~~Sig Kadet Brotherhood~~.
#1227
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Join Date: Jun 2009
Location: LaGrange,
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There's also the LST 1/2A Trainer on RCU here: http://www.rcuniverse.com/forum/1-2-...a-trainer.html and there's also the Kadetito which can be found with a search in the Hip Pocket Aeronautics plans gallery. Don't know how either of them actually compare to the Sig kits, but they look nice to me.
Ken, I've seen posts in various places, mostly RC Groups, to a "Micro Kadet" that flies with .049 but as far as I know SIG didn't put it out, it's an independent creation.
Just now, I managed to find a thread on a micro build - http://www.rcgroups.com/forums/showthread.php?t=1626520
Just now, I managed to find a thread on a micro build - http://www.rcgroups.com/forums/showthread.php?t=1626520
#1228
soarrich, No just the opposite. The nacelles were built to have a parallel thrust line to the original single engine setup and the same 6 degrees of downthrust.
In a twin you also want outthrust, so there is 4 degrees of outthrust on each engine as well. To complicate the setup just a little more I wanted the mufflers and spinners both centered on the nacelles so the engines are turned but centered on the firewall differently on each side because of that outthrust. Here is a couple pictures that might help.
In a twin you also want outthrust, so there is 4 degrees of outthrust on each engine as well. To complicate the setup just a little more I wanted the mufflers and spinners both centered on the nacelles so the engines are turned but centered on the firewall differently on each side because of that outthrust. Here is a couple pictures that might help.
Ken
#1229
I just figured the downthrust should be the same as designed into the kit so I took that from the plans and it turns out it could have been a touch more (climbs at full throttle). The outthrust I decided on after reading as many of these types of forum post as possible and it was just about perfect I think. As far as centering, that was done the good ole eyeball way and I just barely had enough room in the nacelles.
I can tell you have done this cause you appreciate all the different degrees that almost left me comatose when I was figuring out the nacelles. Thanks for the understanding/sympathy
#1230
BigTeeEldorado When I made my first attempts (failed horribly) I went online and tried to teach myself enough trig to figure out the offsets. Fried a bunch of brain cells and failed badly. All total I spent a week finding a method that for me works 100%. So I just stick to it from now on. If I could have figured out the math, I would have created a spreadsheet in Excel to do it from now own, so I would not have to do the math again and again, since I am mostly a scratch builder. And if it aint from scratch then I am modding the heck out of it anyway.
Ken
Ken
#1231
A man after my own heart. I haven't built a kit in the last, oh lets say 30 years, that I did'n make some kind of "IMPROVEMENT". Envy you your patience to be able to stick build, I have great respect for that talent. Without exception, all my current flying models are from either a restoration, or something given to me from the island of misfit toys, or from a Kit that I "Improved" or some experiment in foam electrics. At the very least and it has been said of me that I only get interested when it is unusual, but I NEVER leave well enough alone. It's a recognised flaw
#1233
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Join Date: Feb 2002
Location: The Villages, Florida NJ
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Engine thrust angles.
From watching the video I thought that's what you had done. The down-thrust on a high-winger is there to keep the nose from coming up because the center of drag is above the center of thrust. With a high-wing twin and with the thrust line above the center of drag you want up-thrust, your thrust line seems to be on the center of the drag so you may get away with 0° up or down thrust. The down- thrust was why you had all that high-speed taxing in the beginning of the video. I'm assuming that your fix was lots of up elevator trim?
#1234
That's good-lookin' work that you've got there Kevin - nicely done. Did I see that right - a Kavalier sitting next to her? You've picked a great plane to act as follow-up. I had a guy that I taught to fly here a couple years ago that built a Kav as a basic trainer, had it toned right down to the point that she was very docile on the controls. As he picked up experience he simply up'd the sensitivity on the controls, until he had her right up to the best she could do. Was quite impressive to watch the two of them growing together.
Hey! Y'er not yet in the B'hood - #157'sall yours if you want it.
#1235
From watching the video I thought that's what you had done. The down-thrust on a high-winger is there to keep the nose from coming up because the center of drag is above the center of thrust. With a high-wing twin and with the thrust line above the center of drag you want up-thrust, your thrust line seems to be on the center of the drag so you may get away with 0° up or down thrust. The down- thrust was why you had all that high-speed taxing in the beginning of the video. I'm assuming that your fix was lots of up elevator trim?
I totally get your point though and to answer your question I have never had to feed in any up trim. In fact as I mentioned because it climbs on full power I usually fly with a good amount of down trim. I ran out to the garage after reading your question, turned on the radio and plane and took these pictures which is the trim setting from the last time I flew it.
I think there are too many additional aerodynamic factors in play here to focus on one and say it is the reason a modified kit does or does not do something. For the record though I did not change the wing or tail incidence or size or shape. I did take out all dihedral but did not build in any washout and the plane is balance to the same CG point.
My thought process in the build was that this is a big flat bottom wing that is going to produce more lift the faster it goes and downthrust will help counter that. I get your center of drag point and your probably right cause this is actually the first time I have discussed that as a reason for the downthrust in the first place and it makes total sense. I was just wanting to not create more variables in the modification and keep as much of the design factors the same as I could cause the single engine version flys so good. As I type this I am applying your input to different characteristics on this plane and others I have and going "Oh Ya...of course"
Whether it turns out I am a really fart smeller or just a happy coincidence, it all works very well. I appreciate your question cause I just learned a new thought concept for future mods and I thank you for the knowledge factor. I hope my input benefits you as well.
#1236
That's good-lookin' work that you've got there Kevin - nicely done. Did I see that right - a Kavalier sitting next to her? You've picked a great plane to act as follow-up. I had a guy that I taught to fly here a couple years ago that built a Kav as a basic trainer, had it toned right down to the point that she was very docile on the controls. As he picked up experience he simply up'd the sensitivity on the controls, until he had her right up to the best she could do. Was quite impressive to watch the two of them growing together.
Hey! Y'er not yet in the B'hood - #157'sall yours if you want it.
Yes that is a Kavalier next to the Kadet and both are at the same building stage right now . The Kadet will be covered soon and hopefully flying by next week and the Kavalier should be finished in a few weeks and ready to fly when I am ready . Then it will be fall before I start on a 1/4 scale Cub kit that's driving me crazy to get at it but I need a larger work space before that happens .
I love all the pics and information here about the Kadets and when I did a search on making mine a tail dragger most of the info came from RC Universe
Here is another shot of the Kavalier and the Kadet together.
#1237
I am considering having my wife and daughter build an LT-25 for themselves. I have a Power 25 setup that should work nicely in it, and they can cover it in what ever colors they want, like Pink and Purple. I think by building it they will be more attuned to flying it rather than crashing it. I thought about an LT-40, but then I would have to get another motor for it, and having the power 25's just sitting around doing nothing, the LT-25 is a better option. My wife got real excited when we went to the Sig flyin and is eager to learn how to fly. She thought it was a blast even though it rained all day.
#1238
My wife likes to watch, but flying is out of the question, for some medical reasons. She has no interest in building, but loves to be around when I am building. She will hold a part for a picture or the plane for me to post on the several sites I am on.
She is my exterior decorator. She does 90% of my color schemes for me.
Ken
She is my exterior decorator. She does 90% of my color schemes for me.
Ken
#1239
Join Date: Dec 2010
Location: Burleson,
TX
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I just finished a new Kadet LT-25. I haven't flown it yet. I used a new Magnum 25 for power. I am really impressed with how smooth running this engine is. I hope to fly it this weekend.
#1240
Nice job on the LT25, I like the color too.
#1241
looking great ! Very nice work .
good luck on your maiden flight and hope to see some pics
#1244
ZOR!!! Haven't seen ya around in an AGE!!! How y'doing?
#1246
Banned
This post may be out of topic but deserves an answer.
skylark-flier and FlyerinOKC, ( in the order of the posts )
I am doing fine for a very old man.
Recently, about three months ago, I got interested in helicopters and have spent hobby time in that domain.
I found very little postings from heli fliers.
This being spring time I had to give priority to many household ( property ) chores that resulted in very little hobby time. I hope to find more time soon.
Many thanks for your question.
Zor
I am doing fine for a very old man.
Recently, about three months ago, I got interested in helicopters and have spent hobby time in that domain.
I found very little postings from heli fliers.
This being spring time I had to give priority to many household ( property ) chores that resulted in very little hobby time. I hope to find more time soon.
Many thanks for your question.
Zor
#1247
I am doing fine for a very old man. ... Recently, about three months ago, I got interested in helicopters and have spent hobby time in that domain.
I found very little postings from heli fliers. ... This being spring time I had to give priority to many household ( property ) chores that resulted in very little hobby time. I hope to find more time soon. ... Many thanks for your question.
I found very little postings from heli fliers. ... This being spring time I had to give priority to many household ( property ) chores that resulted in very little hobby time. I hope to find more time soon. ... Many thanks for your question.
I've been known to grab a plane when my wife picks up a mop. I've been known to grab SEVERAL planes when she heads to the garden.
...
We won't talk about the vacuum cleaner.
Hey! Heli's are great!! I'll never own/fly one, but I like watching them perform - especially at the hands of someone who is decently proficient.
Hang in there man, summer truly is coming (at least, according to my horses).
#1248
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Join Date: Oct 2007
Location: Bo Thong, Thong Saen Khan, Uttaradit Province, THAILAND
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#1249
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Location: Bo Thong, Thong Saen Khan, Uttaradit Province, THAILAND
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Marty