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2m f3a plane. Lexicon.

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Dan Workman31/03/2020 21:23:07
55 forum posts
133 photos

Hi guys, thought i'd do a bit of a build thread on here of my latest f3a plane. I have posted else where so apologies if you have seen some of these pics before.

I started drawing this up on cad last summer with intention of using it this season, its finished and hopefully we'll get some comps later in the year.

Its a 2m f3a model, powered by a 10s, single drive, geared down (belt driven) electric motor. Some more unusual points being it has an all moving tailplane and a swept back wing.

Heres some pics!20191221_152357.jpg

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john stones 131/03/2020 21:37:40
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11456 forum posts
1516 photos

I see you added plenty lightness, would terrify me handling those formers in a build. yes

cymaz31/03/2020 21:57:15
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9197 forum posts
1186 photos

I’m sure it’s like a spider’s web.

SR 7131/03/2020 22:01:48
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433 forum posts
140 photos

You look young there sir, lovely build, following

Peter Jenkins31/03/2020 23:48:47
1529 forum posts
256 photos

Good to see you putting this build on this forum Dan. Makes my Mustang build look a bit pedestrian!

Dan Workman01/04/2020 08:51:17
55 forum posts
133 photos

Thanks guys. Its a bit fiddily at first, once the formers are locked together its a bit more mangable.

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cymaz01/04/2020 09:02:16
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9197 forum posts
1186 photos

Are you able to change the wing and tail incidence? What glues did you use ?

Nigel R01/04/2020 10:17:40
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3756 forum posts
587 photos

Wow. That is some CAD work Dan. I like the fuselage split at the low level, easy to build up straight from the bench.

Does the very sharp taper and sweep back lead to any handling oddities?

Saw your funfly model in the BMFA news too, any chance of some details on it in a separate thread - looked quite an unusual approach to the contest.

Edited By Nigel R on 01/04/2020 10:41:30

Dan Workman01/04/2020 15:57:55
55 forum posts
133 photos

Its an all moving tail so the tail will just sit where it needs to. The wing is set to 0° incidence, as is the thrust line. (2.5° of side thrust). I trim the model for a hands of vertical down line and adjust the up/down thrust in an upline for hands off. This means i'll hold in a bit of up for upright straight and level and a bit of down for inverted. I do this because generaly you will use less mixes and it feels the same whether up right or inverted.

I use cyano to glue all the frame up then mostly aliphatic for all the sheeting.

The swept wing and taper works great, no strange tendancies at all and looks great in the air.

When i build my next funfly i'll do a thread on here

Barrie Lever01/04/2020 17:45:43
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180 forum posts
43 photos

Dan

That is a serious amount of CAD work, what CAD are you using?

Is the model going to be balsa covered and then filmed?

You could have built a lot of E2K models for the time you have put into that project !!

Regards

Barrie

Dan Workman01/04/2020 19:21:25
55 forum posts
133 photos

Hi Barrie, how are you?

I use turbocad, bought it off ebay years ago for about 15 quid, works fine for what i need.

Its sheeted in 3/32 all over. Good compromise between weight and strength. Theres about 70 sheets in total so weight selection is important. Its covered in all white easycote, then im going to spray some kind of design over that.

Dan

Barrie Lever02/04/2020 08:28:19
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180 forum posts
43 photos

Hello Dan

I am OK, very firmly bunkered down at the moment, I am no spring chicken anymore and I definitely don't want to get 'Wu Flu'. How about you?

I use a variety of CAD packages but none of them very expensive or trendy.

Do you have any special preparation of the laser cut joints as you have a lot to handle on this project?

Good stuff, well done.

Regards

Barrie

Dan Workman02/04/2020 14:40:09
55 forum posts
133 photos

Im good thanks. Re. The joints, nope, just glue it all together!

Dan Workman02/04/2020 16:31:35
55 forum posts
133 photos

Few more pics of the fuz build. The nose was all planked with 10mm strips of 3/32 balsa.

Dont know why but some of the pics are rotating 90°

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Ron Gray02/04/2020 16:46:27
1931 forum posts
803 photos

Photos usually get rotated, when uploaded, if you have rotated your 'phone to take them. To avoid them rotating, edit them before uploading, by edit I just mean a simple edit that allows you to save them. They will then upload correctly.

Great work as usual Dan.

Dan Workman04/04/2020 08:21:01
55 forum posts
133 photos

A bit i always dread is cutting the canopy off. Fortunately this one came of ok. I always make the canopy/hatch as big as i can. I hate trying to put batterys or wing bolts into a tiny space!!

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Dan Workman04/04/2020 16:15:41
55 forum posts
133 photos

The transition from turtle deck to fin is always a bit tricky, i learnt this method off another build thread on the gbrcaa website.

The first pic shows 9x 1/4" laminates cut to the profile of the leading edge of the fin. These are then carved to shape you need, taken off then hollowed out with a dremel. Came out about 30g

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john stones 104/04/2020 16:49:24
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11456 forum posts
1516 photos

That looks a bit good Dan, looking forward to your covering job on this. yes

cymaz04/04/2020 16:51:03
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9197 forum posts
1186 photos

Brilliant idea. Can I pinch that?

Dan Workman04/04/2020 18:58:33
55 forum posts
133 photos

Of course you can, i did!

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