ianober

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Did another quick video this time with the stab on the pivot rod. Looks pretty good. The motion looks solid, now i just need to figure out if the control arm is long enough to give proper leverage for the servo to work the stab while under airflow. I did a lot of sanding on the fuse last night so hopefully after tonight I might have an updated pic of the plug for you guys.

[youtube]http://www.youtube.com/watch?v=O18tHSYP2JE[/youtube]

ianober

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Ok, I have another rendering for you guys too. I have been trying to find a way to do a scale fowler design so I might be able to come up with something better than what Robart offers. I threw this together real fast so it will probably need to be tweaked here and there. Next to it are a couple of pics of what I have on the A-6 flap system, not truly revealing photos but I am going to go back to the museum and see if I can get some better ones. Maybe even convince someone to pull an access panel or 2 off to get some real good views

[youtube]http://www.youtube.com/watch?v=nOijDv2O964[/youtube]

JRSmith

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Looks good Ian. If you need any pictures or measurements that you do not have, let me know. We have a A-6 at the Pensacola Naval Museum, and I don't mind going over there to take pictures or measurements if required. Take care.

Jason

ianober

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Thanks for the offer Jason, I appreciate it. I would say that if you find yourself over there and you can get some good shots of the fowler flap mechanisms then that would help a lot. I should be able to see them if I can get on top of the wing (which I got on last time I was there) and can lift up the spoiler. That should give me a good shot of the rails and mechanism. Last time I was there I took about 100 pictures and now I need about another 100, go figure.

George

My Feedback: (57)

Ian,

I have never seen those up close before, is that a "screw-jack" type mechanism I see in there that operates the flap?

JRSmith

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I will try and get some pictures next time I get over there. I will try and coordiante it with the staff to show up a little early and get on top of the wing. Talk to you later.

Jason

ianober

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George, I think it is some sort of jack screw system. I am trying to figure out how they get the flaps to deploy without racking and coming out uneven. I think each one of these rails has its own jack screw, 4 on each wing, which keep the flap from coming out "cock-eyed".

NickC5FE

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Ian, your tracks and movement are exactly what i am going to do on the C-5, it is the scale movement as the full size! Looks great bud

ianober

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Cool Nick, thanks buddy. Yeah I wish I had a video of the A-6 extending and retracting the flaps so I can figure out how far the flap comes out before they droop. Like I said, hopefully I can get some inside looks at the mechanisms at the museum.

ianober

My Feedback: (12)

Finally decided to get off my but and do some real work. So besides a lot of sanding this weekend the fiberglass and resin was busted out and I went to town on one of the wings. Hopefully this will get the progress moving better now. The plug is really starting to show up nicely now. The windscreen is coming out well as well as the inlets. Starting to take shape!!

ianober

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I received the stab cores from Bob Mellen at Flyingfoam.com and they look great!! I will be sheeting these ASAP and getting them ready for detailing just like the wings!! I will post some pics soon.

cmjets

Ian:

Great nose !!!

I love it.


Regards from Spain.

Carlos.
______________________________

http://cmjets.blogspot.com/

ianober

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Thought I would share something I just bought off of eBay with you guys. It has been pretty cold up here this winter and thus the garage has been fairly cold as well. It has been lengthening my drying time for several things as well as just making it uncomfortable. I need a heater basically. So I started looking around and found these on eBay. They seem pretty solid, radiant heat, low power consumption, instant heat, no burning dust. When I get it and hook it up I will report back to you all and let you know if they were worth the price.

[link=http://cgi.ebay.com/INFRARED-HEATER-4-GARAGE-COTTAGE-BASEMENT-PATIO-SUNROOM_W0QQitemZ190365863714QQcmdZViewItemQQptZLH _DefaultDomain_0?hash=item2c52b08f22]eBay Heater[/link]

mselby

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You just need to move here. We probably don't have a store in country that sells heaters.
Mike

ianober

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LOL, I bet that is true Mike. I dont think you ever have a problem with your resin curing!!!

ianober

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I ran by the hobby shop yesterday to get some more 1/16th balsa so I could laminate the stabs. Time to break out the vacuum again, sheets have been glued up for the skins so I am hoping to have the stabs done by the end of the weekend. Probably not much done tonight as I will be gone at the Sharks game!!! More soon though!!

David Searles

My Feedback: (49)

Ian,

I've got a ton of "ultra lite" 1/16" balsa from my old pattern aircraft building days. It's been just sitting in a shelf in my workshop for years. If it'll help I'll box it up and send it to you.

David S

ianober

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Oh man, now you tell me Dave!!! Thanks for the offer buddy but I dont think I need anymore balsa as the Stabs are the last to be sheeted.......I think. But if I do I will let you know, that would be a great help buddy, thanks!!

ianober

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The stabs are in the oven cookin!!!

invertmast

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Looking good ian... Have you decided what resin your going to use for making the molds yet?

ianober

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I think I am going to go with the MAS Epoxy Thomas. So far I am liking it a lot and it is a little cheaper than West Systems. I am going to use a tolling resin from and Aerospace company though for the gel coat of the molds. ACP Composites sells it and it about $35 for a quart kit. It will be worth it though for a good hard surface on the molds.

I pulled out the stabs from the bag and they turned out good. Just need to trim them and clean them up then I will post some pics.

ianober

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Ok guys, I am looking for some opinions. I am going to order the wing tubes so I can jig up and get the wing separation line done so I need to know what people would like to see on a plane this size. I am thinking of a forward tube on the range of about an 1 1/4" and a rear tube of about 1/2" to 3/4". The rear tube would possibly be solid if necessary. Let me know what all you guys think and what you would feel good with strength wise.

yeahbaby

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whatever you do it's going to be awesome!!!!

keep it up.

rhklenke

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Ian,

We are working on the design of a medium size UAV right now and we are looking at the same problem. I have not found anything yet that gives me an easy to work with formula to calculate the bending strength of 6061 aluminum pipe of different diameters and wall thicknesses. What we are doing is looking to see what size tubes are used on aircraft with similar weights and wing loadings. Then to test it, we are going to proof load the wing/fuselage structure to the gross weight and number of G's that we expect the airplane to be able to handle (125 lbs and 3 G's, in our case). That means that we'll mount the wings upside-down to the fuselage (or a "simulated" fuselage structure) with the wing tubes and place 375 lbs of weight on the wings. The weight is distributed across the wing according the the distribution of the wing area (actually it should technically be placed according to the distribution of lift, but that's hard to measure with out a wind tunnel, etc., and using wing area is close enough). For our aircraft, it has a straight rectangular wing, so the weight distribution is easy, but for a tapered wing, you can swag it pretty close just by eye or using simple geometry.

If this is a kit that you intend others to build and fly, you should really think about proof loading it (and documenting the results) to insure that the wings are not going to come off in normal use - *and* be able to say with confidence, that if they *do* come off on someone, that they did something wrong in the build or over G'ed the aircraft...

Bob

rhklenke

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... duplicate post