Attkinson engine & the Pendergrast design..

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johnmcc69

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a lot of interest of this crazy little engine lately.
I have a copy of his hand drawn plans & build notes that were purchased years ago & have redrawn them in CAD for my own benefit of learning my CAD software, this was 6 or 7 years ago.

I have not built the engine but am wondering if others have? To the Pendergrast plans?

I see a lot of frustrations of building this from the Gingery book, I do have the book & can feel your pain...


D.Sage & Gordon (members here, & others as well..) have put in many hours building beautiful engines & have had problems making this one run.

An associate of mine has tried contacting the Pendergrast family to release these drawings but has had no luck.

I would be interested in hearing from anyone who has had any contact with them, or any other history of "BP Machine".

This is a really nice engine, & apparently, some of them run.

I don't want to reinvent the wheel here & totally understand copyright "stuff" & have freely shared drawings here, but maybe a collective effort could make a "runner".

Again, thanks to Dave, Gordon, & others for sharing their time, perserverince, & lost hairs on this.

John
 

Richard Hed

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a lot of interest of this crazy little engine lately.
I have a copy of his hand drawn plans & build notes that were purchased years ago & have redrawn them in CAD for my own benefit of learning my CAD software, this was 6 or 7 years ago.

I have not built the engine but am wondering if others have? To the Pendergrast plans?

I see a lot of frustrations of building this from the Gingery book, I do have the book & can feel your pain...


D.Sage & Gordon (members here, & others as well..) have put in many hours building beautiful engines & have had problems making this one run.

An associate of mine has tried contacting the Pendergrast family to release these drawings but has had no luck.

I would be interested in hearing from anyone who has had any contact with them, or any other history of "BP Machine".

This is a really nice engine, & apparently, some of them run.

I don't want to reinvent the wheel here & totally understand copyright "stuff" & have freely shared drawings here, but maybe a collective effort could make a "runner".

Again, thanks to Dave, Gordon, & others for sharing their time, perserverince, & lost hairs on this.

John
Can you tell us more? I have no idea; what this is. Sounds interesting tho'
 

stragenmitsuko

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I think , looking at the shape of the connecting arms and the governor on the crank shaft
this might very wel be a running example of the prendergrast design .
 
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Richard Hed

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Whoa, that's absurd! I'd like to build that. It makes me laugh. THat is a spark plug, isn't it?
 

dsage

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I asked the Youtube poster (in the video comments) which set set of plans he used. We'll see what happens.
I suppose various authors borrowed heavily from each other and I've never seen the Pendergrast (sp?) drawings but it looks a lot like the Gingery if it weren't for the governor.
Which brings up something I never thought about for the Gingery. How to control the speed other than to make a throttle for it (which it does not have). I guess just by limiting the fuel at the needle.
Interesting.
Thanks for digging that video up. I thought I'd found them all in my efforts to get to the bottom of the Gingery woes.
 
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stragenmitsuko

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he did make a throttle , look at the wood screw in the intake :)
 
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Richard Hed

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Aha. Apparently there are numerous different spellings.
Altho', when I pay attention, I am a very goo speller. In the 1850's and before, Mercans spelt things any way they sounded. But during the 1850s, Daniel Webster wrote his Spelling Primer. after that, things had to be spelled with certain rules--the silly rules we have now. Look at how the constitution was written in the old days--all nouns were capitalized on the first letter. That is also how th e Germans write nouns today. At one time (Shakespeere spelt his name at least 25 diffeent ways), General Jackson (later prez.) argued with someone (he was quite contentious, after all) that his opponent couldn't even spell (some word) 25 different ways! That's pretty funny in my Haughty Opinion. My point is that I believe Daniel Webster ultimately did a grave disservice to Merica. BTW, General Grant (my Hero) is thot to be a notorious speller today. But he certainly was NOT by his times standard--He only became famous a few years after Webster's disasterous book.

I ahve to admit, when I see horrible spellings I am put off, I have to consciously consider my own thots on that, that is, it is not the spelling that is important but the meaning. Can the poor spelling person put two ideas together and come up with a third or fourth idea? That's important , not spelling, not punctuation (except if you read Churchill's writing one has a difficult time understanding him because he doesn't use any commas).

Also, we might pay attention to how our mother country spells things. Spelt, learnt, and many other words that sound much more like how they are spelt.
 

GKNIPP

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John converted these to CAD drawings for me. I have a set of them but have not built it yet. They were originally hand sketched by Brooks Pendegrast and I got them from him at a NAMES Show in Wyandotte, MI some years back. I received Mr. Pendegrasts permission to share them.
 

L98fiero

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John converted these to CAD drawings for me. I have a set of them but have not built it yet. They were originally hand sketched by Brooks Pendegrast and I got them from him at a NAMES Show in Wyandotte, MI some years back. I received Mr. Pendegrasts permission to share them.
I'd be interested in a set of the plans. It will be a while before I get to it but they look to be interesting and challenging.
 

dsage

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If you are sure they are not protected by copywrite I'd be interested in a set. If for nothing more than to see what was done differently to make it work compared to the Gingery engine.
What CAD package were they created in?
 

Gordon

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If he gave permission to share the sketches I would certainly like to get a copy of the sketches.
 

GKNIPP

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Absolutely, I will share the beautiful CAD drawings John did. They are much clearer and dimensioned better. I had asked him when I bought the original hand sketched prints if he would allow me to share them and he gave me his blessing. If I remember correctly he was getting out of the business at that time. ( Here is the assembly views and finished dimensions as an example of the improved drawings by John.)
20200621_023749.jpg

If someone would tell me how I could put them in the downloads section, it would save me having to send to everyone. There are (24) 8.5x11 sheets of detailed drawings.
 
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stragenmitsuko

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Sweet , I'll be building one for sure .

Greg if I'm not mistaking you can put all the files in a single zip and then just add it to post like you did with the drawing above .
More experianced users correct me if i'm wrong please .

pat
 

Richard Hed

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Sweet , I'll be building one for sure .

Greg if I'm not mistaking you can put all the files in a single zip and then just add it to post like you did with the drawing above .
More experianced users correct me if i'm wrong please .

pat
I have a lot of files in bitmap form (*.bmp) but they are not allowed. but JPEGs are allowed. when I get some time, I will convert some bitmaps to JPEGs and put some stuff up, but most liekly in the future as I managed to get a summer time harvest job.
 

dsage

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I'm confused:
Who is offering the drawings??
There are two of you responding here. Richard Hed and GKNIPP.
In any case there is no need to convert the drawings. Just ZIP them into one file and attach them in a message or upload them to the Uploads section.
 

Richard Hed

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I'm confused:
Who is offering the drawings??
There are two of you responding here. Richard Hed and GKNIPP.
In any case there is no need to convert the drawings. Just ZIP them into one file and attach them in a message or upload them to the Uploads section.
I have some drawings -- the Corliss Cole Ray drawings that I have in bitmap. They are not the same as Gknipp's. This forum will not accept bitmaps. I was going to convert them to JPEGs but now you have given me a much better solution. Thanx.
 

dsage

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Richard Hed:
Thanks for your offer - but does this Corliss Ray engine run??
We were interested in the Pendegrast design drawings because it has been shown to run.
Now you're throwing in another version and getting things confusing (for me anyway).

The more the merrier I guess. Upload them and we'll take a look.
Thanks
 
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