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WonderousMountain

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Joined
Apr 10, 2010
Messages
2,776
Location
Bellingham, Wa
Greetings HBA,

I have obtained a small shed, month to month. Will be pursuing the four winged bi-tandem winged little monster in metal.

Taking engine suggestions, for light adequate power. Back in college, not much related to planes, but gotta get them credits rolling.

Writing Comp is probably the most important of my classes. Will post pictures of progress.

Wing area 120sqft,

square prism bodied,

metal truss construction,

solo placed, tadpole gear.


Out for now, thanks sky brothers.
 

WonderousMountain

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Apr 10, 2010
Messages
2,776
Location
Bellingham, Wa
I guess this got lost in space while.

It's a commuter type committed to light weight, low fuel consumption and useability. Additionally, I would like to keep the span under 20 ft, have retracted gear and removable outree panels.

LuPi
 

lr27

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Nov 3, 2007
Messages
3,822
This is still pretty sketchy. No gross weight, no desired performance, no sketch of how much room for engine and prop, and so on.
As far as square feet of wing, that's not a very useful piece of info by itself. This airplane has 120 square feet of wing area:
Fly-baby-cruising.jpg
This one has even less, only 98, but it has a gross weight more than 4X higher, and a cruise that's closer to 4x than 3X faster:
2_480.jpg
This one has 130 square feet, but needs only 1/3 as much power and has a gross weight less than half of the first airplane:
wpd4820c83_05_06.jpg
This one has 140:
csm_Miles_M100_Student_01_ec4c92467c.jpg
These have about 196 square feet each, so I guess you'd have to use two of your engines per plane:
Lockheed-F-104-USAF-Squad.jpg

Ok, ok, I'm a bad person. But it was fun.
 

WonderousMountain

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Joined
Apr 10, 2010
Messages
2,776
Location
Bellingham, Wa
Some interest in constructing this.
Pretty rough sketch, no doubt, and
the original studio has parts deleted.
Taking off the upper - outer empanage,
It's a trim wing, not a control surface.
octoplane - Assembly 1 Drawing 1.png
Also going to clean up angle excess.
 

pictsidhe

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Jul 15, 2014
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8,815
Location
North Carolina
Going to need heavy spars or really fat airfoils. You'll still have lots of interference drag.

What benefits do 4 wings have?
 

Jay Kempf

Curmudgeon in Training (CIT)
Supporting Member
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Apr 13, 2009
Messages
4,594
Location
Warren, VT USA
Why stop at 8 wings? Why a conventional tail. The smaller and higher aspect ratio the wing the easier it is to make.

Engines have been discussed to death. All about wing loading. Build light and 20hp could work, and up from there.
 

lelievre12

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Jul 15, 2020
Messages
167
You can leave off the elevator. Decalage can be achieved with the wings.
 

delta

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May 26, 2011
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Location
Brookside Utah
The benefit of multi wings to me is based on the huge quantity of 45" CF golf club shafts I wound up with a long time ago. One jig and a bunch of time later... you have a number of small airplanes flying in formation that you can ride around with.MP12B1.JPG MP12B2.JPG MP12B3.JPG mptd1.JPG mptd2.JPG mptd3.JPG mptd4.JPG mptd5.JPG
 

WonderousMountain

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Apr 10, 2010
Messages
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Location
Bellingham, Wa
I'll just stick to the update and explaination.

The rather square fuselage closes out from
Top & Bottom into a wedge, sides straight.
Twin tails of about the same cord as wings,
form a box with the TRIM wing. Pitch control
stays with the BiPandum wings, along W/roll.
IMG_20200921_142628.jpg
Each of the Wing flaps are full span.
 
Last edited:

WonderousMountain

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Apr 10, 2010
Messages
2,776
Location
Bellingham, Wa
Absent mindedly begune back on this wild concept craft.
It's really hard to keep in mind that Stab is a trim wing only.
Just keep thinking ,Oh No, how did my tail get too small!

Screenshot_20220501-191402_kindlephoto-2330557.png
Despite comments which went over poorly concerning external airfoil ridges ,I do like them, here they prevent floor contact when stowed in folded position.

I'll have to go back in and match the original draft better. Plan is to power with Industrial Twin, probably smaller than others.
Drew some wings fo this, to be attached top & bottom, Aluminum, with 3/16ths rivets structural tube & spar caps.
Inspection might need a scope, which given video abilities now seems a well founded expectation.

A lot of fuss about controls I believe is solved through my simple secret of lower set only pitch & roll. Two options remain on wing area, a 100"by 18" unbroken semispan and 90"by 20" specs.
 
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