GREENLEY TUG BUILD THREAD 88"

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

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 28 Jan 2019, 20:18

some random pics, the 3mm balsa LE IS NOW ADDED - but no pics
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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 » 21 Feb 2019, 01:11

hi all

ok well back to doing a bit between baby and 5 year old dramas etc

Sanded the root ribs to match nicely ( remember i glued a few spare ribs onto the root then sanded back), got the ply sheeting cut to size on a brilliant saw the local cabinet maker has at his disposal - i actually had a good amount of blood on the building board as i was cutting with a nice sharp blade and ran over the side of my finger .....then i got clever and asked the cabinet maker to assist.

Sanded the servo hatch covers and the LE ply covering to match with a nice smooth joint. Struggling a bit with the tip design and thought about simply cutting up my last 2 ribs and making a wing tip like the stick has ?? thoughts on that anyone......??
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john greenfield
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Re: GREENLEY TUG BUILD THREAD 88"

Post by john greenfield » 21 Feb 2019, 08:31

Wayne
The tip is just a sheet of 1/4" (6mm) balsa sheet stuck onto the last rib and angled up at 45 deg. we do this by cutting the front and rear spars to the correct angle and just sticking the balsa sheet to the ends of the spars. Then, using the ribs as a guide, sand the balsa to the correct shape top and bottom before adding the ply sheeting to the wings. Ply sheeting is also added between the front and rear sheeting from the last rib out to the balsa tip.

Hope that helps.

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

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

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 21 Feb 2019, 20:45

great thank u John

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

Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 21 Feb 2019, 20:47

if anyone is interested did a bit of design on a closed loop system for my 50 cc extra last night.
just straight off the shelf hangar 9 arm and a bunch of SIG products. The head of the bolt fits perfectly into the hole on the servo arm.

obviously a sheet of ply will fit between the 2 sig spruce blocks
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Wayne Thompson
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Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 26 Feb 2019, 02:48

firewall edges cut to 4 degrees both sides thanks to the cabinet makers fine machines!
right thrust sorted and more glue area - thanks for the idea Stu.

second picture is a bit exaggerated - but u get the idea.
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Wayne Thompson
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Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 27 Feb 2019, 18:52

With a few calls to STU once again a plan was hatched - those wing tips grrrr. there seems to be a few things to mention here and i think the pics help.

Raise the TE by the same amount on both wings when it comes time to glue on the 45 degree tip so that they are even..... remember that with the wing raised the same amount u can transfere the measurements from the one wing to the other and expect the same angles and the same aerodynamic results ( or in my case - as close as possible ).

My one tip rib is a bit curved by 2 or 3mm so i need to align with the straight edge and work from there on both. As the spars are all sticking out i took a 45 degree protractor and marked the spars and cut. the 3MM BALSA LE i cut too short AND IN THE BEGINNING i forgot to camfer the tips CONTACT edge to get a better glue joint onto the rib..... this changes the contact point of the tip to the rib / spars and the LE / TE so had to recut them all and re align.

once glued in position run a ruler over the wing and mark where it contacts the tip ( which is oversized ) and mark. u will then cut and shape to that line.

top and bottom.

u fill the gaps with scrap and sand.
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Barry_Cole
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Re: GREENLEY TUG BUILD THREAD 88"

Post by Barry_Cole » 27 Feb 2019, 20:09

This is the way I did mine.

I left the spars long, and cut the ends out of 1/8" balsa as per the drawing. The spar slots are not deep enough, but I just deepened them until it fitted at the correct angle I made then 45 Deg from the top surface. When they were glued in, I got a piece of about 2" wide timber 24" long, and stuck coarse sand paper on the last 6 ". The wood then rubbed on the main ribs, and the end got sanded to the correct size and angle. After sheeting I stuck 1/32" ply on the end, to stop damage in the event of a 3 point landing.

It's a nice place for stickers too.

:shock: :shock: :shock: :shock:

BC
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Wayne Thompson
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Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 28 Feb 2019, 18:43

Thank u for sharing the profiles!!

Wayne Thompson
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Joined: 17 Sep 2018, 04:56
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Re: GREENLEY TUG BUILD THREAD 88"

Post by Wayne Thompson » 28 Feb 2019, 18:45

well i finally stuck my tips on and took some pics showing the spaces to fill later and the way i drew the profile wit a ruler. just a bunch of pictures really.

In 2 months time i will be moving closer to the air field !!
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