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| Electric Flight Discuss Electric Flight in Canada |
Topic Review (Newest First)
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| 10-14-2012 10:43 AM | ||
| Ralph Day |
Re: cog for Kadet LT40 First flight went well. Added some more weights due to lots of down elevator trim. Later added one washer to each of the top engine mount fasteners giving the motor some down thrust (not excessive). The next flight will tell if it's done the trick. It would be nice to remove 2oz of lead if the down thrust has solved the problem...washers are much lighter. Lost of fun flying a forgiving airframe. Gusts of wind wiggled it instead of pitching it up or down several feet (foam Fun Cub, Hobbyzone Champ are my other planes). Ralph |
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| 10-12-2012 04:33 AM | ||
| ss40a |
Re: cog for Kadet LT40 We used peel and stick the other day and upon landing they were nowhere to be found.. Obviously the CG changed in flight! Not the best weights to use. |
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| 10-11-2012 06:06 PM | ||
| moo |
Re: cog for Kadet LT40 Quote:
http://home.comcast.net/~boeingeagle...of_gravity.pdf |
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| 10-10-2012 04:30 PM | ||
| Ralph Day |
Re: cog for Kadet LT40 Got the cog zeroed in as much as one can by themselves. I had to add 4 1/4oz weights to the nose (1 oz in total) to get the 3.5" cog. They are the peel and stick type, easy to remove (hopefully not easy to lose). Ralph |
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| 10-10-2012 03:07 PM | ||
| Dave Holmes |
Re: cog for Kadet LT40 Quote:
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| 10-10-2012 01:47 PM | ||
| Ralph Day |
Re: cog for Kadet LT40 Thanks everyone! I'll start with the beginner 3.5inches aft of the leading edge and see what happens (will be on buddy box... so it's not my fault!) I found some old glue. Trying to remove the battery from it's velcro spot pulled the mid floor (old site of fuel tank) right off the walls of the fuse. A few grams of triangle balsa, some door skin ply and gorrilla glue should fix that from happening again. Ralph 12 rubber bands? I didn't figure that many in my weight calculations for the power supply  . Better to fly a little heavy than have the wing detach and not fly at all.
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| 10-10-2012 10:16 AM | ||
| atc666 |
Re: cog for Kadet LT40 According to the manual on Sig's website it should be 3.5 to 4.25 inches back from the leading edge. http://sigmfg.com/cgi-bin/dpsmart.ex...FV5.html?E+Sig Google is your friend. |
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| 10-10-2012 10:14 AM | ||
| aceplant00 |
Re: cog for Kadet LT40 from sigs website 232. Attach the wing to the fuselage with twelve #67 rubber bands, six per side. 233. Familiarize yourself with the balance range shown on fuselage side view plan. Three possible balance points are represented in this range, and your KADET-40 will behave differently in flight at each of these three balance points. You should choose the balance point that fits your experience level. Distance Aft Of Wing L.E. Inches % Of Wing Chord 3-1/2" 27% 3-7/8" 30% 4-1/4" 33% . 3-1/2", 27% THE BEST BALANCE POINT FOR BEGINNERS! At this balance point the KADET LT-40 will have its best trainer qualities! It will be super stable in flight and will have strong "hands off, self correcting" tendencies. If this is your first R/C airplane, we strongly recommend that you use this balance point! 3-7/8", 30% A good middle of the road balance point for modelers who already know how to fly R/C, or for beginners who have progressed far enough that they no longer get disoriented and loose control. The KADET LT-40 will still be perfectly stable, but it won’t return to level flight quite as quickly as it would at the forward balance point. 4-1/4", 33% THIS BALANCE POINT IS DEFINITELY NOT RECOMMENDED FOR BEGINNERS! The most rearward balance point is only recommended for experienced fliers who want the most aerobatic performance they can get out of a high-wing trainer. This balance point, in conjunction with increased control surface throws, will enable the KADET LT-40 to do advanced aerobatics like spins and snap rolls. With this balance point, the KADET LT-40 takes a long time to self correct. 234. Using a ruler, measure back from the leading edge of the wing to the balance point you want to use (3-1/2" for beginners). Make a pencil mark at this point on the bottom of the wing, next to the fuselage. Make the same mark on the other side of the fuselage. 235. Place a fingertip on each pencil mark and lift the airplane up in the air. No part of the model should be touching anything except your fingertips! If the KADET LT-40 will sit on your fingertips in a level or very slightly nose down attitude, then it is properly balanced and ready to fly. 236. If the airplane sits on your fingertips in an extreme nose down attitude, then it is nose heavy. You will have to add weight to the rear of the airplane to get it to balance. NOTE: Before adding additional weight to the model, try simply moving the battery pack to a further aft location. The battery pack is relatively heavy and therefore makes a good balancing tool. You might try switching places between the battery and receiver; or move the battery right in front of the servos; or in extreme situations, move it behind the servos. If you can’t get your model balanced simply by re-locating the battery pack, then you will have to purchase lead weights from your hobby dealer and glue them into the tail end of the fuselage. 237. If the airplane sits on your fingertips with the tail down, it is tail heavy. DO NOT ATTEMPT TO FLY IT! A tail heavy model is very dangerous and will most likely crash!! Lead weight will have to be added to the nose of the model to bring it into balance. The weights can be glued to the inside of the fuselage "cheeks" in front of the firewall; or inside the fuselage alongside the fuel tank. There are also "spinner weights" available for tail heavy models. Wherever you put the balancing weight, make sure it cannot loose in flight! If you ever change any major components in your KADET LT-40, such as the engine, muffler, battery pack, etc., be sure to re-balance the model! |
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| 10-10-2012 10:12 AM | ||
| tallone66 |
Re: cog for Kadet LT40 Main spar, or slightly forward and you will be golden. Derrick |
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| 10-10-2012 10:06 AM | ||
| Cricklewood |
Re: cog for Kadet LT40 I put mine at the main spar and found that it flew well there. |
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