A question for the REAL experts here...

ndicki

ndicki

Charter Member 2016
Most sources say that the Glenn Martin 167F, in other words the French version of the XA-22 which subsequently became the Martin Maryland, was fitted with Wright R-1820 Cyclones rather than the Pratt and Whitney R-1830 Twin Wasps which were used on the demonstrators and on the later British aircraft... And yet I'm not convinced, if only because the engine cowlings remained unchanged. Other aircraft which switched from one to the other - the Hawk-75 comes to mind - had different cowlings for each engine.

And then I found this, which shows a French 167F during the Battle for France. That engine looks to me like a PW R-1830.

Martin_167F.jpg



Below, an R-1820 Cyclone:
cyclone-8a.jpg


And an R-1830 Twin Wasp:

A19750478000cp04.jpg


If you look at the way the ignition circuit hides the bolts on the one but not on the other, you'll see what I mean.

Can anybody advise on this?
 
The R-1830 is a 14 cylinder twin row, and the R-1820 is a 9 cylinder single row. It certainly looks like a twin row radial in those, so I my money is on the R-1830.
 
Everything I have lists the R-1830-SC3G Twin wasp of 1,050 HP. This for the French and the 75 Maryland Mk Is that went to the RAF.
 
Thanks! Looks like that's it then.

I wonder why so many sites mention Cyclones though... Urban legend?

Wikipedia:

"The prototype Model 167W was powered by twin-row Pratt & Whitney R-1830-37 Twin Wasp engines, which were replaced in French production aircraft by single-row 9-cylinder Wright R-1820 Cyclone engines (the Twin Wasps were then restored for the British Maryland)"
 
Why the hell are you working on such an obscure aircraft? :dizzy:

the best source seems to be the pdf book "Monografie Lotnicze 96 Martin 167 Maryland" though it looks to be writen in Polish. The engine and gun names still pop out at you though.
 
sdsbolt said:
Why the hell are you working on such an obscure aircraft? :dizzy:
Click to expand...

Some odd bloke sent me one because he didn't know what else to do with it... Can't think why!

Good book, although Polish has a lot of unexpected consonants in it. They must be frighteningly good at Scrabble.
 
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