freebeard's Reverse-Trike thought experiment

[aerohead]

So, this project deserves it's own dedicated thread. We'll leave the Rolls-Royce to it's own.
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freebeard's starting specifications are:
* reverse-trike
* 'belly tank' derived body, about 36-inches in diameter ( 914.4mm )
* 'truncated' aft-body
* 'open' double A-arm suspension
* 6-inch wide tires, of 24-inch diameter ( 152.4mm X 609.6mm )
* 80- horsepower ( 59.656- kW )
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To go from 'here', I'd need:
1) the diameter of the 'tank'
2) the non-truncated length of the 'belly tank'
3) the length 'after' truncation
4) ground clearance
5) maximum width of trike, from outside-to-outside surfaces of wheels
6) thickness of the tubing which forms the A-arms
7) width of the A-arms, front-to-rear, as viewed from the side of the trike
8) diameter of tie-rods
9) since the A-arms are not streamlined, will there also not be 'fillets' where the A-arms meet the body, and meet the wheels?
10) we'll ignore the rubber hydraulic brake lines/ tubing
11) will the wheels be exposed, or inside fenders/streamlined fenders?
12) will the exposed portion of the rear wheel be 'naked', or faired in?
13) are there 'openings' in the body for a radiator, oil cooler, etc.?
14)is there some form of 'canopy' for the driver's head to project into, above the 'body'? Size?
15) are the wheels covered, whether inside fenders or not?
16) any 'scoops' or NACA submerged inlet?
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Would it resemble a 3-wheeled version of the 1952 So-Cal Belly Tank Lakester?

[freebeard]

Thank you for your attention.

Some of this will need to be defined
1) through 3) to be determined
4) Breakover angle is 20 degrees on a 75" wheelbase
5) is 62"
6) through 11) to be determined
12) through 16) dependent on class rules.


https://external-content.duckduckgo.com/iu/?....&ipo=images

One 'cafe racer' saddle, foot brake moved to the rear, handlbars inverted. Blister canopy may be required unless the handlbar shaft can be shortened and the motor controller moved



Ignore the fourth wheel; that was to fit class rules.The rear truncation (I believe) should be like this:



Modified to contain the suspension and wheel.

I hope to get over to the Westside this week, for information gathering. Mostly for putting a drivetrain/suspension in the back of my '58 Baja bug.

[aerohead]

Thanks, I'll be back Thursday unless gravity reverses.
Honk if you have a small one................ and I'll see you at the bottom!

[freebeard]

Here is the loft line. Body width approx. half the height (times two taper). Possibly a triangular section like the Messerschmitt ME-262 or a shark. All possible with Blender's Geodesic Dome plug-in.

I like the idea of a two-wheel bogey and a 40% truncation with a b*tt trumpet.

[aerohead]

Originally Posted by freebeard

Here is the loft line. Body width approx. half the height (times two taper). Possibly a triangular section like the Messerschmitt ME-262 or a shark. All possible with Blender's Geodesic Dome plug-in.

I like the idea of a two-wheel bogey and a 40% truncation with a b*tt trumpet.

* So, we're not doing the 'belly tank' body now? If so, you're going to be responsible for frontal area. I've done them and they require six hours for a 'manual' solution ( and that's with a technical image already provided, plus a 'massive' photo-enlargement [ 18" X 36" ]).
* All the exposed suspension dimensions will be dependent upon the forward elevation view of the main body in true length, and the remaining distance between the body and inside face of the wheels. I'll wait.
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* We need a decision on whether there will be a canopy, and its dimensions.
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* The 'new' side elevation and its 'underbody profile will determine how much of the rear wheel will be exposed to the airstream.
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As to the b*tt trumpet truncation, can you clarify whether your talking about the aft-body being sliced off at 40% of it's total length, and removing 60% of the aft-body, or sliced off at 60% of it's total aft-body length, removing the last 40% of the body's tail? I can't tell from the orthographic projection. I need to see the body in side elevation, in true-length.
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* The drag of every component and feature must be calculated individually, then combined, allowing for hook-vortice interference drag at all intersections.
We've got to have a complete and dimensionally correct picture of the final vehicle to do the math.

[freebeard]

Thank you for you attention.

[aerohead]

Library will be open Monday. I'll catch up then.
Heat's going to be a little better today and I'm going to take advantage of it. We have 40-acres of park and trails that have got to be maintained.
115-F yesterday.

[freebeard]

Try a damp washcloth on the back of your neck.

* So, we're not doing the 'belly tank' body now?

The distinction is Lakester vs Streamliner.The belly tank was the low-cost alternative post-war. The GM Ecotec lakester used a proprietary body.


https://external-content.duckduckgo.com/iu/?....&ipo=images

That lowered 'equator' is something I'd emulate.

[aerohead]

Originally Posted by freebeard

Try a damp washcloth on the back of your neck.



The distinction is Lakester vs Streamliner.The belly tank was the low-cost alternative post-war. The GM Ecotec lakester used a proprietary body.


https://external-content.duckduckgo.com/iu/?....&ipo=images

That lowered 'equator' is something I'd emulate.

* Okay, no 'circular' cross-section.
* Is the body going to 'look' like the 2009 AST- I in side elevation view?
* If so, are the wheels that you've shown are properly-scaled to 24-inches ?, because, if so, I'll be able to scale the height of your overall height from the AST ) I bought a brand-new millimeter ruler this morning at Kroger, on sale for a buck. [hope they don't throw me out of the library].
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Clarifications:
* the width will be 1/2 body height, as measured by subtracting the ground clearance from the overall height?
* ' 2-x the taper' I don't have a clue as to what that means.
* and I still need you to define what you mean by '40% truncation '
* and what goes behind the b*tt trumpet ?

[freebeard]

Clarifications:
* the width will be 1/2 body height, as measured by subtracting the ground clearance from the overall height?
..See Permalink #3 in the RH Barnard on templates thread.
* ' 2-x the taper' I don't have a clue as to what that means.
..Taper on both sides
* and I still need you to define what you mean by '40% truncation '
..It's a line on your graph from 2009
* and what goes behind the b*tt trumpet ?
..Maybe half the back tire?

The purported body would be an asymmetrical ellipsoid, front to back and top to bottom , but not side to side. Cross section could be half circular, but superelliptical might give better cross-wind performance.



Rotate this back to get the shark body profile. Tires are 145-15.