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#1
10-10-18, 00:02
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Meanwhile, back to the thread. Here's the helicopter version of the engine, as talked about earlier. Continental R-975-46A being field changed in RCN HUP-3 "946" in the High Arctic. Summer 1955 transit of northern waters from BC to the Maritimes. Flew off #50 Labrador as part of proving trials to see if helicopters could be deployed on smaller sized ships. This lead to the invention of the the "Bear Trap" and successful deployment of the Sea King helicopters on RCN destroyers. Larry Zibitnew RCN Archives. (Go Navy)...grin...
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#2
10-10-18, 00:04
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Oops...obviously 246..
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#3
10-10-18, 04:05
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975-46
Great pictures Dennis!
can you imagine having to change an engine with equipment shown... lots of fun! Just like winter camping. I believe one of these helicopters resides in an aviation museum near Ottawa. Tims comments always welcome!
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#4
10-10-18, 12:17
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I wonder where they got the very long ladder from ? Too long to be needed locally or on the ship and even to transport easily. Very nice set of photos though Dennis.
David
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#5
11-10-18, 01:21
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975-46
Not only great pics but when you look closely...
in photos 2&3 you can see that an engine cooling shroud ( just like a tank engine) has been removed from the original engine and fitted onto the replacement in the can. This makes sense in this application where there is no propeller slipostream to cool the engine. Perhaps with a clutch assembly it could run a vehicle?? Also, in the background the original engine is stripped of its exhaust and mounts which will be refitted to the replacement. Good point about the ladder in a land with no trees!
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#6
11-10-18, 02:36
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Just curious, was the engine installed with the crank in the normal horizontal orientation? Those photos give me the impression it might have been installed with the crank vertical, which would make me curious about oil scavenging and carb type.
Malcolm
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#7
11-10-18, 02:47
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Bob and David. Here's 246 airborne with 245...Two of only three RCN HUP-3's that Canada bought in the Spring of 1954. Piasecki only built 30 of the HUP-3's. So a pretty rare version. Note only 246 carries Labrador's sort of...kind of ..SeaHorse crest. It would seem from these photo's, that the R-975's were not that reliable. Not exactly sure when or where these photo's were taken. But can only have been a month or two into the voyage. BTW..Good notes about the cooling fan being charged over. The cooling fan has direct implications for AFV installations.
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#8
12-10-18, 02:45
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975-46
A couple of quick points about the helicopter - engine application.
In researching the helicopters two interesting ideas showed up. First, one source claims that the reason the -46 engine was used was because the US military had a surplus of these available. I am not sure what other significant application rthere was for -46 engines in the 1950s, though radial engines were used in other versions of helicopters. There was also comments about -46 engines having problems, but little clarification as to what the problems may have been. While I am not a radial engine expert my inclination is to believe that radial engines ( like many aero engines) are high maintenance machines. I have heard many anecdotal stories about engine failure in this type of engine ( oil leaks, blown out spark plugs etc etc, but not just Continetal Wright) can anyone add more information about reliability, or problems not associated with ground machine applications?
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#9
30-01-20, 20:13
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HUP - but not of the CMP variant
Quote:
(I can post this here - a HUP is a HUP, eh?  )79371912_1014684562202085_541257787301167104_n.jpg Because of the drive-by nature of my own photo I added some more NMPs for clarity. 80325075_1014684612202080_3401083665675976704_n.jpg 79425522_1014753502195191_6632405540636983296_n.jpg
__________________
Regards, Hanno --------------------------
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