Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

F-20 Tigershark.

Old 07-25-2008, 09:31 PM
  #1  
Angler-Hi
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Default F-20 Tigershark.

This will be my next EDF jet:
http://www.rc-warbirds.com/product_i...roducts_id/344

I'll be going with this drive set:
http://www.rc-warbirds.com/product_i...roducts_id/669

I plan to order her by the end of the month. I'll be using a bungee launcher (10kg) pull. This will be my first fiberglass/balsa EDF. I'll be using a 4s 2200mah li-po from HobbyCity. What do you guys think about the powerplant I plan on putting in her? I wanna get as many thoughts and opinions as I can before I place my order. Thanks.
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Old 07-25-2008, 09:54 PM
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Old Fart
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I have the exact setup - flies nice. No real issues with the kit - there's a pretty good sized build thread on RCG you'll want to read. IIRC, you want to hold off on installing the horiz stab until later than the instructions show. 2200mah isn't going to give you much flight time - I was running 4S/4200 mah

Wish I'd had it on 2.4 gHZ though (this was the last of my 72 mHZ glitches)
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Old 07-25-2008, 11:42 PM
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Dang, sorry to hear that friend. I thought I might need a higher mah rating. Sounds good.

Did you use 3 servos for this bird? Also, how fast is she with this setup? Did you use a bungee or hand launch? What flight times were you getting with that battery? Sorry for all the questions, just curious. I'll be using my DX7 to fly her.

Mike

Last edited by Angler-Hi; 07-26-2008 at 02:14 AM.
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Old 07-26-2008, 12:29 AM
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You're a sick man. I remember it wasn't that long ago when you first started asking about RC.
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Old 07-26-2008, 01:42 AM
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Firestem4
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I saw that plane on www.nitroplanes.com its a beautiful kit and i really wanna get into EDF's but i also want a nice, high quality kit. I saw this thing. on sale for $99. I might get it. And i might ccheck out that typhoon power set that is linked in your post too Angler. Good deal and not such a bad price. We'll see. =)

Last edited by Firestem4; 07-27-2008 at 06:03 AM.
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Old 07-26-2008, 02:06 AM
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max2112
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Smile Rock on!!

Two words Mike:

AWESOME!!

&

SUBSCRIBED!!

Good to see you home safe, buddy.
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Old 07-26-2008, 02:19 AM
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Thanks John. I'll be ordering her on the 1st. I can't wait. Hopefully I'll have her built and ready for maiden before we leave for NTC. It'll be pushing it, but that's what I'm shootin for.
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Old 07-26-2008, 02:20 AM
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Originally Posted by Angler-Hi View Post
Dang, sorry to hear that friend. I thought I might need a higher mah rating. Sounds good.

Did you use 3 servos for this bird? Also, how fast is she with this setup? Did you use a bungee or hand launch? What flight times were you getting with that battery? Sorry for all the questions, just curious. I'll be using my DX7 to fly her.

Mike
3 servos, HS-125's in each wing, HS-81MG (now HS-82MG) in the tail. No rudder.

Maybe a really seriously athletic "20 something" could hand launch - I bungee'd. Will probably rebuild (if I ever get it back from rvincent)

If not - guts are going in a Hobby People F-16.

It was probably a 100-110 mph bird, maybe faster.
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Old 07-26-2008, 02:49 AM
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Thanks Old Fart!! Yeah, she seems kind of a big bird to try and hand launch. What kind of bungee did you use? Did you use a ramp system, or just the bungee itself with a pedal, coming straight across level ground? I really appreciate all the help!!

Mike
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Old 07-26-2008, 02:50 AM
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Originally Posted by FlyingMonkey View Post
You're a sick man. I remember it wasn't that long ago when you first started asking about RC.
I know, right? It's yalls fault. People like you FM are the reason I ever made it this far.
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Old 07-26-2008, 02:51 AM
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don't go blaming me... unless you want to send me a plane in thanks
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Old 07-26-2008, 02:56 AM
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Originally Posted by flyingmonkey View Post
don't go blaming me... Unless you want to send me a plane in thanks :d
lol:q.
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Old 07-26-2008, 03:04 AM
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Originally Posted by Angler-Hi View Post
Thanks Old Fart!! Yeah, she seems kind of a big bird to try and hand launch. What kind of bungee did you use? Did you use a ramp system, or just the bungee itself with a pedal, coming straight across level ground? I really appreciate all the help!!

Mike
Basically used a sailplane hi-start - what we had on hand. No ramp (although if I rebuild this burd I'll build a PVC ramp) - just pointed her nose up about 30 degrees and let her rip.
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Old 07-26-2008, 03:52 AM
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What's a sailplane hi-start? I'm confused when you say bungee...pointed her 30 degrees up...no ramp?
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Old 07-26-2008, 12:26 PM
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Hi-starts are lengths of surgical tubing, tied to a longer length of string. You walk, with your plane connected to one end, the other end anchored to the ground, stretching the cord. Then hand launch your plane upward.
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Old 07-26-2008, 04:35 PM
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Originally Posted by FlyingMonkey View Post
Hi-starts are lengths of surgical tubing, tied to a longer length of string. You walk, with your plane connected to one end, the other end anchored to the ground, stretching the cord. Then hand launch your plane upward.
Thanks FM. I think I know what you're saying. How do you hand launch if it's attached to the bungee/hi-start? Wouldn't it snag your hand...how does it release from your plane?
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Old 07-27-2008, 03:39 AM
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you hold on tight, then let it go in an upward arc.

as it reaches the top of the arc, you dip the nose down, the little ring (did I forget to mention the little ring on the end of the end of the high start?) will slide off the little hook (yeah, forgot to mention that too. you have a hook on the plane) and away you go...
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Old 07-27-2008, 04:38 AM
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Thanks Fred.
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Old 07-27-2008, 05:22 AM
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Old 07-27-2008, 10:00 AM
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Originally Posted by FlyingMonkey View Post
You're a sick man. I remember it wasn't that long ago when you first started asking about RC.
YEA, I Agree with Flying Monkey , Your Having way to much Fun Mike Take care, Chellie
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Old 07-27-2008, 12:19 PM
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the het f20 is a great model. mine is powered on 6s lifepo4 cells, with a hacker b40 8l, wemotec mf 480 and hextronic 120A regulator.
it does 1:1 power/weight ratio, and with a slipstream in excess of 240 mph, its pretty fast too. unfortunately, i havent gotten to test it very much yet, as i just bought a 2 meter wingspan composite extra 330, wich im playing with these days.
anyway, the f20 is a great kit. there was only one thing annoying about it, and that was that there is no exhaust pipe supplied in the kit, to use between the fan and the nozzle. i made mine from beer can aluminium and double sided tape. works great, and its lightweight too.
you probably need a catapult for it, as its short stubby wings dont give too much lift at low speeds. especially not if you are going to weight it down with a humungous power system.
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Old 07-27-2008, 02:51 PM
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Thanks Moxus. It seems like you have one heck of a powerplant in her! There's no doubt that I will need a catapult/bungee of some type. I'm going with the recommended powerplant from RC Warbirds. Thanks a million for all the info. Let me know when you get her up again...maybe some video
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Old 07-27-2008, 02:52 PM
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Originally Posted by CHELLIE View Post
YEA, I Agree with Flying Monkey , Your Having way to much Fun Mike Take care, Chellie
I can't help it Chellie
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Old 07-27-2008, 03:01 PM
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Originally Posted by CHELLIE View Post
YEA, I Agree with Flying Monkey , Your Having way to much Fun Mike Take care, Chellie
That is the point of all of this. Isn't it?
Anyway, for me it is.

Paul
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