Challenge: Beat Strega

Discussion in 'Hangar Flying' started by Tiger Tim, Sep 28, 2017.

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  1. Dec 2, 2017 #201

    rv6ejguy

    rv6ejguy

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    That's the basic plan but it won't be a crate engine and it will be turbocharged of course. We still need 850hp at 8000 feet DA to beat what's running now even if we can cut drag 10-15%. This will be built on the budget plan from private funds (ie one guy's checkbook).
     
  2. Dec 2, 2017 #202

    plncraze

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    850 hp is less than the Sledgehammer (over 200 mph) Corvette had. 850hp is probably about 200hp over stock normally aspir. with a mean cam. I know a low-budget drag racer at work and he throws nitrous at everything and never messes with the bottom end of a small block Chevy and it holds together. He has an ebay turbo now. That'll be interesting. If you can handle the heat that plane will be a heck of a ride. The Pereira GP-5 started from this idea sort-of. I think they got bit by the reduction drive.
     
  3. Dec 2, 2017 #203

    Topaz

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    What's your baseline for that comparison? Which aircraft?
     
  4. Dec 2, 2017 #204

    Hot Wings

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    But is that going to do any good? Even if we cut the drag n half and use a lighter engine/airframe with more power are we going to be able to get that power to do any work. Seems like the limiting factor is getting a prop(s) to work more efficiently at near mach numbers?
     
  5. Dec 2, 2017 #205

    rv6ejguy

    rv6ejguy

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    With Reno around 8000 feet DA, you lose an easy 20% of the SL power rating. Nitrous is ok for a short burst but you need a lot for 8 minutes. The GP-5 was the right idea with not enough power (no turbo) to get the job done. They got the drive problems handled in the end with EPI.
     
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  6. Dec 2, 2017 #206

    rv6ejguy

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    Lancair Legacy and Glassair are at the front currently. Both side by side seating.
     
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  7. Dec 2, 2017 #207

    rv6ejguy

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    The TU-95 does ok but it has massive hp. I think the props only turn at 750 rpm there. The race Merlins have pretty low gearbox ratios as well.

    In Sport Class, all the fast folks have custom props.
     
  8. Dec 2, 2017 #208

    BoKu

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    Nothing wrong with the GP-5 that some carbon fiber wouldn't fix.
     
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  9. Dec 2, 2017 #209

    BoKu

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    Nothing wrong with the GP-5 that some carbon fiber wouldn't fix.
     
  10. Dec 2, 2017 #210

    Victor Bravo

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    Speaking of 75 year old warbirds with big engines on them, a very dear friend of mine is the lead design and structures engineer on a full scale exact replica of the famous Napier Heston racer in Australia. If I had not mentioned this before, the aircraft will be as close of a replica as possible with the very tiny amount of information that is available on that design. They will use another engine (a Merlin or Griffon perhaps), because the original Napier Sabre engine used in the Heston racer was smaller than the later production Sabres used in the Typhoon and Tempest. It will not fit in the cowling of a "correct" Heston.

    Even this... a big engine on an airframe smaller and lighter than the WW2 fighters... will not be fast enough to "beat Strega", according to the calculations.

    But it will be the most incredible sight to behold !
     
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  11. Dec 2, 2017 #211

    plncraze

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    How far along is the Heston project? Pictures please!
     
  12. Dec 2, 2017 #212

    rv6ejguy

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    Interestingly, I sent photos to my friend of the GP-5 and the Napier Heston for additional ideas! Both a favs of mine. Will be very cool to an NH replica fly.
     
  13. Dec 2, 2017 #213

    RJW

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    Yeah it’s very cool.

    Since it’s a racer to be used for just a few minutes maybe prone wouldn’t be too bad. A good chin rest and a helmet lanyard like the circle track guys wear (one that wouldn’t kill you in a bumpy landing) might help?

    Another thing; a similar plane with high wings might be better for drag and also egress in an emergency. If the plane were flyable but not landable then zoom, open the bomb bay doors, and dump the load (pilot).

    Dang! I feel another drawing coming on!:)[​IMG]

    Rob
     
  14. Dec 2, 2017 #214

    bmcj

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    Prone is a pain, but you might overcome some of that limitation with a set of VR goggles that reorients the view so that the pilot doesn’t have to crane his neck.

    which leads to YE next question... How did Superman fly comfortably without VR goggles?
     
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  15. Dec 2, 2017 #215

    Topaz

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    Absolutely! And that's the next area for major development after better aerodynamics for the airframe, itself the next step after putting a modern engine in these things. Progressively harder challenges, each wringing more and more performance at the price of more development work.

    Modern engines are the "low hanging fruit", and they seem to be a relatively well-understood development process if I'm understanding rv63guy correctly.

    Modern low-drag airframe aerodynamics are well understood in sailplane applications, less so in the kind of flying done at Reno, so some development and research is going to be necessary to get a really big benefit, just as sailplanes went through the process in the '60's-'80's.

    A truly transonic or supersonic propeller is a gigantic undertaking in terms of development. There's no eyeball engineering that applies, and build-test-iterate would take so long as to be an entire waste of time and funding. There are virtually no real-world examples from which to take pointers to guide development (Thunderscreech?), and all the really relevant recent research work (UDF research by Rolls, Pratt, and GE) is all proprietary and unavailable. You'd be starting almost from scratch. Got a supercomputer and some transonic or supersonic wind-tunnel time available?

    Someday, somehow, racers will hopefully be flying in some class with thoroughly modern powerplants, extremely low-drag transonic airframes, and fully-supersonic propellers, pushing the sound barrier as they run the long, previously jet-only course.

    That''ll be something to see and hear!
     
  16. Dec 3, 2017 #216

    Tiger Tim

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    R-3350 powered Monster Mulligan?
     
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  17. Dec 3, 2017 #217

    TFF

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    What's the holdup of the guy who built the replica MB5? A friend told me it has not been flown yet even though it was taxied in 2006. Its in Reno; it should be all over the races.
     
  18. Dec 3, 2017 #218

    mcrae0104

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    Finally, a useful purpose for jetpacks: pylon judge, floating at 50 feet above the pylon.

    On second thought...
     
  19. Dec 3, 2017 #219

    Hot Wings

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    [video=youtube;JLCM8osCT-M]https://www.youtube.com/watch?v=JLCM8osCT-M[/video]
     
    Last edited by a moderator: Mar 20, 2019
  20. Dec 3, 2017 #220

    Toobuilder

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    The Heston is a neat looking racer and the MB 5 clearly is an evolution of the best the 40's had to offer, but we have learned an awful lot about aerodynamics since then. Lets not forget that the MB 5 was designed as a combat aircraft - plenty of compromises there that are in conflict with the "mission" of a pylon racer.

    I think we need an AR-5 with a 1500 HP LS V8 on the nose!
     

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