alex5

ok,ok! double-slotted high lift flaps

bogbeagle

Spectacular video of Caribou crash.

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https://www.youtube.com/watch?v=YydkHy2P0dU

ByLoudDesign

That makes one sick!! Wonder where that was?

alex5

I think it was winnepeg ,manitoba.All 3 crew killed on impact

alex5

apparently Hank Harjes is doing a build of this plane,as well.He has made a few of the De Havilland planes.

bogbeagle

I understand that the machine had just been overhauled and fitted with new engines (turboprop?). The flight was a proving flight.

ByLoudDesign

I know it eventually worked as when I searched www.airliners.net for photo to detal there were a couple of photos in the almost 3000!

alex5

Just a step further,I am drawing up a Caribou in cad,8 ft ws.How did you plan on fabricating the wing spar...joint in the middle,or continuous from engine nacelle to engine nacelle.Doug Bartley's Buffalo was joined in the middle,and he found it wasn't the ideal method,as the main gear put quite the load (stress) on the join area

alex5

Has anyone got a overhead view(photo) of the engine nacelle?was wondering if the line from the exhaust port to the front air intake is straight or curved...most photos dont give enough detail,as they are from below.

ByLoudDesign

They are straight fore and aft, and vertically follow the curve of the wing in several equally sized straight sections

alex5

Thanks...that was one of the ones I have.I was kind of looking for the shroud shape,over top of the air intake.It is easy to take a photo,then scale the necessary component,and lay it down on my 3d solid model,and proceed to trace,the outline of the air intake.from all the photos that I have been able to source,it seems like it widens in an arc,from the propeller Hub to the max chord area,I just dont know what arc.

ByLoudDesign

alex5

the red line is the contour I need,from the vertical view....My thinking is ,that it is the vertical profile,rotated about 20 degrees from prop center...but there is no data about it,or how the contour was created.It sounds kind of persnickedy,but,that is one shape that defines the r2000 and the nacelle.So,when you look at it from above,do you see a curved shape,projecting from the nacelle,or do you you see a rectanglar shape.that is the intake,

alex5

wait till tomorrow,I will make a isometric projection,to illustrate the dilemma,or problem of interpretation,that I am suggesting.

ByLoudDesign

For some reason I am not getting notified about new entries on my own thread!!??
Here is what I came up with from many photos, because hardly any of the 3/6 views I came up with agreed.

alex5

[QUOTE=ByLoudDesign;12043901]For some reason I am not getting notified about new entries on my own thread!!??
Here is what I came up with from many photos, because hardly any of the 3/6 views I came up with agreed.
That was about as close as I could get as well.There were many drawings where the arc was greatly exaggerated and that view is easily pasted and scaled to suite.Thanks.that is perfect.

alex5

here is the beginning of the process.I import the view that I want,,then having traced from other views,the profile,I then extrude the solids,to create a combined solid from the 3 views.Note:this is where you detect discrepancies in the 3 views.

alex5

Keep in mind,most views are axis based,rather than planar .The view imported above,in grey,is based on a perpendicular translation of what is a shape that was formed on an x/y axis then rotated by about 10 degrees.The cooling intake vent ,would have originally been designed on an perpendicular axis,then simply rotated ,to suit the engine ports ,when installed.When we try to replicate that,we must bear in mind the original engineering intent.So I draw a profile with the intake at vertical,produce a number of slices to generate the actual,and then loft those profiles.I then rotate that solid ,10 degrees,and slice it by the wing profile(surface) to make a perfectly fitted engine nacelle.

alex5

Not trying to get anal about it,when you rotate two curves a minor 10-20 degrees that are symmetrical along an axis,as you rotate them,one curve becomes more resembling a straight line,and one becomes more curved,when trying to draw it from a 3 view perspective.These were curves drawn in 3d to begin with.
I also noted that no 3views of this airplane are consistent.It was easier to put to relatively similar photos together,and compensate for the angle of viewing,to try and get a planar view.Without having the manufacturer's(dehavilland,and now Viking) engineering blueprints,and given the scale,it is just more convenient.

alex5

Discovery.ca,mighty planes video,c115 .Excellent video of the buffalo,which uses almost the same fuselage,in a T tail,and turboprop PW6 engines.Gives good close up of the flaps operating.

alex5

here is a composite screen capture of the general process I use,after creating reference lines from a 3 view.I collect many stills,and snaps,putting them in various planar views,and build my cad model.The hump in the nose of the Caribou is particularly troublesome.Alex

alex5

Charles: Did you ever manage to sort out the flaps ,and aileron connections?I have the line drawings that seem to indicate that the outer section is essentially connected by a storm door vacuum connector,the wing mount is a longer bar,and the critical element is a smallish T shape.The mid section of the flap aileron,hinging has a large chunk of metal to allow the spacing for the hinge point.

ByLoudDesign

Because of financial difficulties an a full time job that was a bless from God that is saving my home, I have not got to work on her for some time! I did get a full maintenance manual from a source in Europe. Because of it I was making great headway with most of it figured out. I will get back to it when I get the paid for project, Beechcraft 350i King Air done. It pains me to get so close to having her done to put her aside.

ByLoudDesign

Well The Beechcraft 350i King Air is completed!!! I have to do some clean up on my website it is very dated and need to shown thr 350i as a available model. Then I will be FULL TIME on it till it is done!!! expect it will take a month or more as I have to deside how to provide something the modeler can build for all those split flap/flap and flap/ailerons. There are 12 control surfaces, and the are thin and long even for the model as big as it is. Have the hinging of all that nailed, and looking hard for a way of making the linkages that are scale, and still be adjustable. I'll keep this thread up to date now that the design is happening again!

alex5

Have you considered 3d printing the attachments,using a service like 3dHubs.com?