[WWI] rotaries--2 stroke or 4?

[Douglas Anderson]

Yes, the material should be free of copyrigt as it was published in about 1918, and there is no mention of copyright, only that this information may not be communicated to any person not holding an official position in His Majestty's Service. I don't think they will have us up for espiuonage regarding this material. I am scanning it and will produce it in pdf format, then send it to you

ot 811 list <ot811.wwi+list at gmail.com> wrote:  Douglas,
You can send the scans to me or Allan, and we will post them. This
will have to wait until Allan comes back from vacation, as he needs to agree
that there is no copyright issue here. Is the material free of copyright ?
regards
Sanjeev

On 3/20/07, Douglas Anderson wrote:
>
> This debate is about to be solved. And for those with a slightly
> engineering twist, petrol heads and those with an interest, your fantasies
> and desires are about to be fulfilled. Yes, I am back in Cape Town, which
> means that the RFC manual I will collect and scan and send to the group.
> Which reminds me, how do I go about posting a pdf that all may access and
> download
>
> Ray Boorman wrote: One of the early Gnome Rotary
> methods uses the vacuum in the cylinder
> to open a poppet valve in the piston, this then draws fuel both oil
> and gas from the crankcase into the head, then at the right point the
> valve closes because of the upstroke of the piston an hey presto you
> have a 2 stroke method used in a four stroke engine.
>
> The Monosoupape used transfer ports instead of the valve in the
> piston, this made for easier service. Later the LeRhone used a single
> pushrod to operate two valves in the head one the intake the other the
> exhaust. Although even in this engine the main intake comes through
> the crankcase which is why you see the intake tubes go from the
> crankcase to the cylinder head.
>
> All of these used methods that were the same as two strokes used, but
> were in fact four strokes. However there is no reason why a two cycle
> would not work.
>
> Crankcase compression used by modern two strokes didn't really get
> going in a scientific fashion until the racing DKW two strokes of the
> late 20's and 30's. In fact many methods were used to get better
> compression some even included using a compression cylinder that
> supplied gas to the working cylinders. Up until that time the
> crankcase was used more for the transfer of gas not compression,
> which is how most of the rotaries worked, albeit they were 4 strokes.
>
> Hope that helps.
>
> Ray
>
> On 3/11/07, Nigel Cheffers-Heard wrote:
> > Generally speaking, two strokes use crankcase pressure for transfer.
> > since the rotary has a common crankcase, and some of the pistons are
> > up, down, or in between, the volume remains relatively constant,
> > therefore no "suck and blow"| to make the process work.
> > The two stroke diesels you speak of, and indeed huge modern ship
> > engines, use superchargers or turbochargers to effect scavenging and
> > transfer without using crankcase pressure.
> > N
> >
> > Nigel Cheffers-Heard
> > su3264 at eclipse.co.uk
> > 0771 261 4514
> > Bridge Inn
> > Topsham
> > Exeter
> > EX3 0QQ
> >
> >
> > On 10 Mar 2007, at 0:46, iban wrote:
> >
> >
> > >
> > > seems to me (iirc) that at least dornier was working on 2-stroke
> > > diesel aero-engines (solved the total loss lube prob) from very
> > > early on. wonder if they tweaked an oberursel in their experiments
> > > perhaps?
> > >
> > > iban.
> > >
> >
> >
>
>
>
> ---------------------------------
> Finding fabulous fares is fun.
> Let Yahoo! FareChase search your favorite travel sites to find flight and
> hotel bargains.
>


 
---------------------------------
The fish are biting.
 Get more visitors on your site using Yahoo! Search Marketing.