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Herr Aquastar conversion

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Old 03-25-2004, 02:38 AM
  #1  
wright3
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Default Herr Aquastar conversion

Anyone converted the Aquastar? Such a pretty plane! I'd like to power one with a Himax 2025-4200 that is currently in my Formosa.
I'd like to run it geared but don't know if the pylon is tall enough for a big prop and it probably wouldn't be wise to raise it up too much. I use 2S lipos, 3.75 gearing, and an 11x8 prop on the Formosa and get great performance.

Anyone know the all up weight I can expect with this set up in the Aquastar? It'll be carrying the 2S 1500 Kokam, Hitec feather and 3 9 gram servos

Does anyone know if the take-off problems they used to have with this seaplane have been solved?

25 hours of air time with the Formosa has me pretty hooked on planes that stunt well. How's the Aquastar do?

Any comments appreciated. Thanks

Randy
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Old 03-27-2004, 06:54 AM
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Default RE: Herr Aquastar conversion

Randy do a search over at the e-zonemag.com That plane has been done many times.I flew one on a standerd 6v sp400 can motor. I never flew it off water but many people have had good sucsess with R.O.W. You will need to modifi the Chin rails along the bottom off the fuse.Also with that big prop you will need to make a bigger engine pylon.I also made a new one cause I only flew mine over grass(Hand launched). Anyhow have fun.stefanP
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Old 03-14-2006, 10:58 PM
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Default RE: Herr Aquastar conversion

How did you make out with the electric conversion? I just picked one up built at a swap meet, and I'd like to convert it as well. I'm thinking some kind of LiPo/brushless combo. It doesn't have ailerons though. Has anyone found a good electric setup with this plane?
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Old 03-14-2006, 11:08 PM
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Default RE: Herr Aquastar conversion

FWIW, I'm planning an Aquastar conversion with the following setup. Haven't started it yet, so numbers are only theoretical at this point.

Motor: HiMaxx HA2015-5400; 5400rpm/V; 1A no-load; 0.12 Ohms.
Battery: Thunder Power TP1320 (ProLite) (13C); 3 cells; 1320mAh @ 3.7V; 0.033 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: Cobri 20-68/21, APC 6x4; 6x4 (Pconst=1.11; Tconst=1) geared 3.24:1 (Eff=80%).
Airframe: Herr Aqua Star; 245sq.in; 18.9oz RTF; 11.1oz/sq.ft; Cd=0.052; Cl=0.52; Clopt=0.67; Clmax=1.08.
Stats: 87 W/lb in; 54 W/lb out; 17mph stall; 21mph opt @ 51% (48:34, 95°F); 24mph level @ 55% (42:54, 97°F); 763ft/min @ 23.8°; -175ft/min @ -5.3°.
Conditions: 400ft above Sea Level, 29.92inHg, 80°F

Batt Amps = 10.2
Motor Amps = 10.2
Motor Volts = 10.1
Input (W) = 102.5
Loss (W) = 38.9
MGbOut (W) = 63.6
MotGb Ef(%) = 62.0
Shaft Ef(%) = 56.3
Motor RPM = 46806
Prop RPM = 14446
Thrust (oz) = 11.4
PSpd (mph) = 54.7
Time (m:s) = 7:47
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Old 03-14-2006, 11:10 PM
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Default RE: Herr Aquastar conversion

With the 2025-4200, might look something like this.

Motor: Himax HA2025-4200; 4200rpm/V; 0.75A no-load; 0.075 Ohms.
Battery: Thunder Power TP1320 (ProLite) (13C); 3 cells; 1320mAh @ 3.7V; 0.033 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: Cobri 20, APC 6x4; 6x4 (Pconst=1.11; Tconst=1) geared 2.7:1 (Eff=80%).
Airframe: Herr Aqua Star; 245sq.in; 19.5oz RTF; 11.5oz/sq.ft; Cd=0.052; Cl=0.52; Clopt=0.67; Clmax=1.08.
Filter: 10A max (per ESC); 17.2A max (per parallel Battery).
Stats: 79 W/lb in; 54 W/lb out; 17mph stall; 22mph opt @ 53% (52:06, 89°F); 25mph level @ 58% (43:38, 90°F); 763ft/min @ 23.4°; -178ft/min @ -5.3°.
Conditions: 400ft above Sea Level, 29.92inHg, 80°F

Batt Amps = 9.5
Motor Amps = 9.5
Motor Volts = 10.2
Input (W) = 96.1
Loss (W) = 30.7
MGbOut (W) = 65.4
MotGb Ef(%) = 68.0
Shaft Ef(%) = 62.2
Motor RPM = 39373
Prop RPM = 14583
Thrust (oz) = 11.6
PSpd (mph) = 55.2
Time (m:s) = 8:22
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Old 03-15-2006, 12:41 AM
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Default RE: Herr Aquastar conversion

So you're using an 11.1 LiPo? I wonder if you could go as big as a 2200 MAH (Zagi Lipo) I really want mine to ROW, otherwise it's kinda pointless. I read somewhere you need to add some angle to the wing incidence, I guess with shims or something. So why are you considering a geared setup as opposed to direct drive? Won't the pylon height/prop clearance become and issue?
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