Show your EDF JETs...

[trailblazer]

[edmond22]

Dude,

For EDF, static thrust is not as important as Efflux velocity. You can have a lot of static thrust and still arrive at a unflyable EDF with too low a efflux velocity. The faster EDF you see around normally requires a long ROG takeoff or bungee launch due to the simple fact that it has very low static thrust for take off but good efflux velocity for good speed. The Bungee is simply meant to give it that edge to push it to the point where the fan can "bite" the air and move along.

Forget about measuring static thrust. In terms of EDF, there is very little you can do to change it (other than optimizing intake ring and inlet), you can't change the fan size, pitch etc etc. What we normally do is measure in terms of watt per pound. I found this to be more relevant to measure and get an idea of a EDF performance.

150w/lb for Fair EDF performance
200w/lb for Good EDF performance
250w/lb for Great EDF performance
300w/lb (or greater) for Extreme EDF performance

I think we discussed this in http://www.daddyhobby.com/forum/show...ght=watt+pound

So beyond watt per pound, you can look at "squeezing" your FSA exhaust 85-90% for more efflux velocity (more speed and less static thrust).

Read about FSA, intake and outlet

http://www.parkjets.com/building/2010/2/19/what-is-fsa-for-edf-lovers.html

Dun worry about Static thrust, for EDF, that is really not important, just important enough to reasonably get you to handlaunch (your f18 etc) or bungee or ROG. After it get to speed, it doesn't matter anymore unless you plan on slowing down so much for high alpha aerobatics (leave that to 3D planes)

[trailblazer]

Very true.

Initial power tests before my maiden - my dad held it vertical and I punched the stick full... other EDFs would sink down.. this one doesn't..

And don't worry. I have not forgotten the efflux velocity lecture

The most important lesson I learnt though, was to set dual rates for my maiden flights. I crashed not because of speed, but control surface sensitivity.

[trailblazer]

finally got a clamp meter (temporary)

229w/lb

[GlenLCH]

My first EDF

[trailblazer]

My first EDF

That, my friend.. is SWEETNESS!!

[hoorey]

bae hawk t45

attualy i am new to edf.
this is my 2nd ( my dream jet )
my setup:
1) edf unit - red velocity metal special 4300kv
2) x power eac 60amp
3) 3 unit turnigy 9g servo
4) 4s 2200mah 25c turnigy " nano tenology"
5) 9c radio + frsky 2.4ghz

due to high kv motor,i set timing to LOW.
,








forme it very fast,can fly 6min with throttle managment.
i like the sound of edf ,

my next project :buy 90mm bae hawk T45( fiberglass)

[kirakun]

My first EDF

Swee. I like it. May I noe the where u get the sqn color, logo n sing logo? Thx.

[f22]

T45

attualy i am new to edf.
this is my 2nd ( my dream jet )
my setup:
1) edf unit - red velocity metal special 4300kv
2) x power eac 60amp
3) 3 unit turnigy 9g servo
4) 4s 2200mah 25c turnigy " nano tenology"
5) 9c radio + frsky 2.4ghz

due to high kv motor,i set timing to LOW.
,[ATTACH]96838[/ATTACH]

[ATTACH]96839[/ATTACH]

[ATTACH]96840[/ATTACH]

[ATTACH]96841[/ATTACH]

[ATTACH]96842[/ATTACH]
forme it very fast,can fly 6min with throttle managment.
i like the sound of edf ,

my next project :buy 90mm bae hawk T45( fiberglass)

Bro, try this, you will like it...

[GlenLCH]

Swee. I like it. May I noe the where u get the sqn color, logo n sing logo? Thx.

Got it with the plane from Aerosmith.

[trailblazer]

F-86

Mine too.. a lil used already lol

[hoorey]

t45

Bro, try this, you will like it...

nice!!!how much the cost?

[f22]

T45

nice!!!how much the cost?

kit is around S$280..

[Ben33]

Nice Alfa Model F86...
Where did you get yours from?


Ben

a pic of my old F-86 sabre.

Cheers
TB

[tboltsg]

Nice Alfa Model F86...
Where did you get yours from?


Ben

Got it from HK online. I think SHS carry them locally, can check with them.

Hope this helps

Cheers
TB