Hello Ethan and Peter,
 
Thank you Peter for verifying that my conclusion about the basic propeller (diesel) and basic propeller probably should be TL 4 versus TL 5.
 
I agree with you Ethan that prop efficiency was changing over the period and that the attempts to replicate them for easy of game play does cause some issues.
 
Thank you both for the replies.
 
Tom Rux
Sent: Monday, June 03, 2019 11:01 AM
Subject: Re: [TML] MT: COACC Question Fixed-Wing and Airship Engines
 
Prop efficiency increases so much over the period that it breaks simple systems like this.
 
On Mon, Jun 3, 2019, 10:47 Peter Vernon (via tml list) <xxxxxx@simplelists.com> wrote:
The high speed Diesel is a twenties development, but low speed with a big prop was used on airships. So I would say either way tech 4. Late tech 4 for the high speed types but still tech 4.
 
Peter V.
 
 
On Monday, June 3, 2019, 7:57:21 AM MDT, xxxxxx@comcast.net <xxxxxx@comcast.net> wrote:
 
 
Morning from the Pacific Northwest,
 
On MT: COACC page 32 the Fixed-Wing Engine Table lists the Basic Propeller as being TL 4 while the Airship Engine Table page 44 lists the Basic Propeller (Diesel) and Basic Propeller as TL 5.
 
My recollection and quick review of my books on hand and on the internet indicate the airships of the time used both diesel and aircraft engines which at least in my opinion would put them both at TL 4.
 
Should the Airship Basic Propeller (Diesel) and Basic Propeller engines be TL 4 versus TL 5 or am I out-to-lunch again?
 
Tom Rux