PDA

View Full Version : T-28D Carnage



WJCJR1
08-29-2009, 07:01 PM
I buried my Power15 enhanced T-28D today. Being a bit gutsy at our neighboring airfield Fun-Fly which my Airfield was invited to I made an error.

The winds, however relenting now, were roaring nicely this morning with a constant mid to upper teens with gusts to mid 20's and higher. Complicating the winds a stand of tall trees was resulting a swirling unpredictable wind.

Enough with that though I made an error in judgement in how fast the plane was approaching the ground as I descended from a previous vertical blast to~350'. WOW can this thing cook with that Power 15 mated to a 4S swinging a 8X8 prop. I descended from this aforementioned rolling climb and did so in an inverted narrow descent and as I rolled out the inverted position the wind caught the wings now 90* from the wind and began blowing the plane's track towards the pit area. I banked away from the pits, leveled and turned about 50* away from the pits and as I begin my travel away from myself I did not judge how fast the wind would push the nose to the ground as I was still in a slight nose down atitude and as soon as I realized my error it was over.

This thing REALLY cooks, WOWWY. Off of test data I am turning the prop at a phenomenal rate and even with the only 8" diameter it is a rocket ship and the 8" pitch propels this thing into the wild category.

I actually believe all parts except the motor mount are salvageable. I retrieved the motor and cowl, about 20 feet from the rest of the rubble and then energized. All electronics work, motor shaft is not bent. Could have been a lot worse but given this is my first time drilling a plane it is a significant disappointment I do not intend to repeat. This was totally preventable with some pulling back on the go stick as I knew it was turbulent and windy as heck.

End result,


Fuselage is nearly snapped in two longitudally,
Wing mount is torn clear off wing with about an inch of material gone from wing,
Rudder hanging by a thread,
Left aileron servo arm snapped,
Servo rod broke,
Cowl is broken in three places,
Horizontal stabilizer snapped in two,
Motor mount ripped clean apart.
I have purchased a new Horizontal stabilizer, fuselage, wing, motor mount, cowl, servo horns and aileron rods.

As mentioned above all these pieces are fixable but I need to be flying tomorrow morning so I purchased new replacement parts and will piece these back together as backups or a second piece together plane.

Wayne

ATIS
08-29-2009, 07:23 PM
Sorry about the lose... you could use the wing to add flaps!! It would be a nice mod and give you a chance to practice repairs and mods... no crash is ever a total lose. The parts can be used to learn repairs/painting/mods on.

WingingIt74
08-29-2009, 08:03 PM
That's a bummer man, but good to hear she's a rocket.

WJCJR1
08-29-2009, 09:11 PM
Super Rocket! Scavenge and rebuild is about 70% complete. Getting tired of looking at servos and wires right about now. Toying with some ideas to move battery back as well to correct COG without adding as much. Not hard at all to do but want to make sure battery does not shift in flight as we know what happens when she hits the ground at over 80mph, Kaaabllooooeeeeeee!

ATIS you are absolutely correct an accident makes one tear it apart look at it's structure, make enhancements, learn building tricks, understand even more how everything works in perfect harmony.

In addition my DX5e was last running my Apprentice, I am going to set all the flight surfaces now to the Apprentice. Although with today's wind a perfect dialing in was not possible for someone of my ability still I can get both airplanes closer in trim to each other, they were WAY off before. ALL surfaces were 8-9 clicks opposite of the other plane! Made for an interesting swap today when I took off with the Apprentice and adjusted the elevator and rudder trims but forgot the ailerons, thought another was heading in :no:: but got her trimmed using ALL digits on both hands. I forgot about that till just now, some things you just want to forget! ::irked::

Wayne

WJCJR1
08-30-2009, 08:55 AM
T-28D back together with a COG help of moving hte battery back. I'll take a picture and post in case anyone wants to try.

Plane looks good, motor sounds fine no more vibration or noise than stock so I got lucky she didn't nose more. LIPO involved in the crash appears fine as well.

More later WAY late,
Wayne

ATIS
08-30-2009, 12:41 PM
Wayne, good job saving her... let us know how she flys, planes always seem to fly better after a good crash!!

WJCJR1
08-30-2009, 08:07 PM
Remaidened the Super Rocket T-28D, all as good as new.

Will post my pics of the battery storage adjustment I put in place in the T-28D tips/tricks area.

Still need to enforce the wing of this latest version but was stiff anough for today's remaiden flight.

Wayne

ATIS
08-30-2009, 08:13 PM
well, how did she fly??

WJCJR1
08-30-2009, 08:32 PM
Awesome, as good as new, when I first set her up. I need to get another handful of 8X8 props as these guys ROCK. Better numbers and less juice. I will post in T-28 areas this mod and suggested prop. This 8X8 delivers unmatched speed and still relentless vertical performance and at a juice level that means you could fly WOT the whole time and be within the continous use numbers for the Power15 and never HAVE to back off.

I was using the stock T-28 flimsy 9.5X7.5 prop today and briefly an APC 9X7.5 but my reaming was not perfect and she wobbled. HATE reaming props!

Motor and all sounded and performed great.

The Qty:4; 4S-2150 Rhinos I have appear to be hanging in there as well, have about 6 flights each and all good so far. Still need to set ESC for a 4S now that I have redone the internals for a 4S only I could get another minute of flying if I reset. The stock ESC setting kicks the battery off at a very high setting and I am not much liking it, no practical rearming after it hits LVC and the battery has too much left in her, scream right up to kick out.

With the added weight of larger 4S battery, larger motor, larger ESC and aft weight to balance her she handles nicer than stock. Landings are even better than stock with a very controlled super stable wing loaded approach, in flight she takes minor winds as they weren't ever there.

Moving the battery back I dropped 1/2 ounce of the 2 ounces I needed for the first set-up of this Power15 rocket-ship. I still have 1 1/2 ounces of dead weight and I hate dead weight. I will be playing around and see what I can do with that battery moving even further back. I will post pics tomorrow of the internals and what I have done to make a new battery box, very simple and effective. Will post more detail tomorrow and beyond in the T-28 areas.

Wayne