jimkron

No...I'm off to the fishing store to get me some lead.

pandissix

My Feedback: (134)

Try Shotgun "shot" as lead weight and Z poxy it into the cowl. It will conform to the shape and never break lose.

jrb1

Is there something worng w/pg7?

jmohn

Jim,

You can stick all the battery packs up front right behind the firewall. That's what I had to do on mine. I made a hatch rught behind the front firewall and stuck all the packs right there. It balanced fine that way.

If you use 10 or 12 guage wire you should be fine. Just get the good stuff (wet noodle) stranded copper to keep the resistance down.

Mine fit in the fuze right above the front wheel bay.


Jeff

vallawyer

I started building a Do-335 from Model Airplane News a long time I go, I sold it unfinished, but the fellow who finished it needed a lot of lead to balance it.  You stick an engine onto the tippy tail of any warbird and you are going to need a lot of noseweight. It flew fine but it was a hot airplane.

jimkron

I'm a little confused on the CG location. Do I measure back 151mm from the tip of the root or from the "crook" in the wing? I've included a picture from the instructions?

Jim

Mr DJ

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Jim, my Man…

U R so excited that you are allowing yourself to question what you already know. The right side of your photo; the “or measure from here” point.

You have nothing to worry about; you are a seasoned pilot just like most of us (yes, even season pilots crash, but that’s not gonna happen here). Crank it up, Baby, and let’s rock and roll…

Mr DJ

vallawyer

Unless you have seen the plane fly you can probably cound on that CG to be nothing but a guess and on ESM planes they are often way way off.
Calculate 25% of teh wing cord at teh root and start there.

glazier808

My Feedback: (1)

Don't listen to him, his knowledge is defined by EasyTiger.

What more can I say...

but build on guys!

I got fresh popcorn!

jimkron

If Mr. DJ is right, and I think he is, I'll need to make another trip to the sporting good store. I might be up to 7lbs of nose weight.

rcmigpilot

My Feedback: (26)

Have you thought about changing the rear motor to a Power 110 on 8S with the lightest prop you can find? Lighter motor and a smaller, lighter prop in the tail will help with the balance issue and you'll still have plenty of power.

Mr DJ

Now EasyTiger is just too easy; I'm more like Super Tiger...

Mr DJ

Mr DJ

Jim,

I couldn't cut and paste, so I just added the link. Go there, then to page 15, bottom left side. Different bird, but CG config is the same: http://manuals.hobbico.com/gpm/gpma1475-manual.pdf

That's the Super Tiger way, Baby...

Mr DJ

jimkron

Hey Jeff,
I have (4) 5000 mah 5s batt to squeeze in there. Is that what you had? I have the wet noodle wire but the folks as Castle Creations did not like running the batt wires that long. Did you have any problems with the ESC?


Mr DJ,
I checked out your link. Measuring from the tip of the root makes sense, but I was hoping that Chinese builder measured differently. Measuring from the root added 3 more pounds.[&o]

RCmigpilot,
Yes, yes that has crossed my mind. I even have a Hack A-80 I could put on the front, then run a 110 on the back. Or just stay with the 160 on the front.

jim

fockewulf37

My Feedback: (102)

Here is what you need to use...I have not had time to do it myself yet:

http://www.scaleaero.com/CG_Calculator.htm

It has worked out perfect for me using this calculator..

Ty

fockewulf37

My Feedback: (102)

i use that calculator before i fly any of the ESM birds. put about 27% for the MAC and you should be good...

Ty

gonsos

There is a solution to run long wires. http://www.rcgroups.com/forums/showthread.php?t=952523

pandissix

My Feedback: (134)

Run the Tam Jet capacitor on the Esc end of your long leads. Connect the battery at the lipo end not the esc end. Being doing this with the big ME262 no failures.

Mr DJ

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Jim,

More information enroute.

Mr DJ

jimkron

Hey Ty,
This is pretty new to me.
Should I include the flaps and ailerons in the calculations?
The wing tip is quite rounded. Should I square if off at the end of the aileron?
Why 27% Mac? Is this number arbitrary?

Thanks,
Jim

fockewulf37

My Feedback: (102)

Use the whole wing. It all flying surfaces.27% is a little nose heavy. You could always use 30% if you like..

Ty

didiwatt

My Feedback: (38)

Jim:
I fly several large twins on electric, up to 50lbs.

You need to throw out all you know about gas or ethanol engines. Without getting technical, electrics fly on watts.

You need to buy a wattage meter and see what kind of wattage your motor is putting out, then you need to know how much your plane weights ready to fly.

Here is a general rule of thumb for electrics

50-70 watts per pound = minimum level of power for lightly loaded slow park flyer

70-90 watts per pound = trainers and slow flying aircraft

90 - 110 watts per pound = fast flying scale models and some sport airobatics

110 -130 watts per pound = advanced airobatics and high speed aircraft

130 - 150 watts per pound = lightly loaded 3D models and ducted fans

150 - 210+ = unlimited performance for any 3D models


So, just for giggles, I read a few comments back that the 160 on 10cell puts out 2800 to 3000 watts. So lets take 2700 and times it by both your motor for a total output of 5400 watts. (by all means please put a watt meter on your setup). Then back a few threads you said your plane weighted 31 lbs. So, 5400 divided by 31 equals 174.19 watts per pound. Perfect if you want to hover it. Now you have taken the guess work out of it and know what the power level will be.

Running on just the front motor will give you (2700 divided by 31) 87 watts per pound which will definitely fly it with authority.

As far as your batteries, I did not see any pictures of where they are located. Can you put all 4 lipo's up front? As said in the last post, you need to extend the speed controller to motor wires, not the battery to speed controller wires. You will loose a little power running them that far, but you definitely have a little room.

Hope this helps.

Paul

fockewulf37

My Feedback: (102)

Figure you wing tips as squared off...just easier

kahloq

Didiwatt is pretty accurate. Although, with the Do-335, it flies more like a jet, so, 87watts per pound will not fly it with authority. It will keep it airborne though(the 87 watts per pound being the 31 pound aircraft on 1x power 160)

jimkron

Ok, I gave the calculator a shot since we are waiting on final authority from ESM.
Here are my numbers though everyone might measure a little differently. I used 25% MAC.
Based on these calculations, 151mm for the CG is measured back from the leading edge at the "crook" in the wing.[X(]
I welcome...beg...others to do their own numbers for comparison. I don't trust me.

jim