RE: Rollin' my own 50CC Yak 54  
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RE: Rollin' my own 50CC Yak 54 - 12/7/2005 5:15:44 AM   
Couch-pilot



Posts: 191
Joined: 11/10/2002
From: Burlington, ON, CANADA
Status: offline 		Count me in for a copy of the plans when you're done, thanks. This looks wicked.......

edward@diewire.com

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       Post #: 51

RE: Rollin' my own 50CC Yak 54 - 12/7/2005 6:39:08 AM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		Glad to see there is interest in this project! Don't count on plans being made available until this is actually built and test flown. I want to make sure there are no weak points in the design and will be putting the airframe through its paces including hard walls, parachutes, KE spins and even harrier landings to ensure it is top notch.

Here is a small part of the project...I spent an inordinate amout of time creating those little side formers (green/purple). I basically realized that I had to remake the canopy templates into more oval at the top and round at the bottom. Reason was that those side formers would have been on the inside of the fuse box which obviously wouldn't serve much purpose. So everything got widened and that takes time. They will interlock with the side and top fuse box to keep things straight. In the end the fuse shape looks much better than before not even taking into account my miscalculation. Anyhow, these mini side-formers will be sheeted along the flat horizontal edges. I will add a couple side stringers on the rounded outsides for the outside sheeting support.

Good news otherwise...I am pretty sure this will be an incredibly fast build given how much interlocking construction there is. The fuse should practically assemble itself without having to pin it to a building board or jigging it up. The wing has been designed to be jig built using four 0.24 carbon rods. I've never trusted jig tabs.

I may take a bit of a break from this because it is getting a bit unhealthy, especially when you actually dream you are working in autocad! Scary

Cheers,

John



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RE: Rollin' my own 50CC Yak 54 - 12/8/2005 7:31:11 AM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		Fuse is definitely on a diet!

Cheers,

John

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RE: Rollin' my own 50CC Yak 54 - 12/8/2005 12:13:11 PM   
Brent G



Posts: 428
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		Looks great. Where are you planning on having it laser cut? I have never looked into having that done. Do you know about how much that costs? I cut all my planes parts out with a band saw and a scrowl saw. Like you noted earlier that kind of limits how much lightning you can do. But If I could get the parts laser cut for around $50-$60 I would have it done in a second.

Brent

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       Post #: 54

RE: Rollin' my own 50CC Yak 54 - 12/8/2005 5:02:22 PM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		I will be contacting AK-Models.com to get a quote from them shortly. There really isn't much point until I get the CAD done and I know how much wood I'll need. AK seems to be the only cutter I can find that can cut greater than 30" lengths which will be required for the fuselage. I have a feeling that whatever they quote for labor on top of the materials cost will be reasonable relative to how much time it would take to cut by hand. I just can't see anyone putting the fuse together without getting it laser cut since there are so many interlocking tabs and lightening involved. Even if you wanted to put in the time to cut each little tab and corresponding holes out, it would be very imprecise and the whole fuse would probably end up rather crooked. The wing, on the other hand, is pretty straight forward and could be hand cut...the only caveat being that you drill the jig holes accurately.

Cheers,

John

< Message edited by SydDythers -- 12/8/2005 5:03:01 PM >

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RE: Rollin' my own 50CC Yak 54 - 12/8/2005 6:05:23 PM   
Brent G



Posts: 428
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		Thanks. I am interested in what they will charge also.

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       Post #: 56

RE: Rollin' my own 50CC Yak 54 - 12/9/2005 6:32:38 AM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		I'm lazy tonight so no updated pics but I have made major progress. The wing is now 99% done, all that is needed is to design in a couple ply brace supports on the forward and aft part of the root and second ribs to support the carbon fiber anti rotation pins.

After some consideration, I changed the layout of the outer fuse box lightening holes and they now conform much better to the wing, which, incidentally, I moved further forward along the fuse by about 1.75 inches which should improve the 3D capabilities of the airframe. This is a good thing in my opinion since I am designing it to be a 3D machine first, so, some precision manoevers may be less precise.

I did some reading on what this might cost to get cut and I've concluded it will cost in the $60 to $75 range, above and beyond the cost of materials. Don't hold me to it though since I've never had anything cut before.

Cheers,

John

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RE: Rollin' my own 50CC Yak 54 - 12/9/2005 11:26:11 AM   
Brent G



Posts: 428
Joined: 3/31/2004
From: York, SC, USA
Status: offline 		John

I just talked to a laser cutter that is an hour from me. It will cost $100 per hour for the laser time. They told me that the balsa and light ply would cut very fast. I think you are probably pretty close on your 60-75 estimate. I would gladly pay that amount to have a plane cut. Accuracy and repeatabilaty cant be beat. There is just far to much detail to cut by hand and get the parts to come out + or - .005

Brent

< Message edited by Brent G -- 12/9/2005 11:27:56 AM >

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       Post #: 58

RE: Rollin' my own 50CC Yak 54 - 12/9/2005 5:55:27 PM   
50%plane



Posts: 3759
Joined: 3/8/2005
From: x, , USA
Status: offline 		SydDythers,
I'm interested in your plane also. As a general rule I don't get untested designs, but in your case I'd heavily consider it. Your design looks great.


Woops

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RE: Rollin' my own 50CC Yak 54 - 12/11/2005 1:44:48 AM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		Coming together! Everything on the wing is done. The fuse is completely done forward of the last former. I still need to add stringers though. All that's left to do now is design the aft section of the fuse and the tail feathers.

The rendered pics don't come out all that well it seems and some of the arcs get flattend into polygons so there aren't too many smooth circles (especially the formers). The actual rendering in my autocad is perfect though. However, things are even bogging down severly on my desktop system and I have a 3.2Ghz P4 and high end graphics card. Unfortunately, you need to buy an opengl card to get good performance.

I'm getting close!

Cheers,

John

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RE: Rollin' my own 50CC Yak 54 - 12/12/2005 4:13:49 AM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		Well, in the "Two Steps Forward, One Back" department, I learned today that all plywood is metric even if a website quotes it in imperial units. Unfortunately I did the design work in imperial and will now have to convert into metric and resize some of the parts. Sigh....

Cheers,

John

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RE: Rollin' my own 50CC Yak 54 - 12/12/2005 9:32:15 PM   
Tommee


 

Posts: 33
Joined: 9/4/2003
From: Zagreb, CROATIA (HRVATSKA)
Status: offline 		...nice work..one thing that I do not understand is how those pictures are rendered so bad...did you render them directly as jpeg or???
...here is mine...this is wing of my modified diablotin xl...my winter project...and fuselage is my telemaster which, I hope, will go into production next year...oh, I am using solidworks...

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RE: Rollin' my own 50CC Yak 54 - 12/12/2005 10:01:55 PM   
SydDythers



Posts: 569
Joined: 1/21/2002
From: Toronto, ON, CANADA
Status: offline 		Well, as it turns out, there is imperial plywood out there afterall. However, I found this out after changing the model over to metric haha! Fortunately I saved the imperial version too. I did decide to increase the thickness of the side of fuse on both versions so that took some time. I've sourced a laser cutter near Toronto for this project (will improve turnaround for me) and they utilize imperial sized plywood, specifically, Finnish Birch which is not much heavier than lite-ply but is 5 times stronger according to them.

Tommee, your designs looks great! I can't figure out the rendering part of Autocad it seems and I have more important things to do with my time. From what I've read, rendering in Autocad is a pain and is better accomplished by exporting the model to Bryce3d or equivalent to get things looking good. Plus, the materials library in Autocad is terrible.

Cheers,

John

< Message edited by SydDythers -- 12/12/2005 10:43:38 PM >

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