VincentJ

Nice job on the maiden Tom, I'm sure you will be pleased with the maiden of the Kadet as well. It looks great out on the field...

David2011

My Feedback: (1)

I've tried using Randolph's general aviation dope and found it to not be fuel resistant. Even 10% nitro softened the clear Randolph's. When it got grungy I cleaned it with nail polish remover and top coated with SIG fuel proof clear. No more problems.

David

David2011

My Feedback: (1)

The only time rubber bands have given me a problem it was 100% my fault. I put the wing on a .40 sized Ugly Stik with 1 rubber band on each side, just to hold it in place and forgot to add more before flying. I saw daylight between the wing saddle and wing accompanied by a resonant WHACK when the wing luckily reseated into the saddle. Setting up for a landing immediately, the brief remainder of that flight was possibly the smoothest, most gentle flying I have ever done. I was very fortunate to have gotten away without damage.

David

TomCrump

Thanks, Vincent !

How's the new place ?

flyingagin

I used a few to few rubber bands once. Started hollering that I was getting hit (72mhz). Then I started flying much smoother and gentler. Problem went away. After landing I was told to add more rubber bands. No more problems.
But I usually build with bolt on wing in mind now.

Ken

Pork Chop

My Feedback: (5)

My instructor who taught me 30 years ago told me to use 4 on each side with half of those crisscrossing, never had a problem. He also told me about having a Tupperware container full of corn starch to put the used rubber bands in, worked like a charm. One box of rubber bands would last the whole year!

Ed

If you have trouble sleeping tonight, just watch my boring maiden video, and you'll be asleep in minutes. I'm doing two things here; just trimming, and checking battery capacity to see if I can exceed 10 minutes. Really exciting touch and go's at 4:20, 6:00, and 7:30 minutes on the video track. https://www.youtube.com/watch?v=PdEA...m-upload_owner

Video was taken with my Hatcam, sorry, no zoom.

Yes, it'll do about 12 minutes with reasonable throttle management. zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

Don't fall out of your chair.

Ed

TomCrump

Nice vid !

Congrats on your successful maiden.

Refresh my memory, please. What motor, esc, prop, battery combo are you using ?

Your Kadet flies much like my ARF Sport did. I know that you will enjoy yours.

BigTeeEldorado

I agree, Nice Vid....that plane obviously loves to fly....evidenced by the long landings......I'll bet the wind was out of the south!


Seriously though...very nice!

Ed

See's a sweet flier, and since I am handicapped and fly sitting down, I need to be careful that I don't doze off. The motor is a cheap, but new, Turnigy G-46, 420 KV outrunner, prop is a APC 15x8 E, ESC is a Turnigy 70A., I am using a separate 10A BEC, and the LiPo is a Zippy Compact 4S, 4000 mah. I selected the 420KV motor to turn a efficient large diameter prop and go for duration, and hence, needed to order the longer TNT landing gear for ground clearance. The RTF weight is 7 pounds.

It was all very well worth it, because I now love it. It is slow, smooth, and precise.

https://www.youtube.com/watch?v=PdEA...m-upload_owner



Ed

Hatcam >>>

TomCrump

Thanks for the info.

My "new" ARF Sport will be powered by a 32 sized motor, on 4 S with a 12X6 prop. I was hoping to maiden it, along with the yellow one, today, but it was too windy.

Pork Chop

My Feedback: (5)

Very nice Maiden Ed, thanks for sharing the video and your setup! How's the Turnigy G-46, are you happy with it?

Ed

The Turnigy G-46, 420 KV pulls like a mule. You need to be careful though, there are 3 different KV ratings available. You need to select the right one for the job that you want to perform. I selected the 420 for long flight times, in lieu of high speed performance.


Ed

Pork Chop

My Feedback: (5)

Thanks Ed, I have an old Kadet Senior I want to convert to electric so the lower Kv rating should be the right choice, more pull less speed, right? I'm new to the world of electric motors so I appreciate the info. What motor mount did you use for the Turnigy G-46?

Ed

Yes Chop's , a low KV means less RPM, but more low speed torque in order to turn a large diameter prop, which is better for slow flight. And everyone knows that large diameter props are more efficient than small diameter props , right ? Small diameter, high pitch, high RPM props just flail away and cavitate in the air, while slow turning large diameter props Move the air. The low KV motors also have more turns to their coil windings, offering higher resistance, and therefore draw less current. High KV motors, for high speed performance, have low resistance coils, draw higher current, and make for shorter flights.

My G-46, 420 KV motor came with a mount. It also comes in 670KV, and 550KV if you are so inclined.


Ed

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[TD]Turnigy G46 Brushless Outrunner 420kv (.46 Glow) (USA Warehouse)

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Designed to be a direct swap out for your .40 to .46 size glow engine. The Turnigy EasyMatch G46 brushless outrunner will provide more power and with its high efficiency, long run times.
A quality motor, built specifically for planes designed to fly with a .40 ~ .46 glow engine.
Spec.
Battery: 4~5 Cell /14.4~18.5V
RPM: 420kv
Max current: 55A
No load current: 11V/1.5A
Internal resistance: 0.032 ohm
Weight: 300g (not including connectors)
Diameter of shaft: 6mm
Dimensions: 76x50m
Test Data:
18.5v - 14x10 Prop - 40A - 2650g Thrust
18.5v - 15x8 prop - 44A - 3150g Thrust


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Pork Chop

My Feedback: (5)

Your explanation makes total sense Ed, never heard it explained that way. I think I know enough now to be dangerous!

Flight Risk

My Feedback: (1)

Here's a question to add more confusion. If the low kv motor can swing a bigger prop, can't it also swing a higher pitch prop (of smaller diameter), and get the same speed as the high kv motor?
Or, what will be more efficient/faster? A 10x8 prop at 10,000rpm on a high kv motor, or a 10x10 prop at 8,000 rpm on a low kv motor? Or use whatever numbers would seem reasonable.

Ed

" A 10x8 prop at 10,000rpm on a high kv motor, or a 10x10 prop at 8,000 rpm on a low kv motor? "

Realistically, using run of the mill motors, you are never going to reach 8,000 rpm using a 10 x10 prop on a low kv motor. For example , a 400 kv motor ; means that with no load on it, it will spin at 400 rpm per volt. So if I use a 5 cell, 18.5 v battery, 400 x 18.5 = 7,400 rpm, and that's with no load. And so, you would never come close to 8,000 rpm with a prop attached to that motor. You would need to go to a higher kv motor to get to 8,000, and that's why they make both high and low KV motors available to you . Choose wisely. You are correct, it can be confusing.

What is best when you get into electric, is to start with the manufacturers recommendations, and then get a Wattmeter. So then if you want to play around and use something other then his recommended props, you can use the Wattmeter to see that you do not exceed the Maximum Current for that motor ............... Or else you might start smelling some very expensive smoke.

Cheers -

Ed

bigtj10

My Feedback: (1)

What do you mean by Sig Brotherhood #120; Sig Kadet Brotherhood #155 etc. etc.; also are there any photos of how to make ailerons for the stock wing of the Sig Senior? I have a new wing kit but no real idea of how to make ailerons or what are referred to as barn door flaps; I seem to remember seeing photos of such but can't remember where I saw them posted?

Ed

I have been unable to edit my above posts and provide you with the correct Youtube link., The original link has changed since I shortened the video.

For what it's worth, my maiden flight shortened from 10 to 5 minutes. >>> https://www.youtube.com/watch?v=yHY8utSkQW0



Ed

TomCrump

There are "brotherhoods" dedicated to the Sig Kadet and to Sig kits in general. They are located in the kit building forum, if I remember correctly.

There should be pics of how I converted the stock Kadet Senior wing, to a barn door aileron wing, in this thread.

YellowBlueBird

Barn Door Aileron and what it might look like if it were a flap.

bigtj10

My Feedback: (1)

Goodness gracious, I have found you on the kit building boards as you said! It is funny to read everyone's stuff and know exactly how they felt when stuff went south or wherever the "bad" direction is! Does Balsa USA stock kits? I always thought they just supplied balsa around the US?

bigtj10

My Feedback: (1)

How do you know what size an ESC needs to be? 20C? 35C? 50C? too hot to handle? What is the rule? No rule?

Ed

I'd say it should be rated in amps at least 10% greater then your motors maximum allowable amps. Check your motor specs first, and then add 10%.

Ed