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Interested in a winter trimotor cookup (Read 5403 times)
Reply #63 - Feb 7th, 2019 at 5:13pm

Kerak   Offline
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I Love YaBB 2.5 AE!
Roy, Utah

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Nice work, Alf...I see you went with a strong wire LG...looks great! Smiley

Neal
 
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Reply #62 - Feb 7th, 2019 at 3:16pm

alfakilo   Offline
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Status report!

Tissue on, white for the top and grey for the bottom. Working on the tissue decals now.
 

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Reply #61 - Feb 5th, 2019 at 1:19pm

Kerak   Offline
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Roy, Utah

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Raider fuselage complete....

Neal
 

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Reply #60 - Feb 4th, 2019 at 9:45pm

Sky9pilot   Offline
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Alfakilo...sometimes in the trimming process one discovers that with the rear motor anchor, to get the model to trim you have to use quite a bit of weight in the nose.  If you have the option of moving the motor anchor up one bay, you can move the motor up and reduce the weight in the nose thereby extending glide and enhancing other flight characteristics.  So I thought I'd design that option into the plan, so the option could be used without major rework when and if it were decided to move the motor anchor forward.  Getting too wordy now...hope that made sense!
Tom
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #59 - Feb 4th, 2019 at 7:55pm

shipwreck   Offline
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Medina Ohio

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Looks great.
love to join in on this one but time is not on my side.
Paul
 
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Reply #58 - Feb 4th, 2019 at 4:33pm

alfakilo   Offline
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Thanks, Tom for the info and video. I sorta understand the motor explanation but that concept is a bit in the future for me!
 
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Reply #57 - Feb 4th, 2019 at 9:44am

Kerak   Offline
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I Love YaBB 2.5 AE!
Roy, Utah

Posts: 2286
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Had some build time yesterday...got a fuselage started on the Northrop Raider.  As previously stated...design/problem solving as I go...rare bird...no kits or plans available.

I think the point of a trimotor model is to "simulate" the functioning of the two outside engines...unless of course, you're building a jumbo...in which case you may have enough nacelle to get some kind of motor length.  At least...that's the case with my efforts.  There's always the challenge...which for me is merely to get a model with a single motor to FLY.  Roll Eyes

Anyway...basic fuselage structure has commenced...now to add weight.  Wink

Neal
 

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Reply #56 - Feb 1st, 2019 at 12:39pm

Sky9pilot   Offline
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Maxfliart has some great videos on Youtube showing winding and launching multi motor rubber powered models: Here's one Click Here

Not sure just what you're asking in the second question?  Two sets of motor mounts?  If you mean the two locations for the motor anchor, that to give the ability of adjusting the motor and CG with a braided motor.  Sometimes a longer motor is not the answer to the flight performance one is looking for.  So I just wanted to prepare for the possibility of moving the anchor forward one bay.

As for launching multi motor rubber powered models there are several methods.  Some just use their hands to hold all three props till launch.  Others use a strip of foam on a  board or foamboard that will span all the props involved that can be moved away before launch.  Pres Bruning's Connie demonstrates this method very well:  see picture below.
 

If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #55 - Feb 1st, 2019 at 12:28pm

MKelly   Offline
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Helotes, TX

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AK,

Take a look at this video of Dave Rees' Bellanca trimotor.  You'll see he (and Tom Hallman) using a block of foam held in the left hand under the nose of the model to keep the props from turning.  While holding the model ready to launch with the right hand you move the foam down away from the model to release the props, then launch just like any other model with your right hand.

https://www.youtube.com/watch?v=NAE12Bhr99Q

Kinda makes you want to build that Bellanca, doesn't it?

Cheers,

Mike
 
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Reply #54 - Feb 1st, 2019 at 10:32am

alfakilo   Offline
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I've always thought this airplane had a "all business" look to it. Can't wait to see your version!

I'm not sure I understand the reason for two sets of motor mounts?

Another question...how is the model launched when three motors are wound?
 
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Reply #53 - Feb 1st, 2019 at 1:46am

Sky9pilot   Offline
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Well the plan on the internet needed some rework for what I wanted.  So I redrew it.  Here's the plan.  Will still need some tweaking I'm sure as I build this one.  I will modify as needed. 
EDIT OF PLAN #1

Tom
« Last Edit: Feb 1st, 2019 at 6:52pm by Sky9pilot »  

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If God is your Co-pilot...switch seats...
Your attitude will determine your altitude!- John Maxwell
And ye shall know the truth, and the truth shall set you free. Jn 8:32
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Reply #52 - Jan 31st, 2019 at 9:44pm

alfakilo   Offline
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Retired USAF and TWA.
St Louis, MO

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21", Neal. I converted a 3 view into pdf format and then printed that out at a larger size. I thought that 21" was relatively big but in reality for this design, the build would have been easier if I had gone with a bigger model. As it is, with the light balsa I'm using, too much breakage!! The 1/32 stringers are really fragile!
 
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Reply #51 - Jan 31st, 2019 at 8:32pm

Kerak   Offline
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I Love YaBB 2.5 AE!
Roy, Utah

Posts: 2286
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Good lookin', Alf!  I must have missed it...what's the wingspan on your model?

Sure I'm gonna use those bulkheads, Mike...they are made of balsa...albeit very dense stuff.  Grin  I've still got to lighten the load a bit by cutting out things here and there.  Lamination's way too much work for this guy...I'm still hacking and coughing up a storm...trying not to be involved in anything much right now.  I mostly sit and stare at it...is that a bad sign?  In fact...I'm lucky that I've gotten this far on my "Raider."  Shocked  Tryin' to talk it to death first....

I just watched a film produced by the Brits after WWII...they rounded up a bunch of German rocket techs, had them go through the process of assembling a V-2 (A4 to the Germans)...then all the steps to launch it.  Might have been nice duty...away from the front lines and all...but somebody had to be nuts to play with that toy...really risky stuff!

Neal
 
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Reply #50 - Jan 31st, 2019 at 7:51pm

MKelly   Offline
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Helotes, TX

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Sky9pilot wrote on Jan 31st, 2019 at 12:42pm:
Mike...I was thinking around 36" the plan comes out at around 42" if I'm reading it correctly.  That's just a bit big.  My Connie was at 36" and that's a nice size model. 
Tom


That'll be a nice size.  I thought about scaling the Diels plan up just a bit to get it over 36" and eligible for FAC Jumbo Scale, but I have a couple other Jumbo models in mind so I think I'll stick with Dave's ~35" span and see if I can make it a good flyer for regular FAC Scale.

AK, the Couzinet is coming along nicely!

Neal, are you going to use those hardwood formers, or are they templates for laminating frames?

Mike
 
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Reply #49 - Jan 31st, 2019 at 6:34pm

alfakilo   Offline
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Retired USAF and TWA.
St Louis, MO

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General lash-up minus gear. I think I'll forego the wheel spats. Color isn't clear, probably aluminum, I'll go with a light grey from EasyBuilt.
 

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