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Author Topic: B-17 F  (Read 8740 times)
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Don McLellan
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« Reply #50 on: March 27, 2017, 11:04:17 PM »

Thanks Ray.  The span is 26".

I plan to run the rubber motors to the wing trailing edge very much like Dave Haught did with his B-17s.  The hook in the pic is not for this model, but shows the idea.  I may have to open up the main wing spar a little at the bottom to clear the rubber, but won't know until I've given the props a run.
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Sky9pilot
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« Reply #51 on: March 28, 2017, 03:10:43 AM »

Looking good Don.  I think that'll work out well for you!
Tom
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Don McLellan
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« Reply #52 on: April 01, 2017, 01:54:03 PM »

Thanks Tom.  My friend with the 3D printer did a couple Paul Bradley design 3 bladed props for me.  These are 3.25" dia and may be a little small.  I'll give them a run in the next day or so.
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OZPAF
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« Reply #53 on: April 01, 2017, 07:58:58 PM »

Neat Don.
John
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Sky9pilot
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« Reply #54 on: April 01, 2017, 08:06:00 PM »

I like the props Don...nice to have that kind of a friend.  Gonna be a nice plane!
Tom
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Don McLellan
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« Reply #55 on: April 04, 2017, 04:45:19 PM »

Did some test runs with the props, well, to destruction.  Have decided to put the model on the shelf for the summer, and maybe dream up a new wing.  There is enough room for a 3.75" dia 3 blade plus I want to revisit a couple of things.
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Crabby
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« Reply #56 on: April 04, 2017, 04:59:44 PM »

Don, I will be the crazy one and ask about that prop.
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Don McLellan
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« Reply #57 on: April 04, 2017, 09:02:31 PM »

Hi Crabby,

I broke the prop getting ready for a fifth test run.  I was holding the prop I had just wound, trying to release a piece of wire holding the second (wound) prop.  Somehow the wire ended up in the then running  first prop, breaking the blade.  My bad, and having three arms/hands would have helped.  Interestingly, there was some vibration as the rubber motors ran down, but suspect if shedding the blade had occurred while flying, the model would have flown, probably badly but still would have flown.  (Very small dia props:  3.25").
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Sky9pilot
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« Reply #58 on: April 04, 2017, 10:49:04 PM »

Bummer about the prop Don...a break for a while is sometimes a good thing to let inspiration take over as you consider fixes!
Tom
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Don McLellan
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« Reply #59 on: April 08, 2017, 03:35:45 PM »

Thanks Tom.  This is a test run on about 250 winds per motor.  One of the rear hooks has to be tightened up a little.

https://www.youtube.com/watch?v=ipH8YqTNZG8
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Sky9pilot
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« Reply #60 on: April 08, 2017, 08:20:57 PM »

Looks like you should have plenty of power when you're ready to continue with this build Don.  I like it!
TomX
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« Reply #61 on: April 09, 2017, 03:13:21 AM »

Very neat Don. I hope you continue with this build.

John
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« Reply #62 on: April 09, 2017, 05:16:22 AM »

Quote from: OZPAF
I hope you continue with this build.
Me too, but I agree that the shelf can be a useful resort, as Sky9 says Cheesy. I wonder if those prop blades have enough area, I must say. BTW I've found that even single-engine, 3-blade types can fly with a blade missing - tho' admittedly that's with balsa blades that are most likely much lighter than plastic ones. They shudder their way to the ground in a fairly orderly manner.

Stephen.
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« Reply #63 on: April 09, 2017, 10:51:23 PM »

4-9-2017

That's pretty cool Don, I'm liking it a lot.  Cheesy

Cheers, Ray K.
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Don McLellan
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« Reply #64 on: August 29, 2017, 05:27:57 PM »

Built the rudder for my B-17 which took as long to build as a wing.  The interior parts of the rudder interlock together. 

Pinned together what I've done so far.
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Crabby
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« Reply #65 on: August 29, 2017, 06:17:30 PM »

Great work Don. I have always admired your courageous enthusiasm for whacky contraptions such as this. Anyway, it makes for great entertainment! You are my hero for doing the nutty stuff I only dream about, after a night out with Jim Beam and Jack Daniels ha ha ha ha
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Don McLellan
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« Reply #66 on: August 29, 2017, 10:14:35 PM »

Thanks Crabby.  Don't usually spend a lot of time with Jim Beam or Jack Daniels, but Kokannee, well, it's 'the beer out here'...............
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Crabby
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« Reply #67 on: August 29, 2017, 10:27:20 PM »

Well those two are bad influences, I steer very clear myself. I guess you found that 3D printed props are a bit fragile? Can they be made from a different material? Are there choices depending on the usage?
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« Reply #68 on: August 30, 2017, 03:24:57 AM »

 Grin what is span, weight?  love those clothespegs as vices

jim Grin
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« Reply #69 on: August 30, 2017, 03:32:20 AM »

  Beautiful as usual Don, that mock up should encourage you.
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Don McLellan
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« Reply #70 on: August 30, 2017, 10:40:22 AM »

Thanks Dave, Jim. 

Crabby, the fellow who prints the props for me has used several different materials over the last couple of years.  (He also prints 1/32 slot car bodies and some of these were rather fragile as well).  The props for my B-17 are the latest material he is using, but as you mentioned, still a little fragile.  I hope to get one or two flights in before I have to switch to conventional plastic two bladers.

Jim, the weight so far is 23 grms (excluding cloths pins) and the span is 26".  The wing area is something like 90 sq ins, so shooting for a weight of around 45 grms.  My wife picked up the cloths pins at Michaels (I think) and they are a huge help when assembling parts.  Art356A also made stringer clamps with the cloths pins by adding a short length of wire and adding balsa 'arms'.  His pics attached.
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Crabby
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« Reply #71 on: August 30, 2017, 11:43:28 AM »

Don, how do you go about figuring out your diagonal ribs in the wing?
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Don McLellan
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« Reply #72 on: August 30, 2017, 12:08:57 PM »

Hi Crabby,

I draw the wing, then guess...........haha............  Actually I draw the wing in at least two views, then lay out each of the wing ribs and diagonals.  I made the diagonals a little longer because I had to sand the ends at an angle.  

Not sure if the attached is my 'latest' sketch of the wing, but it give you an idea.  The ribs and other bits are on 3" x 12" 'sheets' for my craft cutter.  And have to say, I would never add lightening holes to ribs or formers unless I made them with a craft cutter.  The craft cutter does reasonably neat holes so the balsa doesn't get crushed.  Also, the balsa I've used for my B-17 is mostly .045" thick (sold as 1/32).  Turns out my craft cutter will cut material that is close to .045" thick.
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DavidJP
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« Reply #73 on: August 30, 2017, 12:42:03 PM »

Very inspiring and hugely interesting - thanks. 

I have always wanted to build the Harold Towner one which was kitted by Astral which I rember seeing in shops as a youngster.  Far above my pocket money expectations.  I know the plan is available on Outerzone but I am not sure I would have  the stamina but at least I would not have to cope with the egg box timber today.

So anxiously waiting on you finishing this effort.  Well done.
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Don McLellan
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« Reply #74 on: August 30, 2017, 01:34:26 PM »

Thanks David.  Hope to have all the wood work done in the next while.
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