Comment

Comment by david shrader on November 18, 2009 at 12:26am

thankyou Chris

Comment by Chris Aysen on November 9, 2009 at 2:22pm

VERY AMBITIOUS guys. Best of luck.

Comment by david shrader on September 13, 2009 at 2:52am

Thanks for the comments Robert. The splice at the tip has a serious doubbler and we plan to lap the skins outboard of our spar splice. We also took this extension very seriously and used the 43.13 as a guide (43.13 has no reference on pop rivits) we also used structural adhesive at the splice and lastly, we are confident of this mod as we have done a coupple spare spliceses on the cessna 207 over the years (one ground loop, one tryed to top a tree with the wing). Our web doubbler is also one size bigger and also has structural adhesivie (hysol) the extrusions are 3/4 3/4 by .125 with hysol .....wish I knew the details of the beefer atachpoints as im shure i would have incorparated them in the mod as well. Great work! (fun isnt it)

Dave

Comment by Robert Pelland on September 11, 2009 at 6:32am

David, with out knowing you, or anything about your projects, it look's as though I have taken the exact same route as you have with my 701 wing mods. No slats are being built, and VG's will be used on the main wings, along with " tail feathers " under the elavator. I also eliminated all the .016 mil and replace it with .020 everywhere. The wings were lengthened by 550m ( 18".6 as was previously authorized by M. Chris Heintz ) but I was not comfortable in adding anything of any length to the wings, past the outer strut attachement points. The route I chose was to insert the extension squarely between the fuselage, and the outer strut attachement point. This way I am convinced that I, in no way, affected the structual intregetry or strength of the wings. Also, every piece aluminum that is used in the construction of the wing was full length of the wing, with no splices
Since I to will be using amphi floats, I went the extra mile, and used the thicker, and slightly bigger mounting doublers ( a-la-750 ) at all the wing attachement points. I also have a set of the first offical factory set of plans for the 750, so some of the other parts that I will be using on my wings, are the same size, and thickness as seen on the 750. An example is the upper and lower main spar caps that are 1.00" x 1.25 rather then the .075" x .90 that is normally seen, and every doubler, along with the flapperon brackets, have been increased one size. I will try to include a photo of my main spar to this response, so you can see exactly where the additionnel length ( look for the two strips of masking tape ) was made. Lastly I pondered for quite a while the addition of the extra ribs, but after seeing the video of Bob Johnson's 701 Alaska , I decided to go another route to eliminate the oil canning. He solved the problem by riveting three small fences to the top, outer skin of his wings, and I believe this was two fold, since in every certified STOL kit manfactured today, the very firsts modification that is made are the installation of these fences. In this case it reminds me of the two birds with one stone thingy. He eliminates the oil canning, and increases the performance of his wing with the STOL fences. Please note that all the above mods or comments are my personal views, and not instructions to anyone contemplating any major modifications to their aircraft.

Good luck with your builds, and keep posting your photos.



Robert Pelland
the 701 & 750 Scratch builder