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Old Nov 07, 2014, 11:20 AM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
Build Log
Starmax F-14 70mm twin pusher prop

So I'm not all that good at pausing my build to take pictures but I'm going to do my best. With that said my F-14 (this model) started out as a Twin 70mm EDF that was 90% built from the starmax Kit version. I wasn't happy with it and needed to take a fresh restart to it. After flying my 6mmflyrc F-14 with a single pusher prop I decided to tear it down and put twin pusher props in it.

So here is the rub.
5 x 12g emax MG analog servos.
2 x slim digital wing Corona 22g servos
I can't remember the wing swing servo but it's huge and heavy.
2 x FMS 90 deg rotating V3 retracts for mains ( the same ones I've installed in my Corsair)
I don't have my nose gear installed yet.
Motors
I'm still messing with finding the right combo. I want to stick with the 45A ESC's and 4's Right now I'm testing three motors and different props out to get the most Thrust for my bang. I would like a total of more than 4000g's of thrust.
but need around 3500g's for the min performance I'm looking for.
I'm calculating my AUW to be 2600g's
I have:
2 x 2836 1400kv's and 2 2836 1800kv's and might get 2 x 2836 2300kv's
Props I'm trying are 7x6x2, 7x5x2, 6x5.5x2 and 6x4x3.


This will be my first Taranis plus design build. Right now I have my X8r installed but I have already decided to switch that for a X6r and the use of a decoder. So I'll have 10 Ch's to work with.

Channel break out:
1 Thr
2 Ail
3 Elv
4 Rud
5 Gear
6 BEC

Sbus
7 (decoder 1) right wing control surface
8 (decoder 2) Left wing control surface
9 (decoder 3) Wing swing servo
10 (decoder 4) Orgx Stabilizer on/off

OrgX Stabillizer set as Delta wing
input
Ail = X6r ch2
Elv = X6r ch3
Rud = X6r ch4
Aux = X6r ch10

outputs

Ail = right Taileron
Elv = Left Taileron
Rud = Rudder


I will post my eep when I have it all dialed in .

Here is my basic sequence.

Wings full open, Tailerons (elevators acting like elevators and Ailerons) and
spoilerons function, unless SB is in either ^ or v position.
If SB^ 25% flaps with flaperon control ( Takeoff Flaps) . If SBv 75% Flaps
with flaperon control (landing Flaps).

Wings less than +75 open, Spoiler/Flaperons (main Wing control surfaces) are
centered and do not function.
When wings are
less than +30 open, Elevators achange from
40%expo to 45% and
Taileron change from 75%
throws to 50% and 40%expo to 75%expo.

Wings swing back during flight with gear up and SA- or SAv. SA- + thr > roughly 60%, SAv + thr > roughly 30%.

I also add two extras.
Taxi mode is when I'm taxing and want the wings back for a smaller profile.
Gear down + Thr < 50% SFV (thr lock unlocked) flaps in normal position (SB-) and hold SHV for more than 7 seconds. It will stay like this until you release SHv

Storage mode.
When SF^ = SE^ and hold SHv for 7 seconds the gear goes up and the wings go back. It's hold this for 25 seconds. Enough time for me to get my batter pack unplugged.

Thanks
Gravy
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Old Nov 07, 2014, 04:33 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
Here is a quick video of the workings.
Starmax 70mm F-14 build 1 (4 min 32 sec)
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Old Nov 11, 2014, 02:36 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
I got my program all worked out (preflight anyway) and thought I would add some custom call-outs to my Taranis Plus.

Playing with my Taranis plus F-14 style (3 min 8 sec)


It's getting close to flight ready.
I'm just waiting on some ESC to motor extension leads and finish up some prop motor thrust test to figure out exactly which ones to use.

Gravy
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Old Dec 03, 2014, 01:03 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
If all goes well this Saturday will be maiden flight time.
Taxi run F-14 (0 min 54 sec)


I have twin NTM 2836 2300kv's with 6X4 APC's, 45A ESC's on a twin 4s 2450 packs.
It was pulling 88A with 1200 watts at WOT.
AUW is over 5lbs. I did a quick thrust test (Held plane vertical and had friend throttle up plane) it wanted to jump out of my hands when I let go of it. In the video when I burp it in the video, that was only 25% throttle.

Gravy
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Old Dec 03, 2014, 07:41 PM
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RPatrick's Avatar
Hurst, Texas USA
Joined Jan 2002
709 Posts
Hey Gravy !

Nice to see your project in the final stages. Looks like an exceptional F-14 complete with landing gear and plenty of power. Best of luck to you on your maiden flight !

RPatrick
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Old Dec 08, 2014, 12:07 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
Thanks.
It didn't happen this weekend. As we were going pre-flight and taxing we noticed something was off. As it got up to speed it taxied fine but when you backed off it would turn left or right.
what we found.
First the front strut had some slop in the shock shaft. so we put a set screw in to just hold it into place. That got a little better.
Next we found I had not put all 4 screws into my main gear. I had only the back two in place per side and the front was not tightened down.
Also as we looked it over we realized that putting the nut to the wing pivot bolt under the bottom frame with a washer instead of under the swing wing bar will strengthen the wings as well as that part of the frame. So I took it home and made some tweaks and finished my gear install.

I am so glad we didn't just go for it. It would have taken off and flown but the landing would have been a killer.


This is what happens when partially build something before you put it away for a week.
What I mean is. I have my kids every other week. So the week I have them I store my build away and when I don't have them I pull it out to work on it. So I know that As a stopping point one week I "tacked" the gear in. Then came back to it a week later and paid no attention to the gear thinking I was done. So I need to step up my game on leaving build completion notes to myself.

Gravy
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Old Dec 11, 2014, 01:15 AM
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Joined Feb 2010
422 Posts
Hey Hey!

Nice build there.

Love the solution with the edf/mount!

Awesome.
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Old Dec 11, 2014, 04:19 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
Thanks

I can't wait to get this bird off the ground and back safely. I want to start building my EDF version, but not until I have this one flying and Landing good.

Gravy
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Old Dec 29, 2014, 07:30 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
So Here it is, She flies.
The F-14 takes off finally (4 min 14 sec)
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Old Dec 29, 2014, 08:08 PM
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RPatrick's Avatar
Hurst, Texas USA
Joined Jan 2002
709 Posts
Congratulations !

It is great to see a twin prop pusher using landing gear so effectively. Awesome takeoff and landing !

Thanks for sharing the video Gravy !

RPatrick
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Old Jan 04, 2015, 08:41 PM
Fly,Crash, Burn,Fix, repeat
Gravythe Clown's Avatar
United States, CA, Fresno
Joined Dec 2013
463 Posts
So I flew my F-14 today. Man this thing is great and so stable. The only thing I will change will be the props. I'm going from 2 6X4 APC's to 2 5.5.X4.5 APC's. Only because I tipped the ground on take off.
Now I'm really excited about getting my 70mm EDF one up.

I am also posting my eepe in case someone wants to use it.

Gravy
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