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Old Oct 21, 2012, 12:00 PM
Microbiology at it's best.
beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
244 Posts
We have the technology to rebuild

A pic of the motor mount that I wanted to use but I measured wrong. It is strong enough to handle a much bigger motor than the one that you can see.

Also, here is the glider needing some TLC after the Kadet is finished.

My HURC order should be here tomorrow.
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Old Oct 21, 2012, 05:03 PM
charliey0
United States, WA, Oak Harbor
Joined Apr 2012
1 Posts
Gents, please excuse my butting in. One day I'll get to the Kadet Sr, but for now it's the LT-25. This comes with a .25 - .30 2Stroke, but I want electric. What engine? How much watts? Best motor - prop - battery combo ? Would really appreciate help
Charliey0
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Old Oct 21, 2012, 05:53 PM
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scirocco's Avatar
Australia, ACT, Kambah
Joined Feb 2001
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Quote:
Originally Posted by charliey0 View Post
Gents, please excuse my butting in. One day I'll get to the Kadet Sr, but for now it's the LT-25. This comes with a .25 - .30 2Stroke, but I want electric. What engine? How much watts? Best motor - prop - battery combo ? Would really appreciate help
Charliey0
Hi Charliey0, how about you start a new thread for this one and then I'll drown you in info. My LT-25, beside a favourite flyer has also been a power system testbed from mild to wild.
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Old Oct 22, 2012, 10:52 AM
Microbiology at it's best.
beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
244 Posts
Quote:
Originally Posted by charliey0 View Post
Gents, please excuse my butting in. One day I'll get to the Kadet Sr, but for now it's the LT-25. This comes with a .25 - .30 2Stroke, but I want electric. What engine? How much watts? Best motor - prop - battery combo ? Would really appreciate help
Charliey0
Hey Charliey0, it is OK to join in. This is my first conversion from a slimer to electric and I am learning as I go. There has been a wealth of info provided to me by many fine folks on this thread. My Kadet should be in the mid to lower range for sport power running an E-max 43 at 720 watts WTO. Sig stated at least 500 watts for a Senior and I think I have a Lt-40 or someting close since mine is over 10 yrs old. Who knows, maybe it is an early version of a Senior since it has a 70 inch WS and the Lt-40 was only recently introduced.

I like scirocco's idea of you starting a your own thread. The info will be dedicated to your goal. I will be waiting to see what comes about.

Terry
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Old Oct 22, 2012, 03:29 PM
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beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
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Direct from Sig

Here is the reply from Sig Mfg.

"Sounds like an LT-40. That's the only Kadet we've ever had with a 70" wingspan. The LT-40 kit version has been out for over 20 years. The ARF version was out for about 6 years, then off the market for two, and now reintroduced a couple years ago.

Best regards,
Mike"


Now I can sleep at night.
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Old Oct 22, 2012, 06:25 PM
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Australia, ACT, Kambah
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I was researching .40 sized ARFs last night for anothert thread, and noticed that the current vesrion of the LT-40 is the "LT-40 EG" for electric or gas. Although I'm surprised Sig recommends a motor with Kv=1000 @500W, which suggests 3S for a 12 or 13" prop, or maybe 4S and an 11" prop. I'd always recommend for a model that big 4S minimum and Kv nearer 800- 900, or my personal favorite of Kv around 400-500 and smallish 6S packs.

Comparing it with the competition such as the Nexstar EP or the Alpha .40, I think you'd be hard pressed to find a better choice than the LT-40 with its signficantly lower wingloading - a key feature IMO for a trainer.

@Terry - now it's confirmed it is an LT-40, have you thought about editing the thread title?
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Old Oct 22, 2012, 09:25 PM
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victoria texas
Joined Jul 2003
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Ditto, LT40 is a great all around model. The big wings will enable you to select from a wider range of motors. One thing that i would look at would be prop clearance. look at the maximum prop size you could mount and still clear the ground. A motor that uses a 16 inch prop aint gonna do ya any good if it hits.
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Old Oct 22, 2012, 09:29 PM
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victoria texas
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and if ya' really like small motors, just get them in bulk....
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Old Oct 23, 2012, 08:42 AM
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beerbrewer's Avatar
Waverly, Nebr.
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Quote:
Originally Posted by scirocco View Post

@Terry - now it's confirmed it is an LT-40, have you thought about editing the thread title?
Awesome idea so I did it.
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Old Nov 05, 2012, 05:09 PM
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beerbrewer's Avatar
Waverly, Nebr.
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I know that I have read something about raising the back of the wing about 3/8 inch (or 10 mm) but I have not figured out why. One person said that it would give about 3 degres of downward thrust. If that is built into the firewall in the beginning, why would I need more?

Not much has moved on the conversion since my last post. I did get in the batteries and charger in so I have cycled them twice between balanced full charge to balanced storage charge. I know what I want to do for the mount but I need a new front wheel assembly so I can get the height correct. More on that later if I build in a new LG mounting block to raise the plane up another inch for spinning a larger prop.

I went to the overpriced LHS to pick up a few items and it appears that they are moving away from aircraft and parts. I hate to place a card order for such a small cash value but if I can't get it locally, I will have to. They will sell you a land buggy or other toy and they have increased the amount of floor space for "gaming" for all of you D'n'D freaks.

Uc2, I can see putting 4 blue wonders on the LE of those glider wings I have. What is the airframe that you have the 4 on?

Terry
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Old Nov 06, 2012, 09:03 PM
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victoria texas
Joined Jul 2003
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I dunno what plane it is, got it from a friend who got it at a swap.

The twin Kadet sr was test flown sunday.....excellent! flew very straight and honest.
Frankly, I was amazed things went so smoothly. Sorry no pics yet. I can't fly it and
take pictures at the same time. Somebody took a vid and i will threaten the club
members till they cough it up.
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Old Nov 14, 2012, 04:49 PM
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beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
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Another order

Well I just placed another for what I had hoped for the last of the stuff I need. All I can say is mercy, it looks like everybody is wanting the exact same items from HURC as I. There is a bunch of what I want that is out of stock so I won't be ordering any extras. At least I have a watt meter coming and plenty of parts to keep me busy over the Turkey Day Break next week.

I have been so busy at work that I have had very little time for any "government" project. I do have the motor mount and firewall cut out but need to get it glued up. I also found out the hard way that basswood realy likes to split right down the grain. I should have everything ready to install the motor by Friday if they don't throw a bunch extra on me at work.

I will get pics up on my next post.
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Old Nov 17, 2012, 10:53 AM
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beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
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I have finished the new motor mount and I am very pleased with the way it has turned out. All of the screws thread in easily by hand and it puts the weight forward by about 2 inches. If I remember correctly, I pulled out 5 ounces of lead fishing weights that were directly behind the firewall. This setup will eliminate having to add any extra weight and allow me to swing a big prop. My first try for the mount put the motor too low.

My next hurdle is to figure out the battery hatch and air flow over the ESC. I will try to get that figured out over the holiday. With my watt meter arriving early next week, this baby may be flying before Christmas.

I also need to contact Sig Mfg.Co. for the correct angle or line when the plane is sitting on the ground. I picked up the new front landing gear yesterday so that I could finish the new mount assembly. I just need to get it positioned correctly in regards to height.
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Old Nov 17, 2012, 03:12 PM
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Australia, ACT, Kambah
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IF they used the same method as their the LT-25, the correct thrust angle is built into the firewall alignment. It's worked fine for me across varying power systems
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Old Nov 18, 2012, 12:10 PM
Microbiology at it's best.
beerbrewer's Avatar
Waverly, Nebr.
Joined Apr 2009
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Hey there scirocco,

I am not concerned about the thrust angle for the new mount since that angle has not changed. For the mount I just made it so the prop sits out in front of the cowling. I made sure that it was parallel to the original so the firewall is only moved 2 inches forward.

The line or angle I am referring to is how the bottom of the fuse and wing lines up with the ground. I do not have the original front landing gear and the new one tends to put the tail down way low, (IMHO). With a 12 inch prop I have just over 2 inches clearance between it and the ground. The new mount raises the center line of the motor about 1 1/4 inches above the original slimer so I can swing a bigger prop. The nose just seems too high in relation to the tail. It could be just the way the motor is mounted causing an illusion. I need to mount the wing and see what the actual angle of that line is.

I do have a pair of wire main LG that is about 1 1/2 inches taller. They came off of a Midwest Aero-Star 40 that I built years ago with used electronic parts. The poor thing did not survive its maiden voyage. I don't know what went horribly wrong, but it went straight down from about 100 feet up at near full throttle. I suspect either the tx and rx was the cause since they were used. The engine was buried at least 1 foot in a cornfield. I saved what I could and threw the balsa kindling in the trash. Anyway one of the LG wires are slightly twisted but can be straightened.
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