I recently read the following paper in which the author details his automated optimization for finding laminar flow airship profiles for certain Reynolds Number ranges:
Drag Reduction and Shape Optimization of Airship Bodies, T. Lutz and S. Wagner, University of Stuttgart, Journal of Aircraft, Vol. 35 No. 3, May-June 1998
The principal author has kindly provided the profile coordinates of the optimized airships and thus I have seen it necessary to size a laminar airship using a rendering software (Cinema4D) and to see how it would look to fly a laminar-flow zeppelin.
For a laminar body of rotation to be effective, the surface of the body must be free from imperfections, smooth, and have no wrinkles and have no dimples. These requirements reminded me of the two aluminum airships which flew more than 50 years ago. One of which was the ZMC-2:
It seems necessary to use a thin composite shell with gelcoat on the exterior. The gondola requirement poses a problem, so I propose to use a harness like that of a parachuting student to his instructor. The 100m3 airship is essentially a large buoyant backpack, with a shaft extending from the flyer’s feet through the gas-cell to the propeller.
The prone cycling position has been proven on land-vehicles:
And also on one human-powered blimp…. This is an appropriate harness for the aerial canoe.
A number of unknowns exist, including:
- Is a rudder necessary, or can a swashplated or vectored propeller suffice?
- How much would the exposed pilot disturb the otherwise laminar flow around the airship body?
- Does the pilot need to be enclosed?
- Can a composite hull be made gas-tight and how?
An RC model will answer some of those unknowns. Here are some renderings which I have done in my first day of Cinema4d usage:
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| The pilot will likely NOT fly with his arms extended like the stick-man in these images. |
 |
| The pilot faces forward, side-to-side, and predominantly downwards. |
 |
| This picture exposes the drive-train from the pilot’s feet to the propeller. |
The renderings show an airship with a lifting volume of 100m3, a 3m prop and a 1.83m stick-man for sizing reference. The resulting airship is 16.76m long and 3.6m wide at largest width. The next steps are to build a spherical composite balloon, ensure that the finish is smooth, test the balloon’s gas-tightness with air and with lifting-gas, and learn and refine manufacturing techniques.
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