McDonnell-Douglas Model 18H compound power fighter

[Mark Nankivil]

Good Day All -

Found this general arrangement of McDonnell Aircraft's Model 18-H Tandem Engine Fighter in a collection I am scanning.

 

[Mark Nankivil]

...and a inboard profile....

Enjoy the Day! Mark

 

[Antonio]

Mark

...and a inboard profile....

Mark, you posted the same drawing again...

 

[Mark Nankivil]

Sorry about that - corrected! Mark

 

[GTX]

Interesting.

 

[hesham]

Amazing,thank you my dear Mark.

 

[famvburg]

Kind of a radial engined XP-81.

 

[bercr]

Great find, thank you Mark!

 

[lark]

Very well done Marc !

Fireball competitor ?

 

[Grey Havoc]

https://aviationarchives.blogspot.com/2022/04/mcdonnell-aircraft-model-18h.html

 

[overscan (PaulMM)]

Credit: Mark Nankivil

These are the same drawings posted here by Mark, with the addition of an I-40 engine drawing,

 

[Nicknick]

Guess it was inteded to use AVGAS, but can this be used in turbines without too many forming deposits?

Did a short research for the B-36:
https://www.quora.com/On-the-Convair-B36-did-the-piston-engines-use-the-same-fuel-as-the-jet-engines
So, it seams, it's kinda worked with AVGAS, but deposits were in fact a problem

 

[Scott Kenny]

Guess it was inteded to use AVGAS, but can this be used in turbines without too many forming deposits?

Did a short research for the B-36:
https://www.quora.com/On-the-Convair-B36-did-the-piston-engines-use-the-same-fuel-as-the-jet-engines
So, it seams, it's kinda worked with AVGAS, but deposits were in fact a problem

My A&P school ran our J34s on MoGas (automobile fuel), we had sulfur buildups on the turbine blades.

 

[Nicknick]

With todays MoGas this would surly no longer be the case, it is more likely that Jet-A would clog the catalyst of a modern Diesel engine instead....

 

[Scott Kenny]

With todays MoGas this would surly no longer be the case, it is more likely that Jet-A would clog the catalyst of a modern Diesel engine instead....

Probably. I was doing my A&P training over 25 years ago... (expletives deleted) I feel old now, thanks for that...

 

[Nicknick]

sorry for that, I know how it feels

 

[Pioneer]

Very interesting thank you Mark!!

Regards
Pioneer