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Sig kadet lt 40 build . And a flaps idea

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Sig kadet lt 40 build . And a flaps idea

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Old 09-24-2017, 06:20 PM
  #1  
Mwt5086
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Default Sig kadet lt 40 build . And a flaps idea

Hey guys, first time posting but ive been reading on here for a very long time . I've finally got around to building my dog kadet lt 40 and while all i wanna do is fly the darn thing I just can't seem to stop overcomplicating things lol .. I've converted her to a tail dragger , added a bayonet and two wing bolts . Swapped out the tail feather stock for spruce and adding two out board aieleron servos and some flaps (modified the trailing edge too so that me flaps are closer to wing root ).

I only have but two questions . What do you guys thing about using the rudder stock for inboard flaps ?

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also what do you guys think about ngh 17 as power source? I know kinda overkill but I figure I can buzz around 1/4 throttle and sip fuel till I figure out how to make it hover

ok fine 3 questions .. for the outboard Aileron servos do you thing some hitec 9 gram servos will cut the mustard ? (Hitec hs 65-hb plus) they have carbonite gears.Click image for larger version

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Last edited by Mwt5086; 09-24-2017 at 06:23 PM. Reason: Misspelling
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Old 09-25-2017, 03:47 PM
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Murphey
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As a “Recovering Over-Builder”, I've had several love affairs with the LT-40, the tail dragger mod on the LT-40 is a worthy mod…had great results doing mine.The 17cc NGH is a bit on the over powered side, but not much.Regarding the tail feathers, the main thing to look at is how the vertical fin is attached to the horizontal stab…this is a weak point.I would use Hitech 225’s instead 65’s.And finally, to the flaps…I put flaps on one of mine (again…recovering Over Builder) and found it was more trouble than it was worth.Properly balanced the plane will land at a low groundspeed and has plenty of lift with that big wing.I will agree that building in flaps is fun and fun to experiment with them on landings but they only need to be the same as the aileron stock.These are just my thoughts…the Sweet LT-40 is forgiving and will take a lot before telling you it’s too much!Enjoy your build!
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Old 09-25-2017, 04:06 PM
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flyboy2610
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I'm currently building a Great Planes PT-60 ( https://www.rcgroups.com/forums/show...t-Planes-PT-60 ) and I put flaps on it. I just cut the aileron stock for the flaps. On that plane, the ailerons are 28" long. I cut them so the aileron section is 10" long and the flaps are 18" long. Most of the 'work' done by a strip aileron is in the outer 1/4-1/3 anyway, so that should be sufficient. I figure if it needs more authority I'll just increase the throw a bit.
But to reiterate: for the flaps just cut the aileron stock.
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Old 10-02-2017, 01:56 PM
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Murphey thanks so much for the servo suggestion .. overbuilding this thing has really taken a toll on me and the servo selection part of my mind is not working .. I followed every bit of your advice on the servos and ignored alot else haha .. this lt 40 is just too much fun to mod .. I like the idea of beefing up the tail feathers but I might try and make them bolt on maybe ? Still pining over how to do this but anywho there has been progress on the wing . I finished the bayonet lug and mounted the two Aileron servos . Finished the top sheeting and got all the control surfaces mounted and aligned best I could . Should I go ball joint to clevis on the Ailerons ya think ?
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ID:	2234901flyby thanks for the Aileron suggestion..i ended up going with Sig stock Ailerons that were a 1/2 inch wider .
Also picked up this baby on let go . Got the hog bipe a brand new dx6i and and old cub for 250 .. the hog bipe is pretty much rtf. Just gotta add some fuel and get a glow igniter Click image for larger version

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Old 10-02-2017, 04:33 PM
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Looks pretty obvious to me that you need another place to store planes. That Hog can stay in my garage, indefinitely and rent free
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Old 10-02-2017, 09:45 PM
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Hydro junkie I may have to take you up on some free hangar space if I don't slow myself down haha .... in my haste I realized I didn't fully do my hw on this plane .. it's actually a Sig Smith Smith miniplane . Still was a greatdeal and honestly the work someone did on it just blew me away . I got a mystery yellow cub with the deal that I might throw some servos in .. I'm not sure who makes it but it def needs some tlc haha

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someone had an interesting landing
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Old 10-12-2017, 06:35 PM
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Ngh 17 engine mock up .. had to modify the front hatch a bit but overall not too too bad of a fit ... toyed with the idea of inverting it but the throttle linkage lines up almost too good this way .. if this thing isn't a glider /banner towing work horse I dk what is .

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Old 10-13-2017, 03:11 PM
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I have one of those LT 40's and it's getting a new wider fuselage for a Magnum XLS 60 and tail dragger legs, the plane is a floater so the thought of flaps never came up, could be fun thow. I like performance, something the 47 don't have. I'm not sure the wing will hold up jerking it around up there so may have to add a wing tube to them, anyway have fun with your's, I hope to with mine.

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Old 10-30-2017, 04:16 PM
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Well guys she's pretty much there .. just dialing the engine in to get the lowest idle i can .. might have to limit throttle to 1/2 for the first few flights to make sure I don't rip the wings off .. Tail dragger mod was a through fuselage type and handles beautifully.. had to add 0 weight with cg 3.75 inches back from wing leading edge (both batteries were mounted all the way back in the fuselage) haven't weighed her yet but I'm sure she is a porker .. hope to maiden this weekend Click image for larger version

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Old 10-30-2017, 07:00 PM
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Just remember, what you dial it in at while at home will probably be different than what it will run at while at the field. Temperature and humidity will play hell with a needle setting so I wouldn't worry too much about getting it dialed in until you get to the field
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Old 11-01-2017, 12:00 PM
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I have mine as a tail dragging bolt down, but my dihedral is no more than an inch vs the 3 1/2" stock. Mine does not come in slow with an FG-11 4 stroke gas on it. One day I had a dead stick and it came in so long that I actually wound up having to flat turn it to land on the main runway, then take a long walk to retrieve it. Flaps might slow it down enough for me, but I tend to like how it flies with almost no dihedral. Flies nice upside down too. First plane I built back in 2011, and still flies nice, getting a bit worn, with loose ailerons, and decals starting to peel, but still a fun plane to toss around the sky.
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Old 11-01-2017, 12:50 PM
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Yes I'm learning alot about high low settings playing with it in my driveway .. as for flaps I'm hoping that the addition of 1/2 inch to the Aileron and flap stock as well as the ability to crow will help slow this pig down for a reasonable landing ... if flaps prove to add to much lift I'll mix in more up Aileron to act as a spoiler and less flap . We shall see
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Old 11-01-2017, 12:53 PM
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Accdi I like the no dihedral ... i was considering building another wing for it and maybe clipping it one one or two bays and eliminating dihedral .. I've even toyed with the idea of flipping the laser cut joiner over and building in anhedral .. at 70 bucks for the wing kit if she survives a few flights another wing is definitely in my future
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Old 11-01-2017, 03:02 PM
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Nice build, looks great. Let us know when you maiden it.
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Old 11-02-2017, 05:29 PM
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ID:	2243379First high speed taxi runs today . Tail lifts off the ground at about 2 plane lengths at half throttle .. lotta rudder needed to counter act torque but isn't a problem for gradual run up to speed .. second high speed run got her a little floaty and realized eagle tree guardian is stabilizing in reverse . Dipped a wing and ground looped when plane tried to counteract left wing droop in wrong direction .
luckily no damage to prop or wing . Quick adjustment of the individual gain pots and had the gyro working correctly .
also added some beefier tires for a better prop clearance and a tail wire kit .
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Old 11-02-2017, 05:32 PM
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Also I apologize if the picture quality is lacking it looks fuzzy after I post it to me but looks lerfect before i submit .and I can't post it urls till I hit 10 posts lol all pics and more are up on imgur . My username is miketez9
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Old 11-02-2017, 05:58 PM
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Those "monster" tires make it look a bit like a "bush" pilot's Piper Cub and no, that's not a bad thing
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Old 11-03-2017, 09:54 AM
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Try to get a video of the maiden if you can. I would love to see this bird fly!
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Old 11-04-2017, 01:10 PM
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Got her maiden in this morning ... at 9 lbs watching her lift off the ground really put a smile on my face ... had a guy Keith from my club do the maiden and he noticed some kind of interference at the low end of rpm right near idle , leading to serious Aileron and throttle spasms at landing .. any ideas ? Might be radio interference or vibration induced
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Old 11-04-2017, 01:10 PM
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[img]Modified Sig kadet lt 40 maiden landing https://imgur.com/gallery/YVcsi[/img][img]Modified Sig kadet lt 40 maiden landing https://imgur.com/gallery/YVcsi[/img]
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Old 11-04-2017, 03:20 PM
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More than likely picking up interference from the ignition. Move the RX as far away as possible. What radio system are you using, 2.4GHz? DSMx FHSS?
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Old 11-04-2017, 05:27 PM
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Ignition is on its own battery circuit with its own manual on off .. a radio operated optically isolated kill switch is run from the ignition to receiver .. receiver battery is in back of compartment next to receiver and ignition is under fuel tank in front with the ignition batter , optically isolated switch , and both manual switches mounted one on top of each other on the right side of forward fuse.
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Old 11-05-2017, 06:49 AM
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If you are using a metal pushrod for the throttle, you may want to replace it, that can cause interference as experienced with low frequency vibrations. Either use a throttle cable or use a nyrod. Also verify that neither antenna is near any metal including servo leads. I usually mount mine against the side of the fuse with one facing vertical and the other horizontal. Made the mistake of doing it a different way and nearly lost the plane to interference.
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Old 11-05-2017, 06:53 AM
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Roger that accdii..i am using a metal pushrod for throttle connection .. I will see about switching it today .. I will double check my antennas as well .. what is a best practice for mounting the antennas.. tape ?
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Old 11-05-2017, 07:03 AM
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I use scrap tubing that comes with the smaller pushrod, or throttle cable. Cut two 1" pieces and glue them in place, then feed the ends of the antenna through them and placed in such a way that the metal portion is sticking just past the open ends.

I will see if I can get a picture later today, the LT is in my trailer.
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