lines to come out. Servo tray remade and servos fitted. Until I know what is happening with the exhaust I am unable to paint the cowl or where to fit the securing screws.

I know it was probably 9 years a go but Ebay has got a lot to answer for.

I used to get fed up when a spike nut fell off, and it would always be the one you couldn't reach. I replaced all my spike nuts with threaded inserts, they cost a bit more, but they do make engine fitting a breeze.

Brian wrote: I used to get fed up when a spike nut fell off, and it would always be the one you couldn't reach. I replaced all my spike nuts with threaded inserts, they cost a bit more, but they do make engine fitting a breeze.

Phil /Brian - "Spike" Nuts a.k.a "Tee" Nuts - My technique for fitting "Tee" nuts is to first drill a hole slightly less in dia than the body
of the Tee nut.
Then using an oiled Socket Head Capscrew & suitable washer engage into the Tee nut and tighten the screw drawing the Tee nut
into the plywood motor mount until it feels solid, for extra safety a dab of cyno on the prongs may be added.
Todate I've never had one drop out - oops ! tempting fate.

Colin.

Guys the issue was where the lower engine mounting holes needed to be lined up with a bearer/brace on the inside of the firewall. This brace was not flat it was made up of a 45% angle of spruce. I believe it would've been required to support the original tank or spacer. As you know spike nuts need a flat surface or indeed so does threaded inserts so I realised I was stuffed. I have 3/4 balsa but not Spruce so I could create and opposite angle to the bearer therefore the nut sees a flat surface (Still following?). Scratching my head I found a little bit of Obechi strip that was 18mm x 10mm. I figured that if I cut down through it at 45% I have what I needed.

The most annoying and get angry moment is how the hell to I get my "big mits" inside that tank bay to stick them on? I decided to drill the holes required in the blocks and press the spike nuts in. Easy! Now get a bolt with a big flat washer and pull the new blocks into place and hopefully the glue will hold them in place. I cannot confirm this 100% because I just cannot get right in there! It appeared to work but after having to remove the engine mounting again this is when I realised the glue had not held sufficiently. Hence my earlier post and rantings.

The reference to Ebay was I found the Chippy on Ebay. It looked okay from the image but after driving up to Coventry and seeing it in the flesh I could see it was in not that good a nick. T. As I still had my original wing virtually intact I only wanted the fuselage, so I took it on. Of course who ever built it used the methods at the time, like gluing in the tank rail! (What happens if you get a tank problem?) In fact gluing everything in. The covering was fading and lifting and until I started to try and tidy it up that I discovered it had been covered in that damn Monokote. Lost interest then until now.