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Turbines vs EDF

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Old 12-12-2013 | 02:41 PM
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Originally Posted by Dr Honda
If you don't fly AMA... then it doesn't matter.


BUT, I don't understand all the negative comments I hear about the waiver. It's not that hard to get, and it doesn't cost anything extra. If you are a good pilot... you go to your local CD, and you fly a few times... get a signature, and send in the paperwork.

It's just a way to be safe, and keep your insurance.
My guess is that the majority of pilots against the wavier... aren't good enough to do all the maneuvers.
Old 12-12-2013 | 05:39 PM
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Originally Posted by tulz161
My guess is that the majority of pilots against the wavier... aren't good enough to do all the maneuvers.
That's the thing.... There aren't any "Textbook" maneuvers to do. It's not like you have to study for a driving test, and practice parallel parking. You just have to show competence. And since this is hobby related, that means going to a flying site, and having a good time, by .... FLYING !!
Old 12-12-2013 | 05:59 PM
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I'll say it took me a month to get both people required at the flying field for me to get my waiver, I glad I got it because at the time I was only in my 2 year of flying and it shut up all those freaking bench poilts who never fly but act like there the -- you know
Old 12-13-2013 | 05:07 AM
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Originally Posted by mikes68charger
I'll say it took me a month to get both people required at the flying field for me to get my waiver, I glad I got it because at the time I was only in my 2 year of flying and it shut up all those freaking bench poilts who never fly but act like there the -- you know
Yep... but you got to fly, and have fun. AND... it's an accomplishment that makes you feel good. Right?

I had to travel to a field that was about an hour away... and I had to go 4 times. But, I got to fly, and meet a new group of guys.


You comments about the "Bench Pilots" is funny. There is a group of them at every club I've belonged to. Personally... I'm about half way on that. There have been times where I'm just not "Feeling it"... so I tinker, and don't fly. But there are other days where I get 10~12 flights in.


Mike... I noticed that engine sold... did you get it?
Old 12-13-2013 | 05:26 AM
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I wish he said someone put a bid in 10min after it posted. I just figured out how to set the fourms up to email me every time someone post a turbine for sale.

I have been thinking I wanted a 22 pounder but I know in my hart I want a skymaster f15 and the 22 pounder any going to work so I would rather get a 24-30 pounder and turn it down
Old 12-13-2013 | 06:00 AM
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Originally Posted by mikes68charger
I wish he said someone put a bid in 10min after it posted. I just figured out how to set the fourms up to email me every time someone post a turbine for sale.

I have been thinking I wanted a 22 pounder but I know in my hart I want a skymaster f15 and the 22 pounder any going to work so I would rather get a 24-30 pounder and turn it down
When looking at the older turbines... generally, the engines in the upper 20's are just hotter versions of low 20# engines. A good example is RAM. The 750 was originally, 17#. the 750+ was 22#, and the 1000 was 28#. Then Carlos turned it up to 30#. (all the same engine, with updates)

With the more modern engines.... the 22 Lb engines are SAMLL !!!! Some companies got the "54" sized engines turned up to 100N. (like Wren, and Jet Central)


The Gripen you just got can hold a "Larger" engine. So, it would be to your benefit to buy a large engine, and turn the thrust down to match the air-frame, so you can move it to your F-15 later.
Old 12-13-2013 | 09:02 AM
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Originally Posted by mikes68charger
Hey guys not sure were to ask this question but I'm having 2nd thoughts on my original plan. I'm restoring a Byron F16 I just got done fiberglassing the wings ,etc moved the servos into the wing and rudder

I was going to use the byron fan with a Jet Screamer motor on 12s with a Castle 160amp ESC
well my motor showed up this weekend and the motor (not the fan etc) weighs almost 3 pounds!
and I was told I will pull around 130amps at 17pounds thrust.

But I also have an old AMT 180 pumped to 17.5 pounds sitting around,

So I know turbines have a lot of eflux but electrics are supposed to be lighter but in this case I think this heavy edf will be close to the weight of the AMT

so anyone ever convert there large EDF to turbin or the other way around?

what are your thoughts?

thanks
I fly both and have done a number of large EDF conversions and can tell you that not all airframes are suitable for EDF conversion. IMO the Byron F-16 is not a great airframe for conversion because with the cheater hole and lack of good ducting, it is has too much drag. Will it fly as an EDF? Sure. But your flight times will be short and you will be hard pressed to get jet like performance such as large loops and good verticals. Some of the keys to successful EDF conversions are a low drag, efficient airframe, good ducting (unless you are using a Schubeler HST fan that was designed to operate in an open ducted environment), and top shelf batteries. With an efficient airframe, good ducting, and top shelf batteries you can get up to 6 minute flight times. If you are looking for longer flight times, then a turbine is the way to go.

In the end, this is a hobby meant to bring enjoyment. No matter the opinions of others (myself included), do what brings you the most enjoyment.

Kirk
Old 12-13-2013 | 01:43 PM
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I own a Byron f16 I have had since 1980 the best engine I have used is a Rossi 81 with a bit of port work and a Byron tuned pipe 5 % nitro fuel plane came in a bit over 12 lbs fueled , not the fastest jet for sure but the most forgiving and slowest landing plane I have ever flown except maybe a spacewalker.......118 mph was as fast as I could get her to go but could fly circles around most at the club, keep it light as possible , it is a great airframe for pleasure flying and she's kinda pretty too.

Last edited by f16man; 12-13-2013 at 01:45 PM.
Old 12-13-2013 | 02:33 PM
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Originally Posted by f16man
I own a Byron f16 I have had since 1980 the best engine I have used is a Rossi 81 with a bit of port work and a Byron tuned pipe 5 % nitro fuel plane came in a bit over 12 lbs fueled , not the fastest jet for sure but the most forgiving and slowest landing plane I have ever flown except maybe a spacewalker.......118 mph was as fast as I could get her to go but could fly circles around most at the club, keep it light as possible , it is a great airframe for pleasure flying and she's kinda pretty too.
I've always wondered how flyer's figure out how fast their plane is going. With my electric prop planes I can use pitch of the prop and rpm's to get a rough idea of how fast it should go or how fast it is actually going. How do you figure that out with a jet? Do you have some type of radar? Or maybe an on-board data device?

Thanks
-oD
Old 12-13-2013 | 02:42 PM
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I know when mine are going fast enough when at least 2 guys in the pits get scarred.
Old 12-13-2013 | 02:51 PM
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Originally Posted by mikes68charger
I know when mine are going fast enough when at least 2 guys in the pits get scarred.
Right - it's easy to sneak up on the runway real quiet like, kinda low, then bank right or left to show the top of the wing, and jam the throttle wide open. The sound/sight can scare the beejesus out of somebody if they're not expecting it.
Old 12-13-2013 | 02:58 PM
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Originally Posted by oliveDrab
I've always wondered how flyer's figure out how fast their plane is going. With my electric prop planes I can use pitch of the prop and rpm's to get a rough idea of how fast it should go or how fast it is actually going. How do you figure that out with a jet? Do you have some type of radar? Or maybe an on-board data device?

Thanks
-oD
There's several iPhone apps that use the Doppler effect to measure speed. Do a search in the App Store and you'll find them. They say they're pretty accurate.

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