Beyond The Sprues

Modelling => Ideas & Inspiration => Engineering Dept. => : Rickshaw October 28, 2014, 02:44:19 PM

: Looking for a Turbofan engine for a backstory
: Rickshaw October 28, 2014, 02:44:19 PM
I'm looking for a turbofan engine for a backstory.

I need it to be in about the 15-20,000lb thrust class (reheat).  Preferably non-American if at all possible, for political reasons.   It doesn't have to reached production stage but preferably it would have a diameter of about 1,200 mm.

Any suggestions?

: Re: Looking for a Turbofan engine for a backstory
: GTX_Admin October 28, 2014, 03:31:24 PM
Timeframe for scenario?
: Re: Looking for a Turbofan engine for a backstory
: elmayerle October 28, 2014, 08:17:53 PM
Agreed, timeframe is the critical factor, here.  Just to be certain I understand, that's 15-20,000 lb. thrust in reheat or that thrust dry and capable of reheat (use of reheat does limit you on bypass ratio)?
: Re: Looking for a Turbofan engine for a backstory
: kitnut617 October 28, 2014, 09:25:25 PM
RR Olympus 301 was a 20,000 lb dry thrust engine, not sure of it's diameter but the Olympus 101 was 1000mm
: Re: Looking for a Turbofan engine for a backstory
: Weaver October 28, 2014, 09:33:58 PM
The Olympus was a turbojet though, not a turbofan. The Rolls Royce Conway might fit the bill: 17,500 lb dry and 960mm diameter. They never built an afterburning one, but it must have been studied because  the engine was offered for the P.1121 and TSR.2. Hard to imagine an afterburner that wouldn't get you your 20,000lb and then some.....
: Re: Looking for a Turbofan engine for a backstory
: Rickshaw October 28, 2014, 10:14:10 PM
Sorry for being imprecise.   I mean max. thrust with reheat in the 15-20,000lb range.

Timeframe?  1990s.  Can be an older engine from the US (in otherwords our international pariah state could pick them up off the scrap heap)...

While a turbojet would work, I'd prefer a turbofan for better fuel economy, as it will be going into a strike aircraft.
: Re: Looking for a Turbofan engine for a backstory
: Weaver October 29, 2014, 12:23:53 AM
If it's a pariah state, then a Chinese-built WS-9 (Spey 202) makes sense. 20,500lb with reheat and 1092mm diameter.

Alternative: Klimov RD-33. 18,285lb with reheat and 1000mm diameter.
: Re: Looking for a Turbofan engine for a backstory
: kitnut617 October 29, 2014, 01:28:53 AM
The Olympus was a turbojet though, not a turbofan.

RR Spey then --- just over 20,000 slb in afterburner
: Re: Looking for a Turbofan engine for a backstory
: elmayerle October 29, 2014, 01:31:08 AM
Would this be a full-up military engine with reheat already in place or would this state be in a position to add reheat to a commercial, or dry military, engine?
: Re: Looking for a Turbofan engine for a backstory
: Rickshaw October 29, 2014, 09:20:55 AM
Would this be a full-up military engine with reheat already in place or would this state be in a position to add reheat to a commercial, or dry military, engine?

It has the technical means and ability to add reheat and a commercial engine might be easier to obtain than a military one.   Commercial engines are in the mix as well.   However, it has to be a "slim" one, to fit inside a military airframe, rather than hang off the wing.
: Re: Looking for a Turbofan engine for a backstory
: elmayerle October 29, 2014, 11:06:37 AM
How about buying a bunch of early 727's and 737's with the slim JT8D's (before the by-pass ratio went up in the -100 and -200 series JT8Ds); they have the right by-pass ratio and SAAB proved they can make a good reheated engine (as in the Viggen's RM8 which is an afterburning early-model JT8D).  If memory serves me correctly, they are about the right diameter, too.  The same thing could be done by purchasing a bunch of used BAC 111's for the Speys on them and then adding an indigenously-developed reheat installation.

Note: First-generation JT8D's have a diameter of roughly 1030 mm, even in the reheat-equipped RM8 for the Viggen.  Considering that the turbojet version of this core is in military service as the J52 and a reheated version of that was proposed as the PW1216 with 16000 lbt in reheat, I think it would fit your scenario.
: Re: Looking for a Turbofan engine for a backstory
: Rickshaw October 30, 2014, 01:21:12 PM
elmayerle, thanks for the suggestions.   I'll have a think about them but they offer some good fodder for thought.
: Re: Looking for a Turbofan engine for a backstory
: M.A.D November 12, 2017, 07:04:08 PM
Rickshaw, how did you end up going with this engine selection? Was there a backstory to this?

M.A.D
: Re: Looking for a Turbofan engine for a backstory
: Rickshaw November 16, 2017, 09:29:13 AM
Rickshaw, how did you end up going with this engine selection? Was there a backstory to this?

M.A.D

It has not progressed beyond a What-if idea.  Sorry.
: Re: Looking for a Turbofan engine for a backstory
: M.A.D January 23, 2018, 01:15:59 PM
 :(

Still very inquisitive........ :P

M.A.D