Helis & Planes Compared

[dubehigh]

19000 is that metric hrs l.o.l or is it solar powerd OR a highbread

yea it should be fun. i think it will be here sat. and sat nite i will report back with the crash damage ;D

[BTCat]

I can read the headline now: Man Keeps It Up 15 hours" ;D

[akent]

The indoor ultralight guys are a secrative bunch, at least they were in the old days.
Elasticity, ultra light unobtainium, prop math that would blind most folks.
Those folks are almost beyond rocket science!!
Kent

[BTCat]

Mar 2, 2010 20:41:50 GMT -6 akent said:

The indoor ultralight guys are a secrative bunch, at least they were in the old days.
Elasticity, ultra light unobtainium, prop math that would blind most folks.
Those folks are almost beyond rocket science!!
Kent

It would be interesting, but can you imagine their videos on Youtube. It might be as exciting as watching a dust ball after an hour or two ;D

Wonder what they do while their planes are floating around? If they sit and drink beer Dube is going to join them. Maybe hang his by a string and down a few dozen ;D

[19000rpm]

Endurance flying is just what some guys are all about. When the hobby first started the real challenge was keeping the damn things in the air for more than 30 seconds so endurance flying became a big part of the hobby.

One of the guys I fly with at the school, he's 78, used to be an outdoor endurance flier in the .049 class. He won one championship, but they never found his plane. It was going out of sight as he broke the record; giving new meaning to the line, "Win some lose some." ;D ;D

[BTCat]

Mar 3, 2010 7:15:18 GMT -6 19000rpm said:

Endurance flying is just what some guys are all about. When the hobby first started the real challenge was keeping the damn things in the air for more than 30 seconds so endurance flying became a big part of the hobby.

One of the guys I fly with at the school, he's 78, used to be an outdoor endurance flier in the .049 class. He won one championship, but they never found his plane. It was going out of sight as he broke the record; giving new meaning to the line, "Win some lose some." ;D ;D

The Irony just cracks me up!

[19000rpm]

This is a repeat, but I think it's worth repeating: As Rodney Dangerfield once said, "Irony can be very ironic." ;D ;D

[BTCat]

Almost got all the brushless stuff on the cub. I can't find a 9-7.5 prop at any of the LHS though. What would be a good alternative?

I am impressed with that Turnigy motor so far. Nice look and feel (or "fit and finish" as some would say). I spooled it up yesterday on the bench. It is super smooth. Not the slightest vibration even at 100%. It feels like it has some kahonas too ;D

I'll probably post pics in the plank section when I get done.

[19000rpm]

The 9x7.5 I suggested is a Parkzone prop for the Corsair and T28 so I'm a little surprised that your LHS doesn't have it.

I'd try an APC 10X7 first and, depending on how you like the performance, speed vs/thrust, try a 10X6 and a 10X8.

The Turnigy's are hard to beat for the money. You almost never hear of a failure unless it's been severely damaged in a crash.

[BTCat]

The 9x7.5 would be the faster of the ones you mentioned, correct? I might buy two or three types to see what I am able to handle. Slower would be better right now, I assume.

BTW, one LHS doesn't carry much PKZ stuff. The other place does, but when I asked about the 9x7.5 we looked on his regular prop display. I think he might have more in his PKZ area. I'll check sometime this week.

Thanks for all your help 19k! You are a wealth of knowledge.

[19000rpm]

Mar 7, 2010 14:32:07 GMT -6 BTCat said:

The 9x7.5 would be the faster of the ones you mentioned, correct? I might buy two or three types to see what I am able to handle. Slower would be better right now, I assume.

BTW, one LHS doesn't carry much PKZ stuff. The other place does, but when I asked about the 9x7.5 we looked on his regular prop display. I think he might have more in his PKZ area. I'll check sometime this week.

Thanks for all your help 19k! You are a wealth of knowledge.

You're welcome BT.

Good idea to check the PKZ area since they have their own line of props just for their planes and you don't generally find them with the APC or MAS prop displays.

The 10X7 or 10X8 should be plenty fast too. Like I said, your turnigy has a lot of power and you'll just need to experiment with propping. It'd be a good idea to monitor your ESC (40A?) to make sure a particular prop isn't over heating it. Generally speaking; the lower the second number on the prop the more Amps you'll draw. Check it with an Amp meter too.

[akent]

Generally speaking; the lower the second number on the prop the more Amps you'll draw.

Are you sure you don't maybe have this backwards?

First number = diameter.
Second number = pitch.

Higher pitch means more speed and motor load/current draw.
Kent

[19000rpm]

Mar 9, 2010 18:54:30 GMT -6 akent said:

Generally speaking; the lower the second number on the prop the more Amps you'll draw.

Are you sure you don't maybe have this backwards?

First number = diameter.
Second number = pitch.

Higher pitch means more speed and motor load/current draw.
Kent

Yep, you're right Kent, I had the pitch part backwards. Some times I read my posts and wonder who typed that silly thing. ;D

OK, here's a revison/addition: The second number, pitch, represents the number of inches the prop will pull forward per 360 degrees of rotation in a perfect world. An 8 pitch would move forward 8 inches in one 360 degree rotation.

That doesn't mean that the plane will go faster though. The higher the pitch for a given prop diameter the more "thrust" is generated as opposed to additional "speed".

Kind of like gearing in a car. The higher the final drive gearing number the more thrust and the lower the gear number the higher speed.

Lot's of other things to consider when propping too, like motor, ESC, battery and AUW, to mention a few, but if you've got a good base prop, for a given plane, then you can work on it from there to make it have unlimited vertical thrust or top end speed.

Now, I hope I don't read this post later and regret typing it.

[akent]

I sure wish there was a calculator that would say, "Humm, you want that foamie to go 220 mph? Ok, use this motor, this ESC, this battery, and that helmet."

[19000rpm]

Mar 10, 2010 20:23:48 GMT -6 akent said:

I sure wish there was a calculator that would say, "Humm, you want that foamie to go 220 mph? Ok, use this motor, this ESC, this battery, and that helmet."

My "calculator" is to watch somebody do something insane and then I "calculate" backwards...Which reminds me; have you tried the Grayson combo out on the F22 yet? ;D