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« on: December 11, 2014, 10:00:10 PM »
ashok baijal
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Inspired by the Tiger build by Mjet, decided to build one for a 60 size engine.Plan shared by Mjet was printed at 400% magnification to yield full size printout. This build will be a slow one.

Query: The total wingspan is 70 inches but the left wing is slightly bigger (90 cm) as compared to left wing (88.5cm). Mjet feels that there is an error in the drawing. Is it an error or deliberate to compensate for the engine rotation? Expert comment please.
« Last Edit: December 12, 2014, 12:05:59 PM by ashok baijal » Logged
 

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« Reply #1 on: December 11, 2014, 10:27:03 PM »
K K Iyer
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This one (Phoenix)?
http://phoenixmodel.com/Product.aspx?ProductId=19
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« Reply #2 on: December 11, 2014, 10:33:40 PM »
ashok baijal
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No. It is a Carl Goldberg design. Mjet has posted a build log on the forum. He had built it for a 46 siz engine. Mine is just bigger for a 60 size.

14183174348321413611326.jpg
Re: Tiger 60 Planning
* 14183174348321413611326.jpg (37.25 KB, 640x480 - viewed 779 times.)
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« Reply #3 on: December 11, 2014, 10:36:28 PM »
K K Iyer
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Seen asymmetric wings only on C/L like Bluepants (remember?)
Except maybe one Blohm & Voss - truly asymetric!
http://www.militaryfactory.com/imageviewer/ac/pic-detail.asp?aircraft_id=781&sCurrentPic=pic1
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« Reply #4 on: December 11, 2014, 10:39:35 PM »
Mjet
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We have built two tiger and they flew well, very stable and you will love to Fly this model.if you see the wing at centre ,  misaligned centre is easily visible.
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« Reply #5 on: December 11, 2014, 10:42:01 PM »
ashok baijal
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Control line planes generally have a larger left wing (with extra lift) to compensate for the weight of the control line. But why for a rc plane?
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« Reply #6 on: December 11, 2014, 10:45:30 PM »
K K Iyer
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Can't believe it's intentional.
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« Reply #7 on: December 11, 2014, 11:01:15 PM »
K K Iyer
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@ashok baijal
http://www.mikrovisions.com/plans/T60.pdf
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« Reply #8 on: December 11, 2014, 11:06:56 PM »
ashok baijal
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Yes. Same plan but when printed out, the difference can be seen. Better to follow plan for the left wing and repeat the dimensions for the other so that they are symetrical
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« Reply #9 on: December 12, 2014, 07:55:44 AM »
Mjet
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Yes you can go ahead with symetrical wings and belive me, that you will love to fly this model.
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« Reply #10 on: December 12, 2014, 07:58:13 AM »
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FLY HIGH...!!!



What about the formers which are missing in the plan??
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« Reply #11 on: December 12, 2014, 08:04:07 AM »
Mjet
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I had taken the measurement and cutted from ply.
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« Reply #12 on: December 12, 2014, 11:52:42 AM »
ashok baijal
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@Mjet.
The fuselage is box shaped, so formers will be rectangular. I will measure the width and height from the top and side views. Is there an alternate method?
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« Reply #13 on: December 12, 2014, 11:54:45 AM »
ashok baijal
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The plane is pretty huge - The plan literally overflows the dining table.

20141212_085744.jpg
Re: Tiger 60 Build
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« Reply #14 on: December 12, 2014, 12:02:47 PM »
ashok baijal
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To begin with, I traced the wing rib on a piece of paper and then after being satisfied with its size relative to the plan, I traced 16 ribs on 2.5 mm balsa sheets. 3 sheets used.

Next step was to roughly cut the ribs. After drilling two guide holes on each rib, they were held together using two bolts. A bit of sanding and all ribs were sanded to the same size. Next step was to cut the slots for the wing spars. This was done while keeping the ribs bunched together so that all the slots stay aligned.

20141212_085829.jpg
Re: Tiger 60 - Cutting the Wing Ribs
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« Reply #15 on: December 12, 2014, 12:12:58 PM »
sundaram
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Subscribed  Thumbs Up
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« Reply #16 on: December 12, 2014, 12:18:06 PM »
nilharsh
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Wow,
eagerly waiting for big plane
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« Reply #17 on: December 12, 2014, 07:49:41 PM »
Mjet
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Ashok: Method is correct for formers.

As I received replies from experts of Tiger , wings is symmetrical and have same span. Its only a scaner issue.
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« Reply #18 on: December 13, 2014, 12:53:50 AM »
maahinberi
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Subscribed! Seems interesting. Best of Luck sir  Thumbs Up
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« Reply #19 on: December 13, 2014, 10:58:07 AM »
ashok baijal
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I am documenting the build in detail. Maybe boring for experienced builders but could be helpful to new builders making balsa planes.

Take a soft board which is mounted on a hard surface. Mount the plan and cover it with butter paper (Waxed paper) or polythene sheet. Attach the lower spar using pins affixed in a cross pattern on the plan. This will serve as an index for the ribs. Since this is a symmetrical wing, the ribs are not flat on the underside. To avoid any warp in the wing, slide a strip of balsa on the aft side of the wing to serve as a support for the ribs. This will ensure that all ribs are level.

Build 8.jpg
Re: Tiger 60 Building The Wing
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« Reply #20 on: December 13, 2014, 11:07:50 AM »
ashok baijal
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Next step is to align the ribs to the plan. Pin the ribs and ensure that they are vertical. I use a small right angle block to support the rib while I pin it up to the board. Method of pinning is visible in the attached image. Next step is to slide in the top spar. Put some cynoacrilate glue on the joints. Commonly available cyno is of the thin variety. While cutting the joints it should be ensured that the gaps are minimal. If some gap is there fill it was balsa sawdust before putting in the cyno. Dust off excess sawdust before putting in the cyno.

Build 11.jpg
Re: Tiger 60 Building The Wing
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« Reply #21 on: December 13, 2014, 11:20:46 AM »
ashok baijal
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Next step is the glue in the leading edge. Since slots are pre-cut in ribs for the leading edge, the leading edge should align easily. Start by gluing in from the centre rib and glue outwards. This would be followed by gluing the trailing edge. Tack glue the centre rib first followed by tacking the outer two ribs. Thereafter glue each rib.

Once dried, take off the wing from the board and inspect each joint. Add cyno wherever necessary.

Next step is to build the shear webbing. The grain direction of the shear web should be vertical. Affix balsa sheeting as shown. I prefer to fix the web first and cut it after it dries off, rather than cutting it first and affixing it thereafter. Both methods work. Soon you will have all the shear webs in place.

Though not required, I am attaching the shear webs on the inner side also as I have used balsa for the main spar and not a hardwood like spruce.

Build 14.jpg
Re: Tiger 60 Building The Wing
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« Reply #22 on: December 13, 2014, 12:25:50 PM »
Mjet
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What is the material of spar? Wood or Balsa and how you have prepared, pl post in detail.
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« Reply #23 on: December 13, 2014, 12:32:29 PM »
ashok baijal
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@Mjet
Spar is 10mm balsa square - top and bottom. Will be reinforced by a carbon strip to be affixed before the sheeting of the leading edge.
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« Reply #24 on: December 18, 2014, 09:50:55 PM »
ashok baijal
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Affixed carbon strips on the top and bottom spar. Attached sheeting to the trailing and leading edge.

20141213_202311.jpg
Re: Tiger 60 Building The Wing
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