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Old Jul 12, 2012, 07:46 AM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
Has anybody tried or just though about to cut out the air-inlet and air-outlet of the big under wing coolers?

I think they will produce a lot of resistance to the under wing airflow. The pitch moment should be to small to have any influence, but the airflow resistance...?
On top of this the flow distortion w.r.t. the split flap might be less after cutting out the peaces.

What do you guys think?
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Old Jul 12, 2012, 10:21 AM
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The43rdHammer's Avatar
United Kingdom
Joined May 2010
382 Posts
I've not noticed an adverse effect on my Seafire if I'm honest and i'm not sure you wouldn't rip the cooler away from the wing with an inlet-outlet.

IMHO there's no need to retrofit the cooler. I did airbrush the front of mine black though
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Old Jul 25, 2012, 01:59 PM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
I made it!!!

My 1st and 2nd flight yesterday evening with the Seafire.
Wow, what a brillant aircraft.
Just 2 clicks for roll trim and one for pitch.
I felt comfortable from the very first moment on.
Rock steady during low passes with some bank angle. And yes, I did the V-Roll at the end of our field.

I did not glue the underwing coolers and gun doms (so far).
Weight is now 4.5 kg (160gr lead) with 8s/4000 on Hacker A50 14L V2 (300kv), turning a Xoar wooden 15x10.

I will add some pictures and more tech details the next days.
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Old Jul 26, 2012, 07:57 AM
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382 Posts
That's great... Congratulations, I knew you'd not be disappointed!

Look forward to seeing the pictures and details
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Old Jul 27, 2012, 12:00 PM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
Some more tech details:
I have installed a Jeti S-BEC which can handle input voltage from 6-42V, 4A steady (at 8S) and capable up to 12A peak. I 've set it to 5,5V, but you can also set it up to 8V for high voltage servos. The S-BES is supplied direct from the LiPo.
LiPo is 8S/4000 (2x4000 serial)
Engine control is via Jeti Master Spin 77 Opto
I also use a Jeti on board instrumentation "mui150" for current and voltage
Motor is a Hacker A50 14L V2 with 300kv turning a Xoar 15x10.
Climbing with full throttle this drive train is looking for 39A at 30V.
Not that bad
Capacity to charge was around 3000A/mh to 32000mA/h
Flight time was 6-7 minutes with throttles settings between 80% and 100%.
Not so long but this is still a warbird and has to be flown faaaaaast....

Take offs are a little bit difficult due to the torque of the motor. I have to use rudder for a very long time before it is aerodynamic stable on the take off run.

Landing with the split flips are flawless unless you have enough altitude on the final (I use them only on final not on downwind) when switching the flaps to down, because they work like an anchor and you lose speed and altitude quite fast. Be prepared to throttle up a little bit after flaps down and do not use the elevator to control height above ground at this stage. You will stall a few seconds later.
I only have the full down deflection and no intermediate position. Down or up, land or fly --> nothing in between.

I land on the mains with a few knots airspeed more as necessary for a three point landing, throttle slowly back and put the tail down with the elevator (but just enough to not going airborne again) as the Seafire slows down. In this phase lateral control again is not so easy unless the tail wheel has contact to the surface.

This bird makes really so much fun and looks outstanding in the air.

Here they are...
...some pictures from today.
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Old Aug 03, 2012, 01:36 PM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
I 've lost it!!

During a normal field pattern, flying straight and wings level, the Seafire banked without any input from my Tx.
It came inverted and crashed from a height of appr. 15 vertical into the field.
This all happend so fast I had no chance to counter steer this.
It is a total lost, nothing left to repair. Everthing is destroyed...
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Last edited by Capt Flint; Aug 15, 2012 at 09:17 AM. Reason: Poor wording
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Old Aug 03, 2012, 06:40 PM
Registered User
Leduc, AB, Canada
Joined Oct 2008
562 Posts
Quote:
Originally Posted by Capt Flint View Post
I 've lost it!!

During a normal field pattern, flying straight and wings level, the Seafire banked without any input from my Tx.
It came inverted and crashed from a height of appr. 15 vertical into the field.
This all happend so fast I had no chance to counter stear this.
It is a total lost, nothing left to repair. Everthing is destroyed...
Oh man, bad news indeed. Sorry for your loss.
Have you figured out what went wrong? Bad servo, brown out in receiver?

Cheers,
Peter
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Old Aug 04, 2012, 04:39 AM
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kittykatjaz's Avatar
Australia, NSW
Joined Jan 2011
50 Posts
Quote:
Originally Posted by Capt Flint View Post
I 've lost it!!

During a normal field pattern, flying straight and wings level, the Seafire banked without any input from my Tx.
It came inverted and crashed from a height of appr. 15 vertical into the field.
This all happend so fast I had no chance to counter stear this.
It is a total lost, nothing left to repair. Everthing is destroyed...
Oh I am so sorry to hear you lost it. Radio signal loss of a plane has to be the worst type crash. At least if it is pilot error you have something to blame.

Are you going to get another? They are worth it.
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Old Aug 05, 2012, 02:58 AM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
I use 2.4GHz equipment, thus I think it was not simple signal disturbance. Maybe the power was lost to the receiver?

We did a test at the field after the accident, but everything works as expected. Well, at least what was left and in a proper state

I will have a second one as it is really a beauty, but not yet. I need a little time to be ready for the next Seafire. And of course, I need some money as I will not re-use a single part from this wreckage although the SBEC, ESC, the receiver and some servos are working.

These are the remaining parts of the Seafire. It all fit in nice box; the wing is now in two pieces with all the servos and control surfaces broken out.
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Old Aug 06, 2012, 07:51 AM
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The43rdHammer's Avatar
United Kingdom
Joined May 2010
382 Posts
Oh no mate... there really isn't too much left is there.

Bit of a puzzler if it rolled inverted without any input, signal / power loss should result in a default to fail safe. Interference maybe?

Did you set the fail safe on the system you were using?

Andy
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Old Aug 07, 2012, 02:30 AM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
The fail safe was not pre-programmed.
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Old Aug 13, 2012, 06:09 AM
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United Kingdom, England, Nantwich
Joined Jan 2012
255 Posts
Has anyone a spare roundel? I have no idea if my dog ate one but I am one for the wing down
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Old Aug 15, 2012, 05:37 AM
Thrust is a must, lift is gift
Munich
Joined May 2008
77 Posts
I can cut out the roundels from the "remainings" of my Seafire.
Would this help you?
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Old Aug 15, 2012, 08:59 AM
Registered User
United Kingdom, England, Nantwich
Joined Jan 2012
255 Posts
Hey thanks Flint, its no problem now, I found the decal set available as a spare part so I have one on order. Thank you very much for your offer though!
Sorry to see your pics
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Old Oct 26, 2012, 06:28 PM
Rangers Lead the Way
Joined Mar 2010
2,203 Posts
Total bummer Flint and I now know that horrible feeling as it goes in. I lost my World Models Spitty in much the same way on the turn to base leg last weekend, except in my case, I'm pretty sure it was my fault (controlled alt with elevator and stalled it).

Which is why I'm in here. Nice plane and wondering if anyone knows where to get one of these in the Con US.

Other choices are another WM (it is a awesome flyer but nonscale), or the H9 Spit - which is a version I don't like as much.
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