[Stoves] Experiences Using a Hand Crank Generator for Fan Stoves

[Boll, Martin Dr.]

Hi fan fans and all!
	I thought about omitting electrically driven fans and replacing them
only by a mechanically (hand-) driven radial fan, for low-tech reason.
If the fins of the rotor have a little bigger size, the required blow could
even be reached without transmission to change the rotation number/second.
Even that could be made simply by two disks and a rope. 
-Possibly my former low tech-proposal, the MALOT-rotor, could be used in
that sense. -The bow-driven stone-age-version (bi-directional) is not
necessary in that case.
- If there is only (main-)need for forced air in the beginning of the burn
-as by normally natural draft T-LUD is desired (-if I interprete Paul
Anderson's meaning right?) A short time hand-cranking will be done by most.
Who does not want the fire to start quickly and with less smoke?
-And a "coup de chaleur" like some cooks want to have, is easily to manage
as well by this procedure.
Smile and try and let us all know!
Regards

Martin

> Message: 1
> Date: Fri, 22 Feb 2008 19:45:29 +0530
> From: Ruban K <ruban1973 at hotmail.com>
> Subject: Re: [Stoves] Experiences Using a Hand Crank Generator for Fan
> 	Stoves
> To: Discussion of biomass cooking stoves <stoves at listserv.repp.org>
> Message-ID: <BAY128-W43A1FF9A1715B281EE224A91D0 at phx.gbl>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> While evaluating this option there are three things to be kept in mind:
> 
> 1. Cost
> 2. Manual work that the consumer is willing to put in
> 3. Technical feasibility.
> 
> I have developed stoves (equivalent of TLUD but slightly different) with a
> hand cranked generator and battery combination. [used for both 6V and 12 V
> fans], so technically the option works in terms that you can get a battery
> charged manually for operating the fans at constant speed for up to 45
> minutes.
> 
> Point 1 and 2 however are unfortunately currently working in the opposite
> direction. Consumers will not be willing to spend more than 5 minutes for
> cranking for each meal, this is only possible with a very high gearing
> ratio for the dynamometer and that gearing ratio means a lot of cost.
> [gearing ratios can be created with a lot of contraptions e.g. charging
> while riding a bicycle etc but these are not consumer friendly.
> 
> For the available dynamometers (e.g. the Philips hand charged radio) the
> time required for charging Vs time that the fan runs at constant speed is
> 1:1.15 which is not good enough for the consumers.
> 
> Coming to other forms of storing energy e.g. mechanical coils etc as in
> toys unfortunately for getting the constant speed operation for a cooking
> duration of over 45 minutes requires a huge contraption which I did make
> but is not useful for consumer scale operations at the right cost (plus
> the stove looks formidable)
> 
> will look forward to inputs from others.
> 
> 
> 
> > From: list at sylva.icuklive.co.uk> To: stoves at listserv.repp.org> Date:
> Sun, 20 Jan 2008 22:40:43 +0000> Subject: Re: [Stoves] Experiences Using a
> Hand Crank Generator for Fan Stoves> > On Sat, 19 Jan 2008 10:11:06 -0800,
> Charlie Sellers wrote:> > >See:
> http://www.bioenergylists.org/en/sellershandcrankpower > > I decided to
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