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Old 08-24-2011, 09:13 PM   #1
Otto Dieffenbach
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Default Micro Polaris XXS

Here's my latest project a Micro Polaris XXS. It is 2.4 oz and has a 13 inch wingspan. Flight characteristics are excellent. See this video shot this morning....

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Old 08-24-2011, 09:22 PM   #2
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Default Other Micros in my hanger

Here are more shots of the Polaris XXS and other hanger planes. Primary building material is sheet foam made from Chevy's take home containers.


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Old 08-24-2011, 09:35 PM   #3
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Default Superman Video

Micro Superman

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Old 08-25-2011, 04:05 AM   #4
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very nicely done otto!

I think I need a signature.
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Old 08-25-2011, 08:55 AM   #5
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Very nice. Thanks for sharing.
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Old 08-28-2011, 04:06 PM   #6
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They're beautiful, Otto! Do you use modelplans or are they scratch-built?
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Old 08-28-2011, 10:45 PM   #7
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All are scratch built. The Polaris was from reduced plans from parkjets.com. The P-82 is from two PZ P-51s. Thnax again.
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Old 08-28-2011, 10:48 PM   #8
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Default Polaris XXS CG

Larry sent me a message indicating that my troubles with inverted flight may be do to a forward CG. I have now moved the CG back 1/2 inch from the location specified on the plans with little degradation in upright stability and an ability to fly and turn inverted. Will continue to experiment.
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Old 08-29-2011, 07:26 PM   #9
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Finished CG experiments and have concluded that 3/8" behind stock CG gives a good blend of stability and aerobatic performance. This assumes that you have a Polaris with a 13" wingspan. I also moved the step back with a Depron shim. If you have no interest in inverted flight, CG shown on plans is great. Next, water testing.
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Old 09-29-2011, 12:47 AM   #10
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Default First water operations

Here is a video from the first water ops. Need some suggestions on how to fix the s turning. Best.

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Old 09-30-2011, 07:34 PM   #11
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Originally Posted by Otto Dieffenbach View Post
Here is a video from the first water ops. Need some suggestions on how to fix the s turning. Best.
..
^^^^
I wonder what shimming the aft right and left wingtip floats slightly lower would do>
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Old 10-01-2011, 03:12 AM   #12
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Originally Posted by Otto Dieffenbach View Post
Here is a video from the first water ops. Need some suggestions on how to fix the s turning. Best.

Otto - sorry to take so long getting back to you.

Can you provide some close up shots of the bottom of the fuse at and just ahead of the step and of the bottom, rear and sides of the tip floats?

I suspect the root cause of the problem is due to prop torque forcing one side down into the water as you accelerate. Then, if you over correct, you get the reverse turn.

However, the way you do the step and the lower side edges on the fuse and the lower sides and rear edges of the tip floats can contribute a lot to making the problem better or worse.

The step itself as well as the bottom side corners of the fuse need to be almost razor sharp corners. The same applies to the tip float lower side corners and rear step.

In the air, you want nice rounded corners to reduce drag. In the water, its just the opposite. Those nice rounded corners will screw up the model badly.

If those corners are not really sharp 90 degree corners, then you get a huge increase in water drag. Any rounding of the corners can actually suck the model down into the water as you are trying to get up on step - just exactly the opposite of what you want to happen. In addition, it can make for directional instability at speed.

You might also try making the tip floats a tad shorter. You want them well out of the water when your on step.

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Old 10-01-2011, 03:17 AM   #13
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By the way, this kind of thing - sharp corners on the step and sides of the fuse - is important on the larger models all the way up to full scale.

However, its even more critical at very small scales because of the meniscus effect. At small scales water tends to climb up the sides of things and 'clings' more than at large scales. So those sharp corners need to get sharper the smaller you get.

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Old 10-02-2011, 04:05 PM   #14
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Default 1/2" step and 1/8" tip floats worked

Here's the video of water operations with deeper step and smaller tip floats. Did the trick. Thanx.

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Old 10-02-2011, 07:00 PM   #15
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I dont think you needed to get quite that dramatic with the step height, but glad its working better now

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Old 10-03-2011, 12:46 AM   #16
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The easiest of several options. I needed to lower the bottom line of the fuse to get more wing separation from the water so this was the easy option.
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