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TomBoy 48" kit

Advice on wood selection.

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Gary Murphy 125/05/2019 21:36:50
378 forum posts
14 photos

Done a couple of simple builds and fancy another. I wanted a good quality cut this time so got a Bel-Air Partial kit. So I need to buy strip and sheet OR all sheet and strip myself.

The supplied plan is good quality also BUT it gives no direction for wood hardness at all. The spars do not state balsa or spruce.

I am not going to build this with great skill so in general can anyone give a idea on balsa I should be ordering?

Martin McIntosh25/05/2019 22:27:49
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2921 forum posts
1073 photos

I built mine quite a few years ago but seem to remember using hard-ish balsa for the spars, the rest can be as light as you can get. The whole model will be very light anyway, especially if covered in Solarlite or similar.

Percy Verance26/05/2019 07:45:36
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8108 forum posts
155 photos

Mmmm, I had no idea Belair did a partial kit of the Tomboy. I know the Mick Reeves offering is a full kit though.

Gary

As Martin rightly points out, the Tomboy won't be a weighty model with great mass so you can really think in terms of fairly lightweight structure. That said, the key parts of the structure need to be up the job. I woudn't use spruce if if it were specified, for reasons I've outlined here many times. Hard/stiff-ish balsa strip ought be be adequate. These harder balsa strips should be used for the wing spars, plus the fuselage longerons ( the four *corner* lengths). Some stiffer balsa as tailplane spars might be good too. As for the sheet balsa, I'd use a medium/soft grade. Again, the Tomboy doesn't need to be built as strongly or robustly as the avarage sports model. It just wasn't intended to be that way.

An easier route to all this would be to order your balsa from the Balsa Cabin over the phone. Tell them what you're building and outline the grades of balsa you'll need, and you'll get what you asked for Gary. The Balsa Cabin is good - perhaps even the best - at that......

 

Edited By Percy Verance on 26/05/2019 07:50:53

Gary Murphy 126/05/2019 10:09:07
378 forum posts
14 photos

I forgot to add "superior" to the TomBoy title.

Percy Verance26/05/2019 10:12:19
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8108 forum posts
155 photos

If it's superior you're after Gary, then I'd definately recommend the Balsa Cabin.......yes

By the way Gary, did you mean Tomboy Senior rather than superior?  The Senior was/is 48inch span. I've only built one Vic Smeed model aircraft in my time, although I'm presently building one of his boat designs ( a Moonglow from RBC kits). He did just as many boats as aircraft it seems......

 

Edited By Percy Verance on 26/05/2019 10:40:23

Phil Green26/05/2019 12:47:58
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1515 forum posts
308 photos

Keep the back end as light as poss wink

top.jpg

underside.jpg

Gary Murphy 126/05/2019 13:07:21
378 forum posts
14 photos

Sorry guys it is indeed the "senior" !!!!!

I am not the greatest builder,if it flies at all I am pleased.

I was going to go with a diesel BUT defo decided to go electric. Especially after seeing Phils Pictures. I am going to ask details about that if its a TomBoy Senior, That motor seems way small!

If you are still looking Phil can you give details and tips please?

Piers Bowlan26/05/2019 13:26:24
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1869 forum posts
45 photos

Perhaps if you cut a hole in the bulkhead before you build the model you won't require so much lead up front. Just move the battery further forward through the bulkhead to balance.

It is such a light model you won't need a very big motor or battery to power it.

My 2p's worth!

Percy Verance26/05/2019 13:39:29
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8108 forum posts
155 photos

Tis just a guess, but looking at that stick mounted motor plus the prop saver, I'd say it was the original 30 odd inch span version Gary.

And, given the weight Phil has had to add at the front, keeping the back end light is sound advice.......as indeed is the advice given by Piers regarding a hole in the bulkhead mod. 

P.S. Love the stitched on undercarriage..... yes  Takes me back to the days of C/L flying when we did our own stitched hinges.

 

 

Edited By Percy Verance on 26/05/2019 13:45:06

Percy Verance26/05/2019 13:46:45
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8108 forum posts
155 photos

Wow! I just realised there's weight on both sides of the motor plate...... secret

Martin McIntosh26/05/2019 15:28:28
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2921 forum posts
1073 photos

The Tomboy 48 is the Senior Tomboy. I use a Mills 1.3 which is what it was designed for. If you really must go leccy then you may as well use a large battery rather than add lead.

Martin McIntosh26/05/2019 16:10:23
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2921 forum posts
1073 photos

Yer tis, a bit grubby after a long layoff.

tomboy 48 001.jpg

tomboy 48 002.jpg

tomboy 48 003.jpg

PatMc26/05/2019 19:58:13
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4199 forum posts
521 photos

Gary, the 3rd post down in this link contains a downloadable pdf file of original article for the Tomboy Senior.

Gary Murphy 126/05/2019 20:15:19
378 forum posts
14 photos

Thank you Pat, very helpful.

Phil Green30/05/2019 00:43:18
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1515 forum posts
308 photos
Posted by Percy Verance on 26/05/2019 13:39:29:

Tis just a guess, but looking at that stick mounted motor plus the prop saver, I'd say it was the original 30 odd inch span version Gary.

No its the 48" Tomboy Senior, rudder only S/C and the motor is the old favourite "Blue Wonder" 1400kv.  It runs from a 3S 1000 and an 8x3.8 slowfly prop. Its about 90 watts flat out but cruises nicely at about half.

 
Cheers
Phil

 

Edited By Phil Green on 30/05/2019 00:44:17

Gary Murphy 130/05/2019 09:36:56
378 forum posts
14 photos

The plan I have states its a boddington model from smeed original.

Seen pictures of other tomboys and seniors and some have diagonal braces on the fuselage sides. the plan I have show none. is this a personal thing or are there other adaptions of plan.

is it worth doing ?

Simon Feather30/05/2019 11:59:04
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235 forum posts
170 photos

remember this other Tomboy thread....

**LINK**

Gary Murphy 130/05/2019 13:59:42
378 forum posts
14 photos

Simon,leave it out! I have trouble building one they flies normally.

David Davis30/05/2019 17:13:22
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3399 forum posts
598 photos
Posted by Gary Murphy 1 on 30/05/2019 09:36:56:

The plan I have states its a boddington model from smeed original.

Seen pictures of other tomboys and seniors and some have diagonal braces on the fuselage sides. the plan I have show none. is this a personal thing or are there other adaptions of plan.

is it worth doing ?

I once built a Tomboy and when I unpinned the fuselage from the building board it went out of shape. I probably hadn't fitted the sheet between the first two uprights but if I were to build another I'd certainly use diagonals.

Phil Green02/06/2019 11:56:20
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1515 forum posts
308 photos

The trick is to steam the bent bits so they retain their shape before pinning down

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