Posts: 474
Joined: 4/4/2007 From: Woodville, WI, USA Status: offline
I've been reading this thread (actually read through it several times) and I've been undecided about adding flaps or not. In another thread, it was suggested flaperons weren't really a good idea.
But back to "to flap or not to flap." One discussion talked about how adding flaps reduced the aileron area, and hence the agility.
So I came up with the following idea.
Ailerons would be built as normal, the length of the wing. The servos controlling them would be a ways out on the wing.
Air brakes, (at least I call them air-brakes) would be added to the bottom of the wings nearest the center. These air brakes would be about 10 inches along, and controlled by the "flaps" servos.
I included the picture below. The first is a typical wing profile without the airbrakes. The second is with the airbrake installed, but in the "tucked in" position. And the third is with the airbrake deployed. I saw the hinge idea on another thread somewhere, I can't remember where. It's two control horns, one on the wing, the other on the flap, but connected together in the farthest hole. I liked the hinge idea for its simplicity of execution.
The scale isn't perfect, but I think y'all get the idea.
I'm thinking this could be a good mod for a tele. During landing, the brake is deployed (either partially or fully), reducing lift and increasing drag. The aileron would have reduced effectiveness.
During normal flight, the flap would be flush with the bottom the wing, generating little drag (except for the hinges, servo, and the small gaps around it) And the ailerons would have full effect.
Your thoughts???
_____________________________
“It is possible to fly without motors, but not without knowledge and skill." - Wilbur Wright
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
quote:
ORIGINAL: algutkin
I am interested in selling the Telemaster, however the actual shipping cost might be a deal breaker.
First, let me take the plane down, clean it up, post some pictures, measure it for shipping, and then I would be interested in talking to anyone that might want to buy it.
Give me some time to accomplish all this stuff as I still work, also we are going away for a long weekend. In addition I am presently finishing up two other projects that have build threads on the other major site, RCgroups, in the conversion forum , under the name of scalefan.
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
quote:
ORIGINAL: vmsguy
I've been reading this thread (actually read through it several times) and I've been undecided about adding flaps or not. In another thread, it was suggested flaperons weren't really a good idea.
But back to "to flap or not to flap." One discussion talked about how adding flaps reduced the aileron area, and hence the agility.
So I came up with the following idea.
Ailerons would be built as normal, the length of the wing. The servos controlling them would be a ways out on the wing.
Air brakes, (at least I call them air-brakes) would be added to the bottom of the wings nearest the center. These air brakes would be about 10 inches along, and controlled by the "flaps" servos.
I included the picture below. The first is a typical wing profile without the airbrakes. The second is with the airbrake installed, but in the "tucked in" position. And the third is with the airbrake deployed. I saw the hinge idea on another thread somewhere, I can't remember where. It's two control horns, one on the wing, the other on the flap, but connected together in the farthest hole. I liked the hinge idea for its simplicity of execution.
The scale isn't perfect, but I think y'all get the idea.
I'm thinking this could be a good mod for a tele. During landing, the brake is deployed (either partially or fully), reducing lift and increasing drag. The aileron would have reduced effectiveness.
During normal flight, the flap would be flush with the bottom the wing, generating little drag (except for the hinges, servo, and the small gaps around it) And the ailerons would have full effect.
Your thoughts???
I think your idea will work great but make sure you use good servos. With those deployed it's going to put a good load on your RX pack so make sure you have one in good condition.
I do wish that my STM had flaps but I have gotten use to the float and simply adjust with a longer final. If I were to do it I would tear the covering off and modify the wing structure for barn door flaps and aleirons.
Posts: 65
Joined: 10/25/2004 From: Kilgore,
TX, USA Status: offline
well gentlemen, I went and sold my original STM and ordered a rtf STM! I have gotten it almost ready for the maiden flight (waiting for my new radio) I went ahead and put the flaps on it by splitting the ailerons (original) and adding the extra servo into the outer wing. I found that the extra 2 servo mounts inside were almost a perfect fit between the wing spars and epoxy'd in so slick and flush that I assumed thats what they were meant for. Anyway, motor and esc from UH is quite impressive mounted very nicely. For now I'm gonna' start out with a 4200mah battery pack to trim and set up with go from there. It balances out right in the middle of the balance range and I expect very few problems for the mauden flight. Will come back later...Jerry
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
Wow this thread has been quiet for a while! I decided to strip the covering off my STM to redo it and to make more modifications. I plan on making the ailerons bigger (wider) by about double and to add flaps of the same size. I'm also planning on adding a tow release and a hatch on the top of the bird to allow loading of my current bomb bay.
NOTE: BE REALLY CAREFUL WITH THE TAIL!!! The factory uses the side sheeting for most of the structure and mine was cracked on both sides at the top. I could have had a major structural failure during flight.
Posts: 333
Joined: 12/13/2001 From: Snohomish,
WA, USA Status: offline
Mike and all,
I added some 1/64th ply sheeting at the aft end of my fuselage, as I had heard the tail is weak. All Telemasters have a "wobbly tail" to begin, so adding sheeting is a good idea for more stiffness, too.
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
Attached are the pictures of the cracked tail. I really can't believe that I didn't have a major failure during my snap rolls. You can see that there is a small gap and that's only with the weight of the tail on it. I need to get to the hobby store to get some supplies to reinforce things and to make my mods.
RCU!!!! Even shrinking the file down 85% it still says the file is to large. Sorry guys. I'll have to change the settings on my camera.
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
I had some time over the past few nights to get some work done. The first order of business was to reinforce the tail. I needed to do that first because I had planned on making a hatch on the top to allow me to load the bomb bay without tipping the bird up which is a pain. I used some 1/4 square balsa, 1/4 square pine and some 3/32 balsa sheet to make the repairs. I also went over all of the glue joints with some CA in the tail just to make sure it was good. Next step is the wing which I want to add flaps to. I could go the easy way out and cut the ailerons but I don't think the TM has enough roll as it is so I don't want to do that. I'm thinking about removing the trailing edge of the wing and gluing that to the original aileron to make big barn door flaps and ailerons. Removing the trailing edge isn't going to be hard because there ISN"T ANY GLUE! YUP folks. If you have any reason to remove the covering do yourself a favor and re-glue everything. More pics to come as I go along. Hopefully only one more week but most likely more then that until it's done. Oh, check out my mess!!!
Posts: 272
Joined: 6/17/2005 From: San Diego, CA, USA Status: offline
Well I jumped in and cut the wing up.
First step was to pin it to the board to keep her straight. I simply cut where the trailing edge of the ribs meet the strip(if that makes sense). I then glued the original aileron to the now removed trailing edge strip and used some square balsa (1/8th) to fill the gap. Then I installed a new trailing edge strip and doubled it between the ribs to add strength. I need to sand a bit and fill some spots but it's all there. I also need to figure out how I'm going to bevel the edge without sanding though.
Posts: 1
Joined: 8/23/2007 From: Sandy, UT, USA Status: offline
Quick question.
I am building my STM now with an AXI 4130. My question is, does the firewall built into the fuse already have the correct thrust angles? So I just mount the motor at those same angles?
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RE: Hobby Lobby Sr. Telemaster ARF - 
