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PAU/BME 87" Extra 330L - Build and Fly

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PAU/BME 87" Extra 330L - Build and Fly

Old 02-20-2007, 08:03 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Yeah... the concept has been discussed a good bit... my test is whether it needs to loop arund the tank... I don't think so... just so long as the line is at or above fuel level when inverted.

If you notice... my tank is off the tank floor (thanks to the padding) and the "loop knot" I made is attached almost to the floor... in other words... when inverted the top of the loop will be at LEAST even with the VERY bottom of the tank (i.e. the fuel will not flow uphill.

Should make no difference WHERE the loop occurs as long as it gets above fuel level.

Overtime a little will drip out ANY setup as a little can work it's way aroudn the loop as KE, slow rollls, etc move the fuel through the line.

To be honest I do it more so not to spill fuel out when I lift the tail than anything...


ORIGINAL: yarom

Physics works against you this time. The reason the loop goes around the entire tank is so the fuel does not drip out when oriented nose down (nose up the tubes are already positioned right). This is assuming the pressure of the liquid can only push it in the tube until it is level with the rest of the liquid. I think it was verbalized and proven during the Greek era.

You can do as many loops as you want in the tube - if they are all below the tank when nose down, fuel will loop in the tube and then drip out
Old 02-21-2007, 01:53 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Maudib, I agree with yarom, you are going to get fuel draining out when you lift the tail above the nose with your setup. If you dont move the vent line behind the fuel source when the tail is up, it will drain out. I have flamable shoes to prove it. Your build is coming along slow but steady. I also use the foam under the ignition and zip tie it down. The only thing I've learned about that is, if you get that foam wet, through ruptured tank, rain, ect. it acts like a wick and the fluid ends up in the ignition. I always make sure if there is any chance the foam got wet, remove it immediately or the ignition will be ruined. I've seen two go out because of this. They were CH brand. I don't know if DA has a better seal or not though.

How many DA 50's have you run? Mine leans out when inverted and I hear its a comon problem with the DA 50. I've put a carb plate on mine and it still does it.
Old 02-21-2007, 01:58 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

That's true... when full and lifted up... the level will be higher won't it... hmmm....

I've had several DA50's... my first couple I sent in for the "fix"... call DA and tell them your serial number... sounds like it has the older carb block... they'll upgrade it free of course...
Old 02-27-2007, 11:03 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

So here I'am waiting for my servo's to arrive from O'brien's hobby shop (ordered on Feb 12th) and I get my Spinner from TBM and a couple of other things (relizing that I should have ordered servo's from TBM) and I have an extra cowl to play with. Found out that I need longer extensions on the engine so that the B366 will extend out of cowl properly. I think it is around a 1/4 of inch longer that I need for the extensions will have to measure to make sure. Luckily I have an extra cowl to play with for the cutouts and such so I took the damaged cowl and used it as a template so that when I do the real cuttings I will have a template to use. The spinner I got is a 3.5 inch CF from TBM cut to a NX prop, the prop is a Xoar 23x8. The engine is really large and I had to cut a hole in the side of the cowl for the carb stack as it was making contact with the side of the cowl.
Here are some pictures of the cowl and spinner installed.
John
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Old 02-27-2007, 11:32 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

You can ask Scott, but he'll probably tell you that you can remove it (needs shorter screws) or snap it off if it's the black plastic one... and that will save you from cutting the cowl out there....

Othwerwise... looks good... I know this was a "practice cowl" but juts in case... make sure you don't have sharp corners in your cuts... (you cit with a cutoff wheel?)

Use a round sanding drum to at least "drill" the corners with so you have a nice round corner (less stress and no cracking)


I use the drum only to cut out my cowls... makes more of a mess but I just starta slot and go aroudn the inside of the mark 1/16" until I "cut" the cetnerpiece out... then go back and "finish" the edges...
Old 03-01-2007, 07:22 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly



Dave,

Do you have pictures of your completed Plane??

Ward
Old 03-01-2007, 07:36 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Completed? Tee hee... well not just yet... but I'm on the "last leg" I also want to make up some custom graphics for it...very, very soon.
Old 03-01-2007, 08:55 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly


What do you guys do with these CF spinners?

I noticed you need to drill the back plate in a very specific way is order for the prop to fit exactly in the notch.

It also means that you cannot use any other prop that is not drilled exactly the same way, since it will not fit exactly with the spinner back plate, etc.
Old 03-01-2007, 09:13 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

It's actually pretty easy to drill a new prop to fit the existing spinner... just slip the bolt through the prop and backplate... attach the CF cone with the screws... rotate the prop until it's centered in the spinner cone and then mark the holes through the spinner backplate. Drill and go...

Now when I expect to play with a few sizes of props, I'l cut it for the largest so there's no problem there...
Old 03-11-2007, 11:09 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Finally got sometime to work on the airplane today.
Got the 1/2 inch extensions from PSP Mfg, Scott offered to trade out the 1 3/4 standoffs for 2" standoffs but I felt that it would still be short. With the extensions I used ended up with a 1/4 inch gap between the cowling and spinner back plate.
Got the servos mounted (except for 1 aileron servo), had to work open each hole to fit the 5985's and 5955 servos not that big of an issue.
Had one of my HD switches break when I plugged it into the Receiver.
Got both switches mounted need to mount ign switch. Waiting on Straps (velcro) for mounting the batteries, tank and ign.
Hopefully should have everything that I need to finish by this week and will get some more time to finish it.
Throttle linkage is the biggest job that I have left next to making the linkages for the flight controls.
Found one of my old carbon fiber tube setups from another airplane works for the Ailerons so I will use them in lieu of building new ones.
The issue people had with the tightness of the swivel arms is present on my airplane but the thing I found was once you worked them down the screw they felt better.
The screw seems to be cleaning the threads in the swivels. Would suggest working the swivels on a old piece of wood before installing on the airplane to clean out the threads and make it easier to install on the airplane.
John
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Old 03-14-2007, 09:38 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Well got the rest of the hardware tonight so I should be able to finish the airplane up as soon as I get time.
Question though, I only have a 7 channel receiver for this airplane so when I hook up the optical kill switch I use up the last channel on the receiver and want to hook up dual batteries.
What channel should I y into? Should I use the rudder channel (5955) or the Optical Kill Switch?
Thanks for the help.
John
Old 03-14-2007, 10:16 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Kill is probably better...
Old 03-14-2007, 10:52 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Well it's a horse a piece. Y's can fail. If the Y fails on the kill switch channel you won't have a kill switch. If the Y fails on the rudder you don't have rudder. I think I'd rather lose rudder, it's a little safer than a run away engine.

How about Y into the throttle? If that Y goes and you lose the throttle just hit the kill switch.
Old 03-15-2007, 12:39 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly


Interesting, I use a DX7 and seem to have enough channels.

Throttle
Aileron (right)
Elevator (through matchbox)
Rudder
Gear - Kill switch
Aux 1 - Aileron (left)
Aux 2 - Battery 1
Battery - Battery 2

You probably should look at getting a SmartFly matcher. They are great units and provide more channels...

This way you have all fucntionality and no Y extensions.


ORIGINAL: jgraham10

Well got the rest of the hardware tonight so I should be able to finish the airplane up as soon as I get time.
Question though, I only have a 7 channel receiver for this airplane so when I hook up the optical kill switch I use up the last channel on the receiver and want to hook up dual batteries.
What channel should I y into? Should I use the rudder channel (5955) or the Optical Kill Switch?
Thanks for the help.
John
Old 03-15-2007, 12:56 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

He's matching the Elevators in the radio with an Elevator-Aux2 mix...

By the way guys...

For mixing the elevators on the DX7 you MUST use PMix 5 or 6... 1-4 do not link the trim and therefore if you trim the elevator, the aux2 elevator half does not get trimmed unless you do use 5 or 6...

Also make sure to set Aux2 and FLAP to INH and AUX2 TRIM and FLAP TRIM to INH so you don;t accidentlly leave these channels on a switch.... (Bad Mojo)
Old 03-15-2007, 09:14 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Thanks for the suggestions guys.
Dave you are right that I'm mixing the Elevators and Ailerons with the radio. Would rather use the reciver for that in lieu of a matchbox the likes.
The other option is the batt share from Smart fly but again another point of failure but the airplane is nothing but a bunch of point of failures. I would like
to minimize how many points I have but sometimes you just have live with what you have.
It is funny how close the Spektrum and JR programming is as I believe the same 5 and 6 Programs are the ones I have to use for the elevators and ailerons.
John
Old 04-23-2007, 10:32 AM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Hi,

I am currently waiting for mine and I want to ask why no one uses titanium turnbuckles?
I like carbon pushrods on my smaller planes but for this one they seems to be weak (not pushrod itself, but connection). Turnbuckles just take a couple minutes to install and they never bend nor has any flex. Can someone please measure the length between holes on the servo arm and the control horn (for aile and elev)? I really want to use those. Thank you.
Old 04-23-2007, 11:21 AM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly



It's a valid question.

Measuring the CF rods I have installed now yields - 17.8 cm for the elevators, 11.7 cm for the ailerons.

This is measured from center screw to center screw, which means you need to deduct the length of the plastic parts at both endsbut still leave some allocation for the threads that are in...

Not sure titanium turnbuckles that long at currently available...
Old 04-23-2007, 03:03 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Thank you. I think the longest they sell are 5”, so I can find something to use on the Ailerons. But elevator should have the carbon. Too bad.
Old 04-23-2007, 03:16 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

I'm almost done with mine. Still have to program the radio and redo a couple of things I'm not happy with. ( pull pull wires are slightly touching the last former, glue some fuel line on the cowl where the spark wires are exiting, check all the bolts and order another spinner ; I measure it 4 times before cutting and just before sanding the template fell off and I attached it the other way )

Boby
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Old 04-23-2007, 03:27 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Looks great. I like the way you route all the wires. Nice and clean job. Good luck
Old 04-23-2007, 03:36 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Looks like a nice clean install.
Old 04-23-2007, 04:26 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly


Where are you hiding your batteries? I had to push all three of mine into the motor box for balance.

Do you have an engine cutoff mechanism?
Old 04-23-2007, 04:41 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

Mine are on the wing tube. Ballances great.
Old 04-23-2007, 04:43 PM
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Default RE: PAU/BME 87" Extra 330L - Build and Fly

One thing I noticed,,, you have a lot of little tabs on the bottom of that cowl where you made your cutouts. You may want to just open up the whole underside. I think you are going to get a lot of cracking going on whith it the way you have it now.

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