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Seagull Challenger - First kit Build - First IC

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Richard Clark 226/06/2020 06:56:44
416 forum posts
Posted by Gsky on 23/06/2020 15:29:03:

Thanks for the tip Jesus, I’ve heard there are a few mistakes/omissions in the instructions. I’ll try and have a good read of them and watch mojos videos while waiting for supplies.

Edited By Gsky on 23/06/2020 15:29:32

Yes. You should definitely take note of Jesus' comment and a few other things too, such as the poor instructions.

Basically the plane is designed as an ARTF and Seagull, for some weird reason known only to themselves, decided to not glue the parts together and sell some of them as kits.

But ARTFs are not designed as 'home build' kits The parts have been designed to be cut out by an infinitely patient computer so complicated shapes do not matter, and have a lot of 'keyed' parts so they can to be put together under initial close supervision until the totally disinterested person doing it has become sufficiently 'robotic' to do it by him or her self hundreds of times over with no thought whatsoever.

Written instructions were not required so are just an afterthought and the fuselage (and probably the wing too) will have been designed to be assembled on a jig to avoid banana shaped fuselages and warped wings. You don't have any of that jig stuff.

PS: The difficulty of flying  a model Spitfire is much exaggerated.  The problem for a beginner is they don't have a straight line anywhere so building it involves a lot of carving and trying to get balsawood to bend in two different ways at  once, so it's all very time consuming.  But you won't have any problem with the actual flying once you've flown the Challenger for a while.

Edited By Richard Clark 2 on 26/06/2020 07:09:15

Nigel R26/06/2020 09:54:13
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3981 forum posts
714 photos

yup, bit of plasterboard on a kitchen worktop will do nicely as a build board

gangster26/06/2020 10:19:40
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1035 forum posts
29 photos

Maybe another investment would be a SLEC fuselage jig They are not expensive. Removes any concern of a banana fuselage and keeps everything tight in place while the glue dries

Kim Taylor26/06/2020 17:49:07
318 forum posts
55 photos

If you don't want to 'flash the cash' on a jig, at least draw a straight line on the building board surface and use this to align the fuselage, then pin / clamp it together.

Better than nothing

Kim

David Ashby - Moderator26/06/2020 19:51:34
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Moderator
11033 forum posts
1723 photos
617 articles

The fuselage jig is included with the kit.

Richard Clark 227/06/2020 04:56:53
416 forum posts
Posted by David Ashby - Moderator on 26/06/2020 19:51:34:

The fuselage jig is included with the kit.

But jig or no jig the instruction photos indicating all the formers are glued to one side first is still nuts.

Mike Etheridge 127/06/2020 11:02:58
1554 forum posts
430 photos

The thing I remember about the fuselage repair is that the horizontal tray that supports the fuel tank etc must be introduced prior to the fixing of both the fuselage sides. Could that relate to the gluing of the formers on one side first? I worked without instructions or jig as the plane I repaired was a ready made.

p5310009.jpg

Edited By Mike Etheridge 1 on 27/06/2020 11:05:04

Edited By Mike Etheridge 1 on 27/06/2020 11:07:20

Richard Clark 227/06/2020 12:26:32
416 forum posts
Posted by Mike Etheridge 1 on 27/06/2020 11:02:58:

The thing I remember about the fuselage repair is that the horizontal tray that supports the fuel tank etc must be introduced prior to the fixing of both the fuselage sides. Could that relate to the gluing of the formers on one side first? I worked without instructions or jig as the plane I repaired was a ready made.

p5310009.jpg

Edited By Mike Etheridge 1 on 27/06/2020 11:05:04

Edited By Mike Etheridge 1 on 27/06/2020 11:07:20

"Could that relate....."

No.

Gsky27/06/2020 23:54:01
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17 forum posts
28 photos

Yes the kit comes with some square bar to jig the fuselage, i also picked up some 1/2" plasterboard and t pins to help with the rest of the build.

In terms of power ive seen some used OS max 40 FP 2 stroke engines which shouldn't break the bank and are already run in which is a plus.

fuselage_jig.jpg

build_board&pins.jpg

Caveman28/06/2020 10:22:32
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296 forum posts
242 photos

Hi Gsky, do you gave a copy of the April 2015 article of the Challenger build?

If not it's well worth reading. I can scan the article for you if you would like it.

GDB

Gsky28/06/2020 11:14:30
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17 forum posts
28 photos
Posted by Caveman on 28/06/2020 10:22:32:

Hi Gsky, do you gave a copy of the April 2015 article of the Challenger build?

If not it's well worth reading. I can scan the article for you if you would like it.

GDB

Hi caveman that would be great if you could! Been trying to find a used hard copy but had no luck so far

Caveman28/06/2020 12:56:47
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296 forum posts
242 photos

Gsky, send me a PM with your email address and I'll send them to you.

Best not to put email addresses on a public forum!

GDB

Gsky02/07/2020 13:03:26
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17 forum posts
28 photos

Parts arrived yesterday so made a start on the build.

After a bit of a fight i got the LHS wing bonded together (inc. clingfilm across the whole bottom side). Really glad i got a build board as i couldnt get rid of the bow for the ply. Once tacked together managed to use the pins to square everything up before bonding it all and looks to have come out square. Now ready for sheeting.

Bought some Etronix servos from my local shop to make a start on the electronics.

Also ordered a used 2-stroke OS max 40FP to power the model, which isnt too powerful but should be reliable from what ive read. Would have preferred a model with the main adjuster needle further rearwards to avoid finger nips but i'll just have to be careful!

lhs on board.jpg

bonded_wing_pre-sheeting.jpg

fp40.jpg

etronix_servos_1.jpg

Jon - Laser Engines02/07/2020 13:14:01
5556 forum posts
270 photos

The 40fp was no powerhouse but it should be bulletproof. I think it will be a great combo

Nigel R02/07/2020 14:45:53
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3981 forum posts
714 photos

40FP is a great first engine.

Little to go wrong, reliable runner, easy to start, economical, came with a sensible silencer.

There's two fitted to the twin in my avatar, so you can assume I like them.

Jon - Laser Engines02/07/2020 16:29:58
5556 forum posts
270 photos
Posted by Nigel R on 02/07/2020 14:45:53:

40FP is a great first engine.

Little to go wrong, reliable runner, easy to start, economical, came with a sensible silencer.

There's two fitted to the twin in my avatar, so you can assume I like them.

They also have an unmistakable chortle to their exhaust note at part throttle. Ahh the memories.

Mike Etheridge 103/07/2020 10:46:12
1554 forum posts
430 photos

My repair was covered in Pete Millers 'Don't Bin It Fix it' article:

 

Edited By Mike Etheridge 1 on 03/07/2020 10:48:50

Gsky05/07/2020 00:18:04
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17 forum posts
28 photos

Jon/Nigel, great to hear the FP is a good choice. Looking forward to see what condition its in.

Mike, great to see it flying again and nice video.

Made a bit more progress today. Bonded the sheeting on the LHS wing, use medium CA and added filler to the laser cut numbers and some of the gaps. Missed a bit of sanding on the LE spar so the bottom sheeting sits a bit proud at the root but hopefully i can sand that out later.

lhs sheeting and filler.jpg le close up.jpg

Nigel R05/07/2020 07:56:33
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3981 forum posts
714 photos

Fingers crossed. Even if something is wrong there are always lots for sale on Ebay and the common OS LA 46 is a drop in replacement.

Gsky09/07/2020 14:29:42
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17 forum posts
28 photos

Done a bit more on the wing this week bonded on the underside sheeting and a bit more filling.

The engine has arrived! doesnt look too bad, looking forward to hearing it run. will have a quick read what glow plug and fuel to order, might put together an engine stand to fire it up.

os_all.jpg

os_carb.jpg

os_side.jpg

os_weight.jpg

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