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Old Sep 25, 2007, 02:34 PM
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R. Nordeck's Avatar
Joined Dec 2006
72 Posts
Motor ??'s

OK, I am thinking about getting the Seawind so I can fly with a friend who is working on the PBY Catalina.

??, I already have a new Horizon E-flite park 450 which is an 890 Kv brushless outrunner; and their 20A ESC. Anyone think that would work?? Prop??

Also, I live at over 5500' MSL but have been told that altitude does not effect/affect electrics. True??

Appreciate "your" advise,
Cap'n I. B. Narly
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Old Sep 25, 2007, 02:37 PM
Real Time Recon
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smith mt. lake VA.
Joined Jan 2007
8,258 Posts
Quote:
Originally Posted by R. Nordeck
OK, I am thinking about getting the Seawind so I can fly with a friend who is working on the PBY Catalina.

??, I already have a new Horizon E-flite park 450 which is an 890 Kv brushless outrunner; and their 20A ESC. Anyone think that would work?? Prop??

Also, I live at over 5500' MSL but have been told that altitude does not effect/affect electrics. True??

Appreciate "your" advise,
Cap'n I. B. Narly
Doesn't that plane weigh 3 lbs ?
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Old Sep 25, 2007, 02:40 PM
Real Time Recon
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smith mt. lake VA.
Joined Jan 2007
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And alt. will affect the plane,u will need a bigger prop.in dia.& w/ more pitch than stock.
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Old Sep 25, 2007, 02:43 PM
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Joined Dec 2006
72 Posts
reealtimerecon,

Great Planes says 24-26 oz.; but I Have not seen any real flying weights posted in entire Thread.

Thanks,
Cap'n I. B. Narly
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Old Sep 25, 2007, 02:47 PM
Plane on the Brain
coolboarder's Avatar
Joined Apr 2005
839 Posts
450 on a seawind

swap your rear motor wires to 20 awg to make up for 1/2 oz added from motor.
put on a 9/7 apc sf. to make up for altitude and lower kv
use a quality lite battery = tp 1320, tanic 1500, 1800mah something

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Old Sep 25, 2007, 04:40 PM
Foam Floats Better
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The Big Country of TX.
Joined Oct 2004
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Quote:
Originally Posted by R. Nordeck
reealtimerecon,

Great Planes says 24-26 oz.; but I Have not seen any real flying weights posted in entire Thread.

Thanks,
Cap'n I. B. Narly
Mine is 18.5 AUW, but I'm about 2-6 oz's lighter then most due to my setup.

There are a few final weights posted it this thread >here<
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Old Sep 25, 2007, 06:19 PM
Electric Coolhunter
Thomas B's Avatar
United States, TX, Fort Worth
Joined Jun 2000
14,478 Posts
Quote:
Originally Posted by R. Nordeck
reealtimerecon,

Great Planes says 24-26 oz.; but I Have not seen any real flying weights posted in entire Thread.

Thanks,
Cap'n I. B. Narly
The very first post I started the thread with has the weight of my Seawind: 21.9 oz with a 3 cell 1500 and the equipment listed in the first post. I am now flying with a 1320 and am a little lighter

A number of people are finding that the stock model with the suggested stock equipment is coming out a little lighter than the suggested kit weight.
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Old Sep 28, 2007, 12:33 PM
MaineFlyer
jpgilbert's Avatar
Augusta, Me
Joined Feb 2005
923 Posts
Just finishing up putting my Seawind together. Not flown yet. But I have some stats I will share regarding power system.
I used the recommended motor:
Rimfire 28-30-950
CC Thunderbird 18
ThunderPower 3 Cell 1320 PL
HS-55s throughout
Spektrum AR6100


Here is the MotoCalc report followed by a photo of the graph of a short static test with the Eagle Tree E-Logger.
(I modified the Internal Resistance of the TP cells in Motocalc to be more consistent with the real life test.)

Joe

*********************************************
MotOpinion - Seawind EP
1000ft above Sea Level, 29.92inHg, 70F

Motor: Great Planes Rimfire 28-30-950 (#4560); 950rpm/V; 0.7A no-load; 0.0714 Ohms.
Battery: Thunder Power TP1320 (ProLite) (13C); 3 cells; 1320mAh @ 3.7V; 0.008 Ohms/cell.
Speed Control: Castle Creations Thunderbird 18; 0.0065 Ohms; High rate.
Drive System: GP 8x6.5; 8x6.5 (Pconst=1.31; Tconst=0.95) direct drive.
Airframe: Seawind EP; 234sq.in; 21oz RTF; 12.9oz/sq.ft; Cd=0.046; Cl=0.47; Clopt=0.69; Clmax=1.24.
Stats: 92 W/lb in; 79 W/lb out; 17mph stall; 23mph opt @ 47% (60:21, 87F); 28mph level @ 53% (48:47, 90F); 1146ft/min @ 34.8; -172ft/min @ -4.9.

Power System Notes:

The full-throttle motor current at the best lift-to-drag ratio airspeed (11.6A) falls approximately between the motor's maximum efficiency current (10.3A) and its current at theoretical maximum output (75.6A), thus making effective use of the motor.

Possible Aerodynamic Problems:

The static pitch speed (57mph) is greater than 3 times the stall speed (17mph), which might make take-off or hand launching difficult, and is inefficient in flight unless high speeds are intended.
Pitch speed can be decreased by using a lower pitched and/or larger diameter propeller, a higher gear ratio, a lower cell count, or some combination of these methods.
The diameter (8.0in) to pitch (6.5in) ratio is less than 1.5:1, which will result in reduced propeller efficiency at low speeds (the propeller is stalled). Although this is not likely to affect flying characteristics, it may make take-off or hand launching difficult.

Aerodynamic Notes:

With a wing loading of 12.9oz/sq.ft, a model of this size will have flying characteristics suited to the intermediate pilot, for use in calm to moderate wind conditions.
The static thrust (16.3oz) to weight (21oz) ratio is 0.78:1, which will result in very short take-off runs, no difficulty taking off from grass surfaces (assuming sufficiently large wheels), and steep climb-outs.
At the best lift-to-drag ratio airspeed, the excess-thrust (12oz) to weight (21oz) ratio is 0.57:1, which will give steep climbs and excellent acceleration. This model should be able to do consecutive loops, and has sufficient in-flight thrust for almost any aerobatic maneuver.

General Notes:

This analysis is based on calculations that take motor heating effects into account.
These calculations are based on mathematical models that may not account for all limitations of the components used. Always consult the power system component manufacturers to ensure that no limits (current, rpm, etc.) are being exceeded.
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Old Oct 03, 2007, 02:51 PM
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Vacaville, CA
Joined Mar 2007
56 Posts
I just got back from the lake and this plane simply "Rock"!!! With the recommened setup and it is sorta wimpy during water take off. I removed and replaced the warped rudder and now it tracks much better. This Seawind (electric) is the most fun I've had since starting rc airplanes!
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Old Oct 04, 2007, 03:16 PM
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Vacaville, CA
Joined Mar 2007
56 Posts
Went flying today with winds around 10-14mph. Water was choppy but no white caps..at that time.......did I mention how fun this plane is? I don't know if it ment anything, but the vultures were coming in for a closer look. Maybe they saw something I didn't
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Old Oct 04, 2007, 09:09 PM
We shall serve the Lord
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United States, TX, Kingsland
Joined Sep 2005
4,978 Posts
IMHO, the 40" Seawind is the most fun you can have near the water with your clothes on.
Mike McD
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Old Oct 06, 2007, 05:50 PM
tic
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New Cumberland, PA. US
Joined Dec 2000
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I'm having so much fun w/ my seawind I just bought a bigger boat so there's more room for it out on the lake.. No good place to put it on our 16' bowrider.. Should be enough room in this one though
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Old Oct 06, 2007, 06:15 PM
Ozzie Express wiggy pilot
SON OF PALEFACE's Avatar
YANKALILLA , SOUTH AUSTRALIA.
Joined Nov 2002
5,234 Posts
Quote:
Originally Posted by tic
I'm having so much fun w/ my seawind I just bought a bigger boat so there's more room for it out on the lake.. No good place to put it on our 16' bowrider.. Should be enough room in this one though
Yeah right.. You bin snorting the white line again
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Old Oct 06, 2007, 06:20 PM
tic
thunderscreech
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New Cumberland, PA. US
Joined Dec 2000
10,936 Posts
Well, actually it's no joke.. We didn't buy it just so the seawind would fit though ... it's a glastron GS-259.. Great deal on an 07' leftover
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Old Oct 06, 2007, 06:55 PM
We shall serve the Lord
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United States, TX, Kingsland
Joined Sep 2005
4,978 Posts
Sweet Lookin' Water Ride! I can see you now - standing in the bow, braced against the bow rail, racing across the water, trying to keep up with your Seawind.
Mike McD
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