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The Engines Of The Spruce Goose  
User currently offlineFlagshipAZ From United States of America, joined Jan 2001, 3419 posts, RR: 14
Posted (11 years 7 months 1 week 3 days 20 hours ago) and read 16591 times:

Hi folks...
I remember hearing rumors that the 8 round motors of the HK-1 Hercules being fired up once a year while the bird was still in long-term storage at LGB harbor. Any truth to this rumor, or is it just urban legend? Also, does anyone here know what brand & model piston engines are installed on the Goose? How is this aircraft doing in Oregon nowadays...all reassembled again? All replies appreciated. Regards.


"Beer is living proof that God loves us and wants us to be happy." --Ben Franklin
11 replies: All unread, jump to last
 
User currently offlineIMissPiedmont From United States of America, joined May 2001, 6295 posts, RR: 33
Reply 1, posted (11 years 7 months 1 week 3 days 18 hours ago) and read 16581 times:

The engines are the P&W 4360 as on the B-50, C-124, B-36. C-97/B-377. etc.

It is not true that were started yearly.

The aircraft if fully assermbled and on display in Oregon.



Damn, this website is getting worse daily.
User currently offlineErj-145mech From United States of America, joined exactly 13 years ago today! , 306 posts, RR: 1
Reply 2, posted (11 years 7 months 1 week 3 days 16 hours ago) and read 16544 times:

Originally, Hughes wanted to use Lycoming XR-7755's, but Lyc couldn't get the bugs worked out in time. The original plan was to use four of the Lycomings, and it took 8 of the Pratts to come up with the right amount of power.

The 7755's were 36 cylinder corncobb behemoths, the rear two rows had water jackets and were water cooled. Not enough cooling air could get back there. When the engines were powered up in the test cells in Montoursville, where the plant is located, the resulting vibrations would knock china from hutch shelves. Lycoming engineers built a special test cell that used a series of criss crossing railroad ties to try to reduce the vibrations. I saw one when I was at the Lycoming factory in the late 70's, and talked with one of the engineers involved.


User currently offlineT prop From United States of America, joined Apr 2001, 1029 posts, RR: 1
Reply 3, posted (11 years 7 months 1 week 3 days 14 hours ago) and read 16537 times:

Here's the big Lycoming.





T prop.



User currently offlineBuzz From United States of America, joined Nov 1999, 697 posts, RR: 21
Reply 4, posted (11 years 7 months 1 week 3 days 8 hours ago) and read 16497 times:

Hi FlagshipAZ, Buzz here. If you come to Portland Oregon, it's about an hour's drive SW to McMinnville airport (MMV) which is across the street from the Evergreen Museum. You can see the "barn" from several miles away when you fly in the area.
Engines and a few other parts are quite out of reach, but the Hughes HK-1 is assembled and they have a nice musueum there.
For more large engine stuff, try a web site www.enginehistory.org and see what the Aircraft Engine Historical Society has posted, it's interesting stuff.
g'day


User currently offlineBroke From United States of America, joined Apr 2002, 1322 posts, RR: 3
Reply 5, posted (11 years 7 months 1 week 3 days 6 hours ago) and read 16462 times:

The Air Force Museum at Dayton, Ohio has two displays that include the R-4360. One is the C-124, where one of the airplane's engines is uncowled. The cylinder heads are covered by sheet metal used to direct cooling air more efficiently over the cylinders. The last row of cylinders had a reputation of overheating more than any other row. This will give you a good idea of a typical engine installation.

The other exhibit is of a R-4360 mounted on a portable engine stand with the cylinder heads exposed. You can get a much closer look at the "corncob" and its accessory section which is mounted on the back of the engine.

In the big engine class, the museum also has a Wright R-3350 that has been partially cutaway so you can see the pistons, connecting rods, crankshaft, etc.


User currently offlineFlyf15 From , joined Dec 1969, posts, RR:
Reply 6, posted (11 years 7 months 1 week 3 days 3 hours ago) and read 16444 times:

What was the displacement and horsepower/torque of the 7755? That thing is enormus!

User currently offlineTomh From United States of America, joined May 1999, 960 posts, RR: 2
Reply 7, posted (11 years 7 months 1 week 2 days 22 hours ago) and read 16403 times:

According to Herschel Smith in "A History of Aircraft Piston Powerplants", the Lycoming XR7755 achieved 5,000 HP on test with a development goal of 7,000 HP. Smith alludes that there is one at Silver Hill.



User currently offlineIMissPiedmont From United States of America, joined May 2001, 6295 posts, RR: 33
Reply 8, posted (11 years 7 months 1 week 2 days 18 hours ago) and read 16366 times:

To add a bit to the post by Broke.

At the Pima Air Museum we have a 4360 cutaway that, when you press a button, turns. Quite impressive if you've never seen a radial in operation. I've watched people stand for an hour watching and trying to figure it out.

Visit us when in Tucson. Just walk on back to hanger 2 and see our small collection of engines. When was the last time you got to turn an RB-211 by hand and hear the wonderful clank?

ID the prop behind the desk and I will be eternally grateful, none of us can tell what aircraft it's from.



Damn, this website is getting worse daily.
User currently offlineFlagshipAZ From United States of America, joined Jan 2001, 3419 posts, RR: 14
Reply 9, posted (11 years 7 months 1 week 2 days 9 hours ago) and read 16342 times:

Thank you one & all, for your fantastic replies. I've heard that the R-4360 was also the main power plant on the original Flying Wing...the XB-35. Don't know if this is true or not. I'm certainly will be visiting the USAF Museum once again, and also the Pima Air Museum...have yet to visit that place. Thanks again, guys. Best regards.  Wink/being sarcastic


"Beer is living proof that God loves us and wants us to be happy." --Ben Franklin
User currently offline411A From United States of America, joined Nov 2001, 1826 posts, RR: 8
Reply 10, posted (11 years 7 months 1 week 2 days 3 hours ago) and read 16329 times:

For those that may be unaware, the Pratt&Whitney R-4360 (Wasp Major) was developed specifically for the B36 (pusher design) and when the engines were used on other aircraft, the rear row (row four) ran very hot because, the cylinder row offset was the "wrong way 'round" for a tractor design, thus cooling air was difficult to get to those rear cylinders.
For the military, not a problem, unlimited budgets were available.
Civil designs were limited to the Stratocruiser, which burned approximately 600 gals/hr (fuel) and 8 gals/hr (oil).
Somewhat like the DC7, range was often limited by oil quantity.


User currently offlineTimz From United States of America, joined Sep 1999, 6838 posts, RR: 7
Reply 11, posted (11 years 7 months 1 week 1 day 21 hours ago) and read 16436 times:

Gunston says the 7755 had 36 cylinders 6 3/8 by 6 3/4-- so that's 7756 cubic inches.

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