How do bees fly?

This is a discussion thread I found on Quora.com:

How do bees fly?

I’ve heard that bees’ wings are proportionally way too small to be able to fly. Studying the aviation field and looking at pictures of bees, it seems plausible that their wings are too small to support them in flight. Yet they fly. Do bees’ wings meet the lift/drag ratio needed for flight, and if not, how do they fly?
Graeme Shimmin, Bsc. Applied Physics and Electronics….
Short answer: Bees use different phenomena to fly than a plane does – translational, rotational, acceleration-reaction, and wing-wake interaction forces produced by the flapping of their wings.

Longer answer:

Most insects are thought to fly by creating a leading-edge vortex that
remains attached to the wing throughout a relatively slow, long stroke, bees do not follow this model.

The secret of bees ability to fly is a combination of short, choppy wing strokes, a rapid rotation of the wing as it reverses direction, and a very fast wing-beat frequency (230 beats per second).

This is the result:


The top red/blue lines show the wings going up and down, the middle lines show the angle of attack of the wings (basically vertical on the way up, and horizontal on the way down) This movement creates lift (the black line) greater than drag (green line) almost all the way through the stroke.

And as lift > drag, the bee flies (yay!)

The mechanisms by which the bee is generating lift are thought to be translational, rotational, acceleration-reaction, and wing-wake interaction forces. However, because of the way the forces scale with velocity, and acceleration, the contribution of the non-translational forces is greater for
shorter amplitude strokes .

This is very different to other insects where the lift is predominately translational at mid-stroke. This gives us the reason other insects seem to be ‘theoretically’ able to fly whilst the bee can’t. The other insects lift mechanism is better approximated by the aerodynamics of an unmoving wing.

The scientist who investigated (Michael Dickinson, an insect flight expert at Caltech) stated:

It is the more exotic forces created as the wing changes direction that
dominate, Additional vortices are produced by the rotation of the wing. It’s like a propeller, where the blade is rotating too. Also, the wing flaps back into its own wake, which leads to higher forces than flapping in still air. Lastly, there is another peculiar force known as “added-mass force” which peaks at the ends of each stroke and is related to acceleration as the wings’ direction changes.

Answer summarised from the paper available here:
http://www.ncbi.nlm.nih.gov/pmc/…

Cool idea for an urban beehive concept

 

Philips urban beehive concept

Philips idea of urban beehive as blogged by CNET

This is a unique approach to an urban beehive. 10 points for creativity though I don’t know how practical this would be. As the plight of the honeybee becomes more known we will see more and more innovative ways to work bees into our everyday lives.

On the one hand it would be great to have a garden hive in every backyard, on the other if you have a bunch of hives that are not managed correctly you may create more problems with disease and pests than you solve by supporting a larger bee population.

Read the entire CNET blog post by clicking here.

Thinking about going with Warre hives

The amount of information available about; bees, hive systems, honey, pest and disease control is amazing. Thanks to technology, discussions can be had with beeks all over the world. I’ve read several books, started reading an array of magazines, reviewed many blogs and bee websites and read posts on a couple of forums. The fun thing about a new hobby like this is you learn about stuff that you did not even know existed…..like, did you know there is a huge black market in honey? Honey laundering…..wow, but that is another complete topic.

The two forums that I’ve joined are both in Yahoo Groups; warrebeekeeping and westsoundbees

The warrebeekeeping group is comprised of beekeepers from all over the world. It is a great learning advantage just to read the various posts. Many of the topics are over my head but a lot of it deals with everyday hive management.

Based the the reading that I’ve done and my basic philosophy of letting nature take its own course has me leaning toward starting out with two Warre hives. I’ve looked at two websites seriously; http://www.beethinking.com and http://www.thewarrestore.com. Both seem to have quality built warre hives. I was leaning toward beethinking as they are located in Portland until I came across a local who is building warre hives. I hope to visit with him in the next week or so and I’ll post the particulars.

My reasons for a Warre:

1) Seems to be more natural for the bees, better resembles the inside of a tree

2) Requires less handeling by the beekeeper

3) Lower start up cost

4) Seems that there is a lower incidence of mites

5) Less complicated (simpler can be better)