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Old Oct 08, 2012, 09:44 PM
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Roanoke, VA
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Originally Posted by viper1216 View Post
Well, I madened the Duke today. All I can say is....Wow. Had 3 flights on it. Take off from the grass was very smooth and it got right up. Didn't even use a quarter of the runway. Once airborn, it required about 2 clicks of up elevator and 4 clicks left aileron and it was trimmed. It was a little breezy and she bounced a little, but not a big deal. First landing was beautiful. Landed with about quarter flaps and it was perfect. Slowed it down just enough and touch down was nice and smooth. Second flight just as nice. Kinda screwed the second landing though, slowed it down a little to much and dropped the left wing. A little cartwheel. Right retract broke out. It came out clean in one piece attached to a wooden block. A little 5 minute epoxy and you'd never know it came out. 3rd flight I wanted to test it a bit. Up high and slow and brought out full flaps. I was at a little under half throttlle. Slowed way down, stalled and dropped out of the sky. Easy recovery, some power and nose down and she pulled right out, but had I been landing it would have been toast. Careful with the flaps. Greased the landing. I love this plane!! Flight time on the 2200's was 5 minutes and batteries were at 17%.
Overall good to hear. Sorry about the gear mess up, but at least it was not a total.
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Old Oct 08, 2012, 09:45 PM
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Roanoke, VA
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Originally Posted by viper1216 View Post
One other odd thing that happened on the first takeoff. I punched the throttle, it spooled up for about 2 seconds and then shut-down. The speed controller beeped a few times like it does when you first plug it in. After that it was fine. Someopne told me it may be because I punched it to full throttle to fast. After that I just brought it up nice and smooth and it never happened again. Could have just been a fluke, but just a heads up if anyone else experiences it.
You could have forced an Over current shutdown of the controller if you hit it too hard too fast. Rare, but can happen. Slow even throttle will make it last longer anyway.
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Old Oct 08, 2012, 10:12 PM
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United States, RI, West Warwick
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You could have forced an Over current shutdown of the controller if you hit it too hard too fast. Rare, but can happen. Slow even throttle will make it last longer anyway.
Yeah, figured it was something like that. I only punched because I thought it was going to have issues in the grass. After that, I went nice and smooth. BTW, the canopy held pretty good with just that clip. I may throw a couple of magnets in as well, just for security. Second flight I didn't move the the motor wires enough when I put the canopy on so it was not a good fit and it popped up mid-flight. Still stayed on the fuse though.
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Old Oct 09, 2012, 05:58 AM
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Originally Posted by viper1216 View Post
Yeah, figured it was something like that. I only punched because I thought it was going to have issues in the grass. After that, I went nice and smooth. BTW, the canopy held pretty good with just that clip. I may throw a couple of magnets in as well, just for security. Second flight I didn't move the the motor wires enough when I put the canopy on so it was not a good fit and it popped up mid-flight. Still stayed on the fuse though.
My clip broke before the first flight. ;(
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Old Oct 09, 2012, 08:09 AM
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My clip broke before the first flight. ;(
Bummer! Yeah, not the best design I've ever seen.
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Old Oct 09, 2012, 06:24 PM
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Bummer! Yeah, not the best design I've ever seen.
LOL.... hate to say I told you so... But....

Here it comes...

Hope You are ready...


"Told You So!"
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Old Oct 09, 2012, 07:18 PM
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Lol...actually it held. It was my fault for not putting the wires in correctly. It was fine for the third flight. I'm going to add the magnets just for a little insurance.
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Old Oct 09, 2012, 08:02 PM
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Just put a parashoot on underside of canopy. If it falls off your pilots will survive
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Old Oct 09, 2012, 08:53 PM
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Roanoke, VA
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Just put a parashoot on underside of canopy. If it falls off your pilots will survive
LOL, was going to do the same thing.... My only concern is to make sure it doesn't grab the tail on the way out...
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Old Oct 14, 2012, 02:38 AM
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Mexico, BC, Mexicali
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What is the wing loading o wing area?

I need to calculate the best motor for this model.


Manuel V.
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Old Oct 14, 2012, 03:43 AM
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Roanoke, VA
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What is the wing loading o wing area?

I need to calculate the best motor for this model.


Manuel V.
I will have to calculate that. I am just starting a 3 day (12hr day) work week. Will see if I can get you an answer Wed. Sorry for the delay
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Old Oct 19, 2012, 11:33 AM
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I will have to calculate that. I am just starting a 3 day (12hr day) work week. Will see if I can get you an answer Wed. Sorry for the delay
I have data.

Wing area, 388-390 Sq In.
To 89Oz has a Stall speed: 21MPH.
For 2.5 stall speed Model speed is necessary:

With APC 10x7, 9540rpm. for 377 watts In.X2. 273 Watts out., around 26A.
2 Short Motors, around 100 grams, 844 Kv.
4s2650, 3000, 3300ma.
2 ESC 30 to 35A.

I think in this motor.
http://www.hobbyking.com/hobbyking/s...dProduct=18647


Manuel V.
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Old Oct 19, 2012, 11:43 AM
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Roanoke, VA
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Originally Posted by manuel v View Post
I have data.

Wing area, 388-390 Sq In.
To 89Oz has a Stall speed: 21MPH.
For 2.5 stall speed Model speed is necessary:

With APC 10x7, 9540rpm. for 377 watts In.X2. 273 Watts out., around 26A.
2 Short Motors, around 100 grams, 844 Kv.
4s2650, 3000, 3300ma.
2 ESC 30 to 35A.

I think in this motor.
http://www.hobbyking.com/hobbyking/s...dProduct=18647


Manuel V.
I am not sure that one will work... Note: test Prop: 12x6 11.1v 27A 1600g. there is a person who states that they are using a 14.4 with a 40 ESC, so it may be fine, but would hate to see you burn up a pair of motors. Normally with HK if their motor will support 4S they will state it clearly.
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Old Oct 19, 2012, 01:06 PM
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check review for this motor.

http://www.rcgroups.com/forums/showthread.php?t=1488419

http://www.rcgroups.com/forums/showt...highlight=4023

This motor weighs 107 grams.
Use it to 377 watts represents 3.52 watts / g.
A 4s is possible without much heating occurs, since the efficiency will be about 73%.

More conservative would put a 9x7 or 9.5x7 prop.
give us slightly more rpm and consume slightly less amps.

The motor manufacturer recommends, plus it can not find it is lighter, about 85 grams and 900 kv.

Manuel V.
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Old Oct 19, 2012, 02:20 PM
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Roanoke, VA
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Originally Posted by manuel v View Post
check review for this motor.

http://www.rcgroups.com/forums/showthread.php?t=1488419

http://www.rcgroups.com/forums/showt...highlight=4023

This motor weighs 107 grams.
Use it to 377 watts represents 3.52 watts / g.
A 4s is possible without much heating occurs, since the efficiency will be about 73%.

More conservative would put a 9x7 or 9.5x7 prop.
give us slightly more rpm and consume slightly less amps.

The motor manufacturer recommends, plus it can not find it is lighter, about 85 grams and 900 kv.

Manuel V.

Good deal... Let me know how it works out. Others may be able to go that route.
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