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1/5th Scale Merlin XX engine.... :: Archived
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JG300-Ascout
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PostPosted: Fri Sep 19, 2008 7:08 am
Post subject: 1/5th Scale Merlin XX engine....

Yes, it runs. See video at bottom.

The entire "engine history" site is great. Pistons, turboprops, jets...you can get lost in here for hours....

www.enginehistory.org/merlin_xx.htm

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Shadow_Bshwackr
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Location: Central Illinois, USA
PostPosted: Fri Sep 19, 2008 8:28 am
Post subject: Re: 1/5th Scale Merlin XX engine....

WHOA!!!! That IS cool! I like that sort of thing anyway being a 'gearhead' and all... Wink

Thanks for the link!!
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IMS_Dakota
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PostPosted: Fri Sep 19, 2008 5:52 pm
Post subject: Re: 1/5th Scale Merlin XX engine....

Here's another one that's been around for a while.
dynamotive.netfirms.co.../index.htm
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Shadow_Bshwackr
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PostPosted: Sun Sep 21, 2008 4:34 am
Post subject: Re: 1/5th Scale Merlin XX engine....

Thanks Dakota! Another great article!

Here's a quote from that page...

- Quarter Scale Merlin
SUPERCHARGER: WORTH IT?

There are two reasons why high-performance aircraft engines like the Merlin have superchargers. One, of course, is to increase power, particularly at high altitude. The other is to improve mixture distribution, which is always a problem for inline engines fed by a single carburetor. Even a slight pressure increase seems to help even out mixture distribution among the cylinders, but much of the improvement is simply due to the supercharger's agitation of the fuel/air mixture. These factors should work equally well on the Quarter-Scale Merlin, but the downside of adding the supercharger is complication and extra weight. The wheelcase/supercharger section is almost as complicated as the rest of the engine, and some of the castings are fairly challenging to work with.

The supercharger designed for the Quarter-Scale Merlin is based on the early Merlin's single-stage version. After consulting with supercharger experts, it was decided to gear the impeller to run at approximately 10 times crankshaft speed, or 36,000 rpm at the target 3,600 rpm engine speed . Calculations indicate that this will provide a small but significant pressure boost, sufficient for the target horsepower/rpm goal. Of course, boost pressure would be considerably higher if the impeller were geared to the maximum possible rpm for its size. Based on the general rule for centrifugal superchargers, that the impeller tip speed should not exceed roughly the speed of sound, this would be on the order of 160,000 rpm. Since the supercharger design is completely untested, even gearing it at 10:1 seems risky enough.


Ahhh...turbo and superchargers... Gotta like 'em...lol
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