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**MikeW** · 03-11-2008, 10:14 AM

The airframe wasn't designed to take the pounding of approaching the sound barrier. The Stormbirds can go 500 mph, but they don't recomend going over.

Edit: You have been hearing wrong:
http://www.stormbirds.com/project/te...echnical_3.htm

The J-85 has more thrust than the Jumo and weights less.

**frank savage** · 03-11-2008, 10:29 AM

Hi mike, thanks for your reply!
I have not understand... I have been hearing wrong about what?

So, you say that the new 262 hasn't been 'castrated'? The performance are almost the same between both productions and the long run to take off only a my wrong thought?

Many thanks, frank

**Federico Perez** · 03-11-2008, 10:44 AM

Originally posted by frank savage View Post

Hi mike, thanks for your reply!
I have not understand... I have been hearing wrong about what?

So, you say that the new 262 hasn't been 'castrated'? The performance are almost the same between both productions and the long run to take off only a my wrong thought?

Many thanks, frank

This "replica ME-262" is even better than the original in powerplant and construction materials, taking in consideration the time frame and status of german industries at the time of the original ME 262 introduction to combat service!!!the engines are smaller than the original ones but the covers of the engines are the same diameter and scale as the original.

The long run you see in the take off for the replica plane is in part for security reasons of the airplane(a lot of$$$$$$$$$$$$$) and probably the airport or landing strip regulations, by the way, the original ME-262 take off and landings had to be "guarded" by FW-190 or ME-109 planes to avoid any surprise attacks by the allies fighters that by then had air superiority over most of Europe, also the less stress put on these early jet engines the better, their flight operation life was said to be 24-48 hours!!!

**MikeW** · 03-11-2008, 10:53 AM

New and Improved:
J-85 Each J-85 produces 2,850 lbs. of thrust, yet weighs only 395 lbs. In simpler terms, the new engines offer nearly twice the power for less a quarter of the Jumo's weight penalty.
The design dynamics of the Jumo engine castings are expected to reduce the thrust available by about 300 lbs. per engine. Our current engineering estimates call for an actual power output in the vicinity of 2400-2500 lbs. per engine.
Integration of the J-85 will bring many noticeable improvements. Takeoff distances will be significantly shortened (<2,000'), and time-to-climb rates vastly improved. Also, the J-85 responds well to varying power demands (including low power settings) and is highly tolerant of the kind of airflow disruptions that gave the Jumo such difficulty.

Old and Wartime:
JUMO In aircraft applications, engine power is characteristically measured in terms of thrust versus weight. The Jumo 004 was typical of early jet engines in that it was rather heavy, and not especially efficient.
Production model 004s produced 1,980 lbs. of thrust, and weighed in at about 1,800 lbs. Because of this, the engines were not extraordinarily effective at low airspeeds or altitudes or at reduced power settings.
Long takeoff rolls (>3,000') were evidence of this phenomenon and, once aloft, power management became critical. Abrupt throttle changes or rapid maneuvering often resulted in a flameout, or worse, a complete compressor failure.

Seems like the J-85 has more thrust and is superior

**frank savage** · 03-11-2008, 11:24 AM

Ok, mate!
Many thanks to mike and federeico for your kindness!!!

Frank

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'Castrated' Me262 ?

'Castrated' Me262 ?

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