Hi Phil, congratulation ! Very nice.
I have some questions about your horizontal tail.
Do you have front spar ? ( It seems to be impossible to assemble the front spar and ribs on original plans ! )
How do make the rear spar ? ( you said the skin is structural !? )
How do you attach your tail with the boom ? ( like originals plans ? )
How do you make the hinge ? ( carbon too ? )
Sorry for so much questions, Bertrand.
The topic has been locked.
Progress on Phil Lardner's All-carbon CD? (Part 1)
02 Jun 2015 11:29 #893
Horizontal Stabiliser Front Spar:
You're right - you can't build the H-stab in carbon as you would in wood, and I had to have a good think about it before I tackled that problem. My solution was to fabricate the front spar in one piece on an A-shaped mold (rather than the gentle curved shape of the original wooden spar) with a single carbon rod in each of the four spar caps. You can see the 'A-shaped' mold I used to shape the front spar in the photos below.
I then cut the H-stab ribs at the correct angle to allow the front spar to be bonded to the cut ribs. The 'nose' sections of the ribs were then bonded onto the spar to give the final shape. This worked very well. I also used this method when constructing the vertical tail.
I tried making the carbon (female) hinges in the manner described in the original plans and builders manual but found the method unsatisfactory... and the results a bit of a disaster if I'm honest!! So I made the female hinges in two parts and bonded them together later. I made one long length of hinge 'stock' and then cut it up to size on my table saw, and shaped the top of the hinges using a bench mounted disc sander. Each half of the female hinge was made from five layers of carbon cloth. The two 'halves' were then glued together and 1" wide reinforcing strips (made up of 17 layers of carbon cloth) were glued either side of the hinge top. The results were excellent!
Apologies for the erratic behaviour of the forum software lately - it is making a mess of rendering the posts and is difficult to read.
This appears to be being caused by old system code that contains deprecated commands and syntax no longer used by the latest version of PHP running on the server. I have raised the matter with both the forum and Joomla software developers, but it may take a while to get fixed.
Rick, greetings.... I had not looked at this site since heading back to the midwest in late April. I am catching up and enjoying it plenty! I am curious about the drag beam interconnect you mention. I think the beam through the boom is layed in perp to the center line of the boom in my plans but the fittings either side are twisted to present to the wing attach tangs. This seems to work fine on mine all these years but I see no reason to not build it with the through @ the (4 degrees)? and keep the plates flat for ease of construction. Am I making sense?
Also, I could use some new leading edge skins for my wing and wonder if you might be interested in creating some for me? We can talk if you are game to.
Wondering who is the third CD @ Wallabee? Is Steve Arndt still flying MD there. Steve and I took apart the POC with our plans in hand in Hutchinson, KS I think it was in 1995. I have not heard much about him and his MD for at least 8 years now...can you update me please.
Yeah, we all owe a BIG thanks to Phil for setting this up and the ongoing efforts to keep it going.
I guess I would have to see how you twisted the mounting plates. They mount with the drag beam sandwiched in between and it doesn't seem like they extend past the beam far enough to twist them the 4 degrees you would need to match up with the rear wing connectors.
I took my leading edge molds to Wallably because Mick was thinking about building another one but has decided against it now. I'll be bringing them back home and you are welcome to use them.
The third CD at Wallaby is mine when I head there in the winter.
Steve has not flown his CD for several years. He built a motorized Silent 2 and is flying that now. He competes a lot and does very well. I think he may have set a FAI distance record with his CD before he quit flying it
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