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Author Topic: B.A.T. Monoplane Dimer  (Read 933 times)
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dohrmc
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« on: September 12, 2016, 09:45:31 PM »

I have had this plane built for quite a while, and finally decided to get off my duff and finish it. Covering it now. With any luck, it will fly well.
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dohrmc
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« Reply #1 on: September 12, 2016, 09:48:26 PM »

I have all the components pretty well finished, so once I finish covering I should be able to have this ready for trimming flights pretty fast.
I have been told 2 loops of 3/32nd should work well. Anyone flown one of these?
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ZK-AUD
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« Reply #2 on: September 12, 2016, 10:27:16 PM »

If this is the plan built by John Ernst, his weighed 14.5g and he hoped it would fly on one loop of 3/32.   1 Loop would be great indoors but maybe not quite enough outdoors.   Looks like you can get a massive long motor in there and assuming your weight is around John's weight I think 2 loops of 3/32 braided would give you a lovely long soft motor run with all the power you need.  I have a 16" span KeilKraft Sopwith Camel that weighs about 23g including rubber and it does just fine on 4 strands of 3/32 even with all the drag.
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flyfac
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« Reply #3 on: September 13, 2016, 12:17:26 AM »

Hi Dohrm,

That's a great design and an excellent flier.

I went through my notes and found the specs for mine.

Weight w/o rubber:  9.7 g
Weight w/rubber:  13.2g. (1 loop 1/8" 3.5 grams Tan II)
Average flight:  100-120 sec.

I only fly this one outdoors, so 1/8" is fine.  Indoors 3/32 would probably be a better option.

Hope that helps.

Best,

Scot Dobberfuhl
Forest Grove, OR
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dohrmc
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« Reply #4 on: September 13, 2016, 08:11:10 AM »

Thank you for the info.  I am not in your class as a builder. You really do good work.  My trusty BAT will be almost twice as heavy as the one you built.

I haven't found much info on the actual plane. Is that the way they used aluminum panels on the real thing? I don't guess it matters much with a Dimer, but I was curious as to where the al-u-min-ee-um started and stopped. (Obligatory Brit speak).
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dohrmc
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« Reply #5 on: September 16, 2016, 02:11:20 PM »

All the components are finished and it is time to stick them all together and see what it looks like. This pic shows the wings being glued in with the correct dihedral.
I hope to have this all done in the next couple of days. Too bad about that work thingy!
I am hanging it up in November and finally retiring for good. (At least I hope it's good!)
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flyfac
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« Reply #6 on: September 16, 2016, 05:04:18 PM »

That's definitely going to fly, Dohrm!

In a belated response to your request for pics of the real one, all I could find in the files was this blurry pic.

There are other online images of the version with skids, but I believe those were drones.

Best,

Scot Dobberfuhl
Forest Grove, OR
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flyfac
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« Reply #7 on: September 16, 2016, 05:05:30 PM »

  .
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dohrmc
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« Reply #8 on: September 16, 2016, 09:40:09 PM »

The plan I am using is the Al Backstrom  plan. Thank you, Al!

I am attaching the landing gear. I pre assembled it, did all the staining, bracing wires and all. By morning, it should be good to go. Hopefully, it is on there straight. If so, I will stick the wheels on tomorrow morning, before I have to go to work

Last, I will glue on the kingpost, and rig the flying wires.  Bad news I work the next 6 days straight, so will have to be creative getting some glides in.

I am using a Gizmo Geezer nose button. Got it from George Bredehoft at His Volare store. Each button has 3 inserts so you can use it on 3 different sizes of wire. Good stuff.
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dohrmc
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« Reply #9 on: September 19, 2016, 11:49:57 AM »

Finally finished it up. Now to balance and test glide the little brute.
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Mooney
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« Reply #10 on: September 19, 2016, 12:00:58 PM »

Looks great. This plane has always interested me.  I admit, however, I don't quite understand its function.  Was it a manned bomb? That idea doesn't seem consistent with the way the British would've addressed a problem.  Ahhh, very well Tommy, now let's get on with it...of course, I'll tell your wife... Alright then...
Or was this some kind of trainer?
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dohrmc
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« Reply #11 on: September 19, 2016, 12:10:33 PM »

There is not a lot of info out there. From what I have read, it was intended to be used to attack Zeppelins and other targets by radio control. They were plagued with problems with this idea, taking off before the radio was switched on caused at least one crash.
The idea was quickly shelved, I believe.
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Mooney
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« Reply #12 on: September 19, 2016, 05:00:28 PM »

Thanks Dohrm, I thought I recalled a radio control guidance but don't consider my memory reliable enough.  That coupled with the fact that I probably read too much on these kinds of things and begin to confuse details.  I do recall seeing a nicely built dime Bat mono floating around at Geneseo on my first ever visit.  Really impressed me.
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scrubs
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« Reply #13 on: September 29, 2016, 11:02:32 PM »

Nice job on these guys. I built one way back and it was a nice flyer once I got rid of my aversion to nose clay.

Question tho. Does FAC allow simulating silver with white tissue? Didn't think they did anymore.

bill
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dohrmc
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« Reply #14 on: September 29, 2016, 11:12:21 PM »

Well, I'm a little slow, don't understand that.

At present carving a prop for the BAT. It is impossibly nose heavy.
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Mooney
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« Reply #15 on: September 30, 2016, 09:41:51 AM »

I think you're correct, Bill.  I say think, because I didn't bother to check the latest book.   But that used to be so.  Too bad, cuz I think it is in line with a dimer's simplicity to have white tissue as silver.  As I think about it, it may have been your BATMono I recall at Geneseo way back then
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ILM Tarheel
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« Reply #16 on: September 30, 2016, 01:38:58 PM »

Per the 2016-2017 FAC rule book: Section II Primary Rules All Events

(paragraph) G. Scale models: metal silver / gray finishes must be represented by silver / gray colored tissue and/or paint. White tissue alone is not acceptable.

Jimmy J
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dohrmc
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« Reply #17 on: September 30, 2016, 08:12:18 PM »

Luckily no one alive knows the actual color of a B.A.T. Monoplane. Impossible to tell from the surviving pictures. I doubt there were many all metal airplanes when it was built.
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scrubs
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« Reply #18 on: December 23, 2016, 10:42:49 AM »

I thought I had seen reference to it being silver doped not an all metal plane. In any case I built mine with white tissue too.

sorry for the belated reply.

bill
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