BBW Carden 300 (Prototype)

[EXTREME FLIGHT]

Awesome Wayne! Great job Walt and Dave-I've really enjoyed following this thread.
When will this one see its first competition Wayne?

[Wayne]

Houston IMAC at the end of April.

[zzw26n]

This might sound a little stupid; but after watching the maiden video, I felt like I just finished a great Novel. Hours and Days of reading, and then the final chapter, success! What a great Thread! Has to be the best read in RC for me.

Congrats! Wayne Hope your standing top shelf several times, in the 2007 season.


Ward

[Vic3D]

Wayne,

How's the rudder authority compared to the 260?

[Pittsflyboy]

Congrads to all, I really enjoyed the build and learned a lot.

What prop are you running?

Tom

[Wayne]

Vic,

Hard to say, with only two flights on it its difficult to make any fair comparison yet.
Also, my 260 has 8711's on the rudder and this plane has 8611A's.
Once the 8711's get installed in this plane and I get more flights on it, I will be able to tell the differences between the two planes a little better.


Tom,
I flew it yesterday with a Mejzlik 28.5x12 3B
I will also fly it with a Mejzlik 30x12 2B.

[madmax]

OMG. This is officially the second longest thread in FG history!! Thanks Walt & Wayne!!! Absolutely killer seeing the progress on this, and the maiden video!! I felt it move.

[Vic3D]

Yeah the Kiwi thread is gonna be hard to beat.

Wayne, thanks! Keep us posted.

[dmichael]

Here's mine. As Wayne already knows, the white is actualy pearl white except on the bottom of the fuse and wings/tail.

I went hard working on it until the Christmas Holidays and then put is aside for a while. When I started seeing Alberts getting covered my motivation was rekindled. Now that I have seen yours and seen it fly I am really "jones-ing" to get it done!

Dave

	Quote: Originally Posted by Wayne
	Dave, Post a pic of yours here so everyone can see that cool scheme you have on your 300.

[dmichael]

Pics

[zzw26n]

looking good Dave .............

[Walt]

	Quote: Originally Posted by madmax
	OMG. This is officially the second longest thread in FG history!! Thanks Walt & Wayne!!! Absolutely killer seeing the progress on this, and the maiden video!! I felt it move.

Hey Max: We'll try to shorten the next one up a few pages, Walt

[Andy Thomas]

Wayne, I know you explained your balancing method on uni once but I cannot find the thread. Would you please explain it again in detail?

[Wayne]

Andy,

This method is how I go about checking CG on a plane that weighs too much to put on a CG machine or lift.

Have the plane all assembled RTF minus fuel. Find a place where you can put the nose of the plane up against a wall. Take a level and prop up the tail wheel till the fuse is sitting level. Your gonna have to take the hatch off in most cases to set the level on.

Once the plane is sitting level, mark on the ground the two points where the main wheels are with masking tape and draw a line right where the wheels contact the tape. Then make a mark where the center of the tail wheel sits in the same manner. Its gonna be on whatever you propped the tail up with. (I use magazines)
Its also a good time to measure from the wall, how far back the recommended CG is. Save that number for later.

What you are looking for at this point is the distance to each wheel from the tip of the spinner. (which should be touching the wall at this point)
I use a long straightedge to get the distances

Lets say you come up with theses numbers:
LH main - 22 inches
RH main - 22 inches
Tail wheel - 70 inches

Now get a scale and place it under each wheel individually. You will have to re-adjust the other wheels to keep the plane sitting level. Add more magazines.
(If you have three scales you can get the weights at the same time but make sure the plane is level)
Remember to put the hatch on after you level the plane before you weigh each wheel. You gonna wind up with three weights. One for each wheel.

Lets say you come up with these numbers
LH main - 9lbs
RH main - 9lbs
tail wheel - 5lbs

Now its just a simple math problem to find where the CG sits right now on the plane.

Weight x ARM (distance) = Moment
22x9=198
22x9=198
70x5=350

Now add the total of all the moments and the total of all the weights.
Weights 9+9+5 = 23lbs
moments 198+198+350 = 746

Then divide the total moments by the total weights.
746 divided by 23 = 32.43

That number 32.43 is "in inches" how far back from the tip of the spinner to where the plane balances right now.
Compare that to the distance that you measured earlier to the recommended CG location.
If you are off one way or another adjust items then recalculate the weights. The distances (or ARM's) aren't going to change so you already have those numbers.


It may sound confusing and a lot of work but it really only takes about ten minutes to do it.

This is generally how full scale planes are balanced. You cant go lift one of them by your fingers or stick it on a CG machine.

Try it......

[Andy Thomas]

This is great stuff!!
Thanks!