|
High Sierra RC ClubAMA 1362 - Sam 34Dedicated to the World's Greatest Hobby!! |
Dan's 120" B-26 Douglas Invader - Page 3
|
October 14, 2005 " Ideally, the ailerons will have a slight twist as well. That's why some designers have the ailerons attached to the ribs while you sheet the wings, and then cut the ailerons free afterwards. The hinging shouldn't be a problem. " - Jim Thanks guys! Yes Nigel, it makes sense. Jim, the plans say to do as you suggested. i.e., cut off the ailerons after you add some sheeting on the bottom and the top. Hmmmmmm.... will have to decide how I want to proceed next week though as I have to leave town for a few days. But I am still concerned about the aileron hinging. Is the hinge closest to the wing tip on a straight line with the others (which means it will be located lower as compared to rib 18? see first picture of above post) Seems like it would have to be, to work properly without binding. I think what bothers me is that the leading edge of the aileron at rib 18 will look strange when deflected. Maybe I am thinking too much. Maybe it is such a minor amount that it does not matter! "The hinges should be lined up. From the way the aileron is drawn, it looks like the pivot point of the hinge would be in the center of the radius of the aileron LE. That means you'll have to make cutouts in the LEs so the hinges will be recessed. Robart hinge points work great for that." - Jim November 1, 2005 Believe it or not, I have made some progress! As to the washout, I decided to blend it in gradually from the rib 18 which is at the end of the aileron to rib ? at the start. I added 7 mm to the stand off at the back of rib 18, 6 mm to rib 17 and so on. Sorry I don't have a pic yet, but the wing is coming along. Spars are in along with their webbing. Wing joiner tube is in. Most of the leading edge is on. Sheeted from front spar to leading edge. Dihedral braces between wing halves is done. Plans call for hardwood infill in a couple of places. Didn't have hardwood at the time so made a sandwitch of balsa and ply layers instead. I also made the wing tube a couple of inches longer so that it fit into two more ribs. Noticed on the nacell crutches that there are no cutouts for the wing tube to fit, so will have to do some serious cutting when I join them together. Also I cut off the end of the ribs where the flaps go and will build them separate, but left the ailerons connected to be cut off after sheeting. The flaps do not have a easy shape to cut on the leading edge so I think it will be easier this way. I know that when this part is done it will be worth it, but man, what a lot of measuring and cutting! On another subject, the guys at the 122nd have finally been able to get into their hangers. What a mess! 122nd.com/Briefings/road_to_recovery.htm It's not only people that need help, but perserving history too. Close to my heart as well. ussalabama.com/html/photos I used to live in Mobile when I was a kid. School kids at the time where asked to contribute a quarter to help tow the USS Alabama to Mobile and establish a memorial park. I did, and received a ticket for admission. All these years (40+) I have been wondering if they will still honor that ticket. Re: the engines on my A-26. I have flown my extra 300 with the YW48's. Very underpowered and scary (for this size plane). I just bought a NIB FPE3.2 to replace them from a local club member. Haven't flown it yet but it is much more powerful. But, what a difference in vibration! The twin 48's are so smooth compared to this single cylinder 52. I am glad I spent the bucks for the twins because of the lack of vibration. I am sure that they will have plenty of power for the A-26, and nothing hangs down to scrape on the ground should anything happen. November 10, 2005 I know this will surprise some people! It does me, but I have a real-to-goodness update! I received my lighting system a few days ago. Now I have spots in my eyes . Look into the lights. Your getting sleepy! Your eyelids are getting heavy! Send me all your money! 
The light that you don't see on is the blinking white strobe light. It works, but I was not quick enough on the draw with the camera. The two landing lights will pop out from under the wing some how (haven't figured that out yet). BTW this is from Electrodynamics. Electrodynamics The nav lights turn on when you power the rx. The landing lights can be controlled by the tx. It has a separate battery connection for the landing lights but I am going to have to read the directions because I think the nav lights run off the rx battery. I also purchased (some time ago) their fiber optic kill switch and their power-bus. And that's not all! I have done alot of work on the wing. Here's a shot of bottom. Still lots to do to it though, but I was getting carried away, so decided to stop here and start on the other side. Each wing splits in two for ease of transport. I used Merlyns method of bolting the outter panel on at rib 7. The wing was built as one piece and then cut at rib 7. It was quite exciting to cut through and then be able to rejoin them with the tube and bolts. 
Top side! Here you can see the brass tubes sticking out (to be cut down) and the cutouts for the flaps. Aileron still attached. Still needs more leading edge and wing tip shaping. As an aside, the real Invader had wooden wing tips. 
And a pic of the wing standing proud! 
Now, I have to do this all over again! Page 3 Next Page |
