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Old May 02, 2010, 04:39 AM
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taekwondo's Avatar
USA, FL, Orlando
Joined May 2003
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I myself have been hearing people use eiher a 5 gm or 10 gm motor for these, with most using the 10g from hobbyking. Since 8gm is the one your thinking about, it should be very doable. I'm no expert, but these guys here are and I will post the specs of your motor, I think its a good choice. if you built the plane to be auw up around 4 ozs. you should have a thrust/weight ratio of l to 1 which will make for an excellent flyer. Opinions gentlemen?

Tested with AEO E-Power 5A ESC

7V: 0.25A @ 14550RPM
8V: 0.30A @ 16740RPM
10V: 0.35A @ 20850RPM

Weight: 8g
Max Power: 4A or 40W
Dimension: 17.8*20mm
Length of shaft: 5mm
Diameter of shaft: 2mm

Tested with GWS 4.5x4 Propeller
Volts Amps Watts RPM Pitch Speed (m/s) Thrust(g) Thrust(oz) Efficiency(g/W) Efficiency(oz/W)
7 2.0 14 9300 15.75 76 2.68 5.43 0.19
7.5 2.2 16 9720 16.46 82 2.89 5.13 0.18
8 2.3 18 10170 17.22 89 3.14 4.94 0.17
9 2.6 23 11040 18.69 108 3.81 4.70 0.17
10 2.9 29 11640 19.71 121 4.27 4.17 0.15
11.1 3.3 35 12210 20.68 135 4.76 3.86 0.14

Tested with GWS 5x3 Propeller
Volts Amps Watts RPM Pitch Speed (m/s) Thrust(g) Thrust(oz) Efficiency(g/W) Efficiency(oz/W)
7 1.9 13 9930 12.61 91 3.21 7.00 0.25
7.5 2.0 15 10320 13.11 99 3.49 6.60 0.23
8 2.2 17 10800 13.72 108 3.81 6.35 0.22
9 2.5 22 11730 14.90 129 4.55 5.86 0.21
10 2.8 28 12480 15.85 145 5.11 5.18 0.18
11.1 3.1 33 13110 16.65 163 5.75 4.94 0.17

Tested with GWS 6x3 Propeller
Volts Amps Watts RPM Pitch Speed (m/s) Thrust(g) Thrust(oz) Efficiency(g/W) Efficiency(oz/W)
7 2.4 17 8250 10.48 111 3.92 6.53 0.23
7.5 2.6 19 8430 10.71 120 4.23 6.32 0.22

Quote:
Originally Posted by Lilbanks96 View Post
Sorry for the double post but i was wondering if this motor would be ok for one of these birdshttp://www.hobbypartz.com/88e-mm201-...or-2100kv.html
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Old May 02, 2010, 02:04 PM
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Plymouth, Devon
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Hey rotatorus, here's one to go with your Spitfire on floats. Page I found it on is in the picture description.
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Last edited by thewildweasel; May 02, 2010 at 02:10 PM.
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Old May 02, 2010, 02:48 PM
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USA, FL, Orlando
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It's odd, but with the size of those floats, I cant imagine this plane flying well. How much do they weigh in comparison to the plane?

Quote:
Originally Posted by thewildweasel View Post
Hey rotatorus, here's one to go with your Spitfire on floats. Page I found it on is in the picture description.
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Old May 02, 2010, 03:21 PM
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's-Hertogenbosch, The Netherlands
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Hi Wild Weasel,

You had to show me.. Now I need to make another one. I have not seen this version before. It does seem as if it's pylons are very long. Other than that, it is certainly a nice one to put on the to do list. I'll look some more for additional information on this bird.

The floats itself look pretty OK. They are not much different as on the spitfire.

I have another project on my mind now and I'm not going to tell what it is... Ok, one thing I'll say... It has two engines .

Robert
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Old May 02, 2010, 03:24 PM
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what size are your floats robert? How many inches or centim.
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Old May 02, 2010, 04:01 PM
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's-Hertogenbosch, The Netherlands
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The ME109W is a hoax. As far as my short research has shown, the plane never existed. I did find another build that could take it's place. A French prototype... Dewoitine HD780.

Does anybody have images of this plane? I see two floats, a F4U wing and a P-40 fuse... .

Robert
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Old May 02, 2010, 04:06 PM
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's-Hertogenbosch, The Netherlands
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Quote:
Originally Posted by taekwondo View Post
what size are your floats robert? How many inches or centim.
Hi teakwondo,

The floats I used are aproximately 35 cm / 14 inch tall. Are you thinking of bashing a kit into a floatplane as well?

I made two movies today but both were to big for upload... I need to find some time to do it once again and leave out even more. Otherwise you could have seen the plane in the water with the waves and wind and all.

Robert
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Old May 02, 2010, 06:54 PM
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I might if they had a plane more conducive to floats, such as a beaver or J3. Maybe one day when I get my j3 flying, I can use that.
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Old May 03, 2010, 06:55 AM
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St.paul, MN
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Just a quick add-on to Roberts post
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Old May 03, 2010, 10:28 AM
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's-Hertogenbosch, The Netherlands
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Hi TGG61,

Thank you for your additional 3 view. It will come in handy when I give this one a try.

Robert
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Old May 03, 2010, 12:10 PM
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South Central......Kansas
Joined Oct 2007
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I did a little research and found that the Me 109 on floats was reported to have been considered, but never acutally built. Plans were made for it. I found this link to a site, it is all in Japanese, but if you scroll down you can see some of the plans.

http://home.catv.ne.jp/kk/galland/bf109w/bf109w1.html
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Old May 03, 2010, 01:26 PM
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Corpus Christi, Tx
Joined Jan 2010
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push rods

Is the use of carbon fiber rods a good alternative to the wire provided in the Gravity Hobby Kit?
Hoping to avoid epoxy and rod tubes as in some of the builds of the Atomic Builds.

What size CF? 1mm?

Thanks
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Old May 03, 2010, 02:53 PM
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Hi Rich,

Carbon is a good alternative to steel pushrods. The Kyosho minium series have carbon rods with steel z-bends at the ends. They can be connected by thread and shrink-tubing. Add some glue and you can get a pretty stiff connection. You will have to check the stiffness of the rod at the desired lenght but 1 mm carbon probably will do the job.

Robert
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Old May 03, 2010, 03:10 PM
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Quote:
Originally Posted by skywarp1 View Post
I did a little research and found that the Me 109 on floats was reported to have been considered, but never acutally built. Plans were made for it. I found this link to a site, it is all in Japanese, but if you scroll down you can see some of the plans.

http://home.catv.ne.jp/kk/galland/bf109w/bf109w1.html
Hi skywarp,

I have seen the site but it does not strike as reliable. The image shows an Emile on floats. But it is not clear if it is fake or not. Anybody can photoshop floats under an Emile. Other sites have had this discussion as well.

There might have been ideas for a floatfighter and it could have been an ME109E. However the pictures seen do not strike as correct.

Robert
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Old May 03, 2010, 03:12 PM
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Some other ideas for float planes can be found here:

http://www.olddogsplanes.com/floatplanes.html

Robert
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