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Old 05-14-2012, 05:57 PM   #1
Inky Engines
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Default Elmer's Grasshopper #37 Engine

As promised, I've put together a video of the latest Elmer Verburg engine from the Inky Engines stable. It joins the wobblers and beam engine, videos of which were attached to my recent Newbie posting.

Please excuse my attempt to show pressure on the gauges ..... an expensive computer, excellent eyesight and quick reactions on the pause are probably necessary to read the dials on the video .... for anybody interested at slow tickover the engine is running on 1.5 psi at 166 rpm whilst on 7.5 psi it runs at 722 rpm ... full scale deflection on the left hand gauge is 15 psi and that on the right 60 psi ... I bought the 15 psi gauge upon realising that with the Elmer's engines I was building the needle barely moved on the 60 psi gauge. The grasshopper will of course run faster, but this is not imho appropriate for a beam engine!







Now the grasshopper is consigned to the mantlepiece I will concentrate on completing Elmer's #33 Mill and #41 Factory Engines. I'm building these as a pair and may let them run together as a quasi twin cylinder slide valve set up ... not exactly realistic, but fun!

Kind regards

Geoff at Inky Engines


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Old 05-14-2012, 06:04 PM   #2
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Default Re: Elmer's Grasshopper #37 Engine

Well done, indeed. A beautiful model.

I must agree with you. Beam engines are not meant to be run fast. Stately and elegant, not frenetic, is the way to go.



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Old 05-14-2012, 06:05 PM   #3
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Default Re: Elmer's Grasshopper #37 Engine

Beautifully done Geoff!! It obviously runs well and the finish is superb!! Well done...already looking forward to your next ones

Bill

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Old 05-14-2012, 06:06 PM   #4
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Default Re: Elmer's Grasshopper #37 Engine

Looks great! Well done

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Old 05-14-2012, 06:34 PM   #5
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Default Re: Elmer's Grasshopper #37 Engine

Another great engine Geoff!!!!

Runes beautifully, especially at the slowest speed!!
Those engines look grand when they are able to just tick over!

Fit, finish and presentation are amazing!!

Congratulations!!

Andrew

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Old 05-14-2012, 06:54 PM   #6
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Default Re: Elmer's Grasshopper #37 Engine

First class. Should look real nice up there on the mantle.

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Old 05-14-2012, 07:41 PM   #7
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Default Re: Elmer's Grasshopper #37 Engine

Geoff,

Very well done. The video presentation is one of the best I've seen with the transitions from the plans, to the raw stock, machined parts, assembly and running of the engine. Very nicely done.

Bob

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Old 05-14-2012, 09:15 PM   #8
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Default Re: Elmer's Grasshopper #37 Engine

Beautiful execution. Great runner. The Grasshopper was my 2d engine and one of my favorite builds.
Very nice base.
Best
Stan

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Old 05-15-2012, 07:44 AM   #9
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Default Re: Elmer's Grasshopper #37 Engine

A very nice build of the Grasshopper indeed

I like your use of the nylock nuts on the pivot pins

Kind regards, Arnold

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Old 05-17-2012, 02:41 PM   #10
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Default Re: Elmer's Grasshopper #37 Engine

Gentlemen .....

Thank you for your encouraging comment ... it is very much appreciated. Noted in particular that both Stan and Arnold have built the same engine.

I’m pleased, but not surprised to hear that you take most pleasure from seeing beam engines such as this run slowly. Notwithstanding, it is perhaps necessary to run the models at both slow and high speeds to assure oneself of the quality of build ... I’ve had engines running well at slow speed, but presenting problems at high, and vica versa.

Arnold ....

... the Nylock nuts on pivot pins! I agonized over these for some time ... they are not exactly authentic. Elmer Verburg does however use a lot of these small pins secured by even smaller pins which are not only a pain to make, but moreover can be fiddly when dismantling and reassembling the engine .... hence my change of approach to M2 and M2.5 threaded pins and Nylock nuts ... I remanufactured such pins for Elmer’s Beam Engine #24 which is about half the size of the Grasshopper, and they look fine.

As an aside, I note that on your Tall Vertical Open Column build you dismiss use of cheese-head screws on the finished engine .... I think most would agree, no slotted screws (although Darren uses them on his very nice virtual engine!). Leads then to the question as to what fixing finds general favor? I have tended to use button head socket screws, more from habit than any logic. I’ve considered cap head socket screws, and noted that size for size they use a larger socket key than the button head screws ... less likelihood of damage to the socket and key perhaps, but maybe more of a tendency to strip aluminum threads? Studs and hexagon nuts seen to be the other option ... on some models they look superb, on others less so ... maybe I’ll try these next, but for now its another Elmer 3” spoked flywheel for the Factory Engine.

Kind regards

Geoff at Inky Engines



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