Talk:General Electric/Rolls-Royce F136

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[edit] Lockheed LiftFan?

It is important to note that the lift fan system used in the GE / Rolls-Royce powerplants was developed exclusively by Lockheed Martin and not by either of the engine manufacturers.

Everything I read (even at jsf.mil) says RR developed the Lift Fan. AAK 14:58, 9 August 2006 (UTC)

Correct, the lift fan is Rolls-Royce developed and is marketed under a R-R trademark 'LiftFan', very inventive. Trent 900 21:31, 4 January 2007 (UTC)

The concept of the lift fan system was indeed that of an engineer at Lockheed Martin - the original idea was Lockheed Martins and they showed it could be done. It was, however, entirely designed, developed and manufactured by Rolls Royce. —Preceding unsigned comment added by 86.132.241.232 (talk • contribs) 23:41, 8 April 2007

The idea of using a separate engine where the liftfan is was seen on the Yakovlev Yak-141. LM had the idea to use the main engine to power it. Whether the first concept of a driven fan was LM or Russian or other isn't known but I know of no evidence to show it was ever taken seriously before LM. 80.42.153.107 (talk) 19:08, 26 December 2007 (UTC)

[edit] F135 vs. F136

What is the advantage of the F136 over the F135? I didn't see anything in the article stating this. The top thrust is the same. Axeman —Preceding signed but undated comment was added at 18:12, 30 September 2007 (UTC)

Axeman- I'd argue that there isn't an advantage, but a disadvantage. The government/Lockheed mostly wanted to have a few possibilities to choose from, so that it would produce a better and/or cheaper product. The last I heard (not posting this on the article because it's heresay and largely biased), the F-136 was a year behind schedule and 25% over weight. I don't have the sources to back it up, but I know that two congressmen line-edited the GE contract back INTO the defense budget a few years in a row, even after it had become obvious that they were floundering. 137.99.65.227 (talk) 18:05, 26 December 2007 (UTC)

Basically the two arguments are:

- (PRO) Competition produces better products at lower prices.
- (CON) Competition increases complexity and eats research budgets. 80.42.153.107 (talk) 19:08, 26 December 2007 (UTC)

I don't believe that the F136 is a year late. It just went through its Critical Design Review on time and on budget according to the jsf.mil and GE websites. Also, when you look at whether the engine is overweight or not, remember that Lockheed is looking at the propulsion system which includes the overweight liftsystem, not just the engine. Mave100 (talk) 11:17, 2 March 2008 (UTC)