GREENLEY TUG BUILD THREAD 88"

Be kind to our tug pilots, we cant do without them.
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Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 25 Sep 2018, 20:54

I bet the worst is the guys who make changes and then try complain " it dont fly right" :-)

Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 26 Sep 2018, 21:22

so .......as promised my sad story on how NOT TO DO THE WING OUTER TUBE.

Presuming you read the word document where you will see i used car wax as a very unsuccessful release agent, finally managed to get the tube off ( a thing of beauty i might add :-) ) then needed to reseal where i split it lengthwise so cyno 1.5oz fibreglass over the joint.......... get some tea this is where it gets good........

the system was simple and fool proof - hmmmmmm :-(

anyhow i was sliding the tube out a little at a time as i was using the cyno to glue the fibreglass in place. this gave me a little shape and strength to the area i was working on without gluing the aluminium to the fibreglass permanently.
for some weird reason i left the last 6 inches of tube in the outer tube just as i was about to finish and pat myself on the back, yup - very stuck and %$#*$%#%! ..................and then broke the tube trying all sorts to try get it off. just fantastic i thought.....the worst was that i could have saved the first 90% and used on the 1 wing half without issue!

what i can not tell you is that there is enough room to have done the job with an extra coat of 6oz cloth for extra strength if needed.
the local hobby shop was kind enough to give me some PVA for the next attempt.

Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 27 Sep 2018, 02:36

ok, finally got the wing plan printed.

thought i would share some pics of the bits that are important to me. The shear webs are 1.5mm and im struggling to find it right now - i can get 2.5 and 1mm no problem.
John , could i do 1mm both sides if i cant find 1.5mm (1/16 " ) ?
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Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 27 Sep 2018, 02:38

and now for my great addition to the workshop : direct from the boat shop..... my new coffee cup holder so i stop spilling on the workbench.
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Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 27 Sep 2018, 02:45

In the pics you will see there are a few ribs that are 6mm (r1 and r4 ) even though the plans are drawn 3mm. The front and back spar sets are different thicknesses and there is a 3mm balsa false LE .

There is balsa below the joining tube and webs on both sides of the tube for the first ribs.
There is 1/32" ply from the LE till 8mm spar and then again TE towards the 6mm spar.....plus cab strips.

Must admit you pick up a lot more info when looking at the actual plans versus using the laptop.

This weekend hopefully make a new tube sleeve and find the 1.5mm ply.

john greenfield
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Re: GREENLEY TUG BUILD THREAD 88"

Post by john greenfield » 27 Sep 2018, 07:53

Wayne Thompson wrote:
27 Sep 2018, 02:36
ok, finally got the wing plan printed.

thought i would share some pics of the bits that are important to me. The shear webs are 1.5mm and im struggling to find it right now - i can get 2.5 and 1mm no problem.
John , could i do 1mm both sides if i cant find 1.5mm (1/16 " ) ?
Wayne
1mm ply on both sides will be fine if you can't find any 1.5mm.

Regards

John
AEB = Aeronautical Energiser Bunny (with thanks to CW)

Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 27 Sep 2018, 21:52

Brilliant John thank u , some good news for the weekend !!

I am presuming we are on the same wavelength and the 1st rib webs still need to be 1.5 or THICKER both sides as the loads must be pretty big in that "area" :-)

cut the new fibreglass for the new wing tube sleeve last night then on the couch with baby and watching the history of the avro vulcan!!

what a lovely sound - cant beat the noise level!

john greenfield
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Re: GREENLEY TUG BUILD THREAD 88"

Post by john greenfield » 28 Sep 2018, 08:01

Wayne

If well fitted hard balsa is used as packing between the tube and the spar then you could use 1mm ply on both sides in this area as well.

AEB
AEB = Aeronautical Energiser Bunny (with thanks to CW)

Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 04 Oct 2018, 21:02

Righty-oh on we go again....

Not much progress after weekend but managed to do 3 coats car polish and 3 coats of pva release agent.
The drama continues with the pole falling off my make shift hanger just after a perfect 1.5oz coat of fibreglass added ( funny that - always just after a perfect job) .
Needless to say the wet glass was pulled into a disastrous shape while trying to catch it and wrecked it all.

So ..... quickly to the 6oz to use the left over resin and finally done. Two days later a bit like rubber and a day later finally dry - whew!! Anyhow seems the PVA and car polish aint a good mix so cut off the outer fibre tube again. Seee the pic as i found a usefull tool to help peel it off :-)
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Wayne Thompson
Posts: 59
Joined: 17 Sep 2018, 04:56
Location: New Zealand

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 04 Oct 2018, 21:04

Now that is all done i have to just touch it up and add a few extra layers to build it up to the diameter of the holes in the ply ribs then it will be real strong as well. finally. Next step after that is the tail wheel set up.

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