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Author Topic: Help with blade plan translation.  (Read 296 times)
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VictorY
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« on: May 01, 2022, 08:45:04 PM »

I'm usually pretty good with understanding what plans are trying to communicate to the builder, but wanting to build the exact blades that the designer is calling for on the Torontonian, I need a little help with this one. The top drawing I get, I think. It's the overhead view of the projected shape of the blade, with the root on the left and a hub center line about an inch to the left of the blade root. The bottom drawing gets me though. It looks like the root is now on the left and they are trying to give you an idea of the tip profile?

It doesn't look like a lot of blade but I don't know much about large rubber.

Thanks
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NormF
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« Reply #1 on: May 02, 2022, 12:14:33 AM »

I’m guessing this a Bob White style prop block. Look at the online Bob White plans and photos, example: https://outerzone.co.uk/download_file.asp?planID=12486&FileType=Plan&Filename=Twin_Fin_oz12486.pdf
Keep asking questions!
NormF
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VictorY
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« Reply #2 on: May 02, 2022, 02:36:23 AM »

So something like this, with the root and inner half of the blade sticking out in front of the pivot point, and the tip sweeping back a bit, more in line with the pivot?

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VictorY
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« Reply #3 on: May 05, 2022, 12:29:58 AM »

Hopefully I'm on the right track. It just looks very different than any large outdoor rubber prop I've seen lurking around on the internet.
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NormF
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« Reply #4 on: May 05, 2022, 01:17:13 AM »

This is from a different post, but they are blades carved in the style you have. See: https://static.rcgroups.net/forums/attachments/4/4/5/6/3/a8331609-35-photo.JPG

I think you have the right idea. Before you get too far you should drill the Z bar location. I have some blanks and tomorrow I’ll try to get some photos.

Norm
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VictorY
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« Reply #5 on: May 05, 2022, 08:04:37 AM »

Thanks. That assembly on the bottom looks pretty close to what I was seeing in my mind.
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NormF
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« Reply #6 on: May 05, 2022, 08:06:43 PM »

PM sent

Norm
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VictorY
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« Reply #7 on: May 09, 2022, 08:39:37 PM »

Thanks for all the detailed help Norm. I've still got to make a lot of balsa dust and carve out the front side of the blade, then finish the other one, but there's a good chance I might be able to maiden the Wakefield with the proper propeller. Smiley These blades should slide right on to my current hub and fold parallel to the fuse like the other ones.
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VictorY
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« Reply #8 on: May 10, 2022, 10:12:58 PM »

Almost finished. I need another hour or two of final shaping/sanding, then I can spray them and install the hardware.

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