RE: [RCSE] Scale Dihedral Question...
Hi Stan, I did some work on a scale ship (5M), and I settled on a solid carbon rod from CSTSales(.com) around .75 inches (sleeved in alum to protect from dings). If you want to do some aerobatics, this is as small as I'd consider. I made my joiner tube from 3 pieces of brass tubing, 1 that went thru the body to the end of the root ribs, then 1 each in the wing to a depth of about 10 inches, past a subrib. I worked out the dihedral in the angle between the root and subribs. A lot of this depends on the weight of your ship, and if you're going to aerotow it vs winching it. You've identified your ship as aerobatic, that's tougher than just thermal. Less than 25 lbs will be considered 'light', and that will simplify things. If you can get in touch with some of the other scale guys out there, they will be able to give you some more ideas / size suggestions - the joiner / spar are the heart of your ship, make them right. I found a VERY helpful group of scale builders out there, hope you do too. Good luck, Brent RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
[RCSE] Scale Dihedral Question...
I'm building a "new" ship from an old fuselage. I know the airfoil, chord, etc. I am in an quandry as to the joiner construction area. What I want is an "standard" size aluminum tube joiner (probably from Gator R/C) that is straight. I don't think a "pre-bent" joiner will go through the fuselage due to width (but willing to listen). Right now 7/16 (9/16 with phenolic tubes) X 8" is about as big as I can get, assuming a 3 degree dihedral per wing panel (6 degree's total). I have top/bottom spruce spars (36" long) with shear webs as well. I feel that this is too small of a joiner. Almost forgot the span is 4.5 meters. Wing is to be covered in Obeechi. Weight will be "average" (whatever that means). I would like the plane to be strong enough to be mildly-aerobatic. Looking for input, 1) reduce dihedral (plane less stable, but what do most scale ships use) to 4 or 3 degrees total? 2) remove spruce spars and go with root rib/sub rib and add CF unidirection (full-span)? 3) go with a pre-bent joiner tube? 4) switch to a CF rod with approx. 7/16 dia? Steel rod (weight consideration **)? 5) switch to a glass laminate instead of obeechi? (really would like to stay with the obeechi) I realize that there is no one "correct" answer so I really am fishing for ideas/experience here! I really would not like to have $300 in the wing by going with full chord/span CF/Glass. +Stan RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] Please note that subscribe and unsubscribe messages must be sent in text only format with MIME turned off.
