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A few weeks ago I posted the following inquiry:
My Dad has an old all wood prop he would like to have help identifying. He's had this for at least 50 years. Even then it was old. He guesses that it is from the 1920s, & is probably from the USA. It has 8 bolt holes, is 98 1/2" long, 5 5/8" thick at the center. It is comprised of 7 pieces of wood laminated together. Some numbers/markings on it as far as he can tell include: DG70D112 100 HP Mono P20. Thanks for your help!
Bob Gardner replied:
Hello Charles,
Welcome to our forum.
Your Dad's prop dates from about 1915 in the first World War.
It was built to a design of the Integral Propeller Co. The drg no in full reads IPC 70. It was also made, probably, by the British Integral Propeller Co although other people also made the prop under sub-contract.
The diameter of your prop is 2500 mm and the phrase 100hp Mono refers to the French 100hp Gnome Monosoupape rotary engine. Monosoupape translates as one-valve.
This prop was fitted to the de Havilland DH2, a pusher aircraft which helped eliminate the Fokker scourge of 1915 where the German Fokker E III etc was initially able to shoot down every British aircraft at will.
Your Dad's prop is a valuable artefact from World War One and certainly something he should look after (which translates as preserving it as it is and not cleaning or revarnishing it).
Bob
I’ve returned with some amateur pictures of this prop. My Dad is interested in knowing its value.
Thanks,
Chuck
charlesamstutz@att.net
My Dad has an old all wood prop he would like to have help identifying. He's had this for at least 50 years. Even then it was old. He guesses that it is from the 1920s, & is probably from the USA. It has 8 bolt holes, is 98 1/2" long, 5 5/8" thick at the center. It is comprised of 7 pieces of wood laminated together. Some numbers/markings on it as far as he can tell include: DG70D112 100 HP Mono P20. Thanks for your help!
Bob Gardner replied:
Hello Charles,
Welcome to our forum.
Your Dad's prop dates from about 1915 in the first World War.
It was built to a design of the Integral Propeller Co. The drg no in full reads IPC 70. It was also made, probably, by the British Integral Propeller Co although other people also made the prop under sub-contract.
The diameter of your prop is 2500 mm and the phrase 100hp Mono refers to the French 100hp Gnome Monosoupape rotary engine. Monosoupape translates as one-valve.
This prop was fitted to the de Havilland DH2, a pusher aircraft which helped eliminate the Fokker scourge of 1915 where the German Fokker E III etc was initially able to shoot down every British aircraft at will.
Your Dad's prop is a valuable artefact from World War One and certainly something he should look after (which translates as preserving it as it is and not cleaning or revarnishing it).
Bob
I’ve returned with some amateur pictures of this prop. My Dad is interested in knowing its value.
Thanks,
Chuck
charlesamstutz@att.net
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