Grisee08
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I have some questions about the BR700 engines

Fri Dec 29, 2017 9:17 pm

As it currently stands, the BR715 is the only engine in the BR700 series of engines that is used commercially, and that is the Boeing 717. The BR710 is on the Gulfstream V and 550, and the BR725 is on the Gulfstream 650.

Is the BR700, which is a fairly new engine (compared to the JT8D and V2500) already obsolete due to GTF? Does anyone think it will ever be used to re-engine any aircraft, or be used on new developments, or is the BR700 essentially dead except for support?

I would like to know more about it's current status. It's a good engine for its class, I believe.
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Re: I have some questions about the BR700 engines

Fri Dec 29, 2017 9:22 pm

Interestingly enough, our thread in mil-av suggests BR725 is a contender to be offered on the B-52 bomber re-engine competition.

I don't think GTF makes it obsolete, yet.

I've read here on a.net that BR715 blades need to be replaced earlier than planned so cost and time on the wing is a bit of a pain to deal with.
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Grisee08
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Re: I have some questions about the BR700 engines

Fri Dec 29, 2017 9:52 pm

I would love to see the BR725 on the B-52. Would the BR715 be too much oomph for them? The 725 has 16,100 while the 715 has 18.5-21k. The BR710-B3-40 with 16,000lbf would have been a great replacement of the JT8Ds on the DC-9s for Delta/Northwest. or even a BR715-A1-30 with 18.5k pounds (little more pep in its step)
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holzmann
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Re: I have some questions about the BR700 engines

Sat Dec 30, 2017 1:01 am

To what extent was BMW involved in the R&D of this engine?
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AA737-823
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Re: I have some questions about the BR700 engines

Sat Dec 30, 2017 1:52 am

holzmann wrote:
To what extent was BMW involved in the R&D of this engine?


To my knowledge, none at all.
They simply inherited the project due to a takeover of that department of Rolls Royce.
But I don't think there was any involvement other than that.
 
WIederling
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Re: I have some questions about the BR700 engines

Sat Dec 30, 2017 6:21 pm

AA737-823 wrote:
holzmann wrote:
To what extent was BMW involved in the R&D of this engine?


To my knowledge, none at all.
They simply inherited the project due to a takeover of that department of Rolls Royce.
But I don't think there was any involvement other than that.


https://en.wikipedia.org/wiki/Rolls-Royce_BR700
It was developed by BMW and Rolls-Royce plc through the joint venture BMW Rolls-Royce AeroEngines GmbH, established in 1990.
The BR710 first ran in 1995.[1] It is manufactured in Dahlewitz, Germany.
Rolls-Royce took full control of the company in 2000, which is now known as Rolls-Royce Deutschland.

Now 100 % RR ownership but still a distinct subsidiary of RR:
https://en.wikipedia.org/wiki/Rolls-Roy ... eutschland
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WPvsMW
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Re: I have some questions about the BR700 engines

Sun Dec 31, 2017 7:52 pm

The BR715 and thermal magic. Can anyone explain why the BR715 cools faster? (HA: short segments, AND short turns at terminals)
None of the pilots or techs at HA I've spoken with have a clue... but then they aren't B.S.M.E.s, thermal focus.
 
GalaxyFlyer
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Re: I have some questions about the BR700 engines

Sun Dec 31, 2017 8:26 pm

It doesn’t cool faster. In fact, between 20 minutes and 5 hours after shutdown, it has to be dry motored to even out temps and reduce rotor bowing. This is another a.net myth.

GF
 
WPvsMW
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Re: I have some questions about the BR700 engines

Mon Jan 01, 2018 8:44 am

GF, I'll rephrase my question... what makes the BR715 work for 12 to 17 turns a day in Hawaii, compared to the engines on Airbus, non-B717 Boeing, and other turbofan a/c?
 
GalaxyFlyer
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Re: I have some questions about the BR700 engines

Mon Jan 01, 2018 3:29 pm

Can’t say, but it isn’t thermal magic. I suspect it is that the 717 just works economically for HA, not the engine. The Shuttle planes of various types fly loads of daily flights, too. Even the domestic 747 in Japan.

GF
 
WPvsMW
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Re: I have some questions about the BR700 engines

Mon Jan 01, 2018 6:55 pm

But no other network has the short segments and 12 to 17 turns/day as HA's interisland network in Hawaii, and the only "modern" (if out of production) a/c that can do it without excessive maintenance is the B712.
 
GalaxyFlyer
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Re: I have some questions about the BR700 engines

Mon Jan 01, 2018 7:45 pm

I’d be surprised if that’s true. What excessive maintenance? Who’s tried with IAE or CFM engines?

Before I believed that it can’t be done with “modern” engines, I’d have see an engine manufacturer’s engineering showing the engine couldn’t take high daily cycles and why?

GF
 
WPvsMW
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Re: I have some questions about the BR700 engines

Mon Jan 01, 2018 9:55 pm

viewtopic.php?t=770237

viewtopic.php?t=283853

viewtopic.php?f=5&t=764343&p=11032113&hilit=The+CFM56+%26+Hawaii+Interisland+Flights#p11032113

Something in the design of the hot core of the BR715 allows it to cool adequately in the short time in cruise interisland. One theory was (or is) that low bypass turbofans (e.g., JT8D engines on the 732) cool adequately in short cruise times ... but the BR715 is high bypass.

Quiz time: what do the engines in the F-35B and the planned next gen of the BR700 series have in common?

A: blisks

https://en.wikipedia.org/wiki/Blisk

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