Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Dec 10, 2008, 09:44 AM
niner555 is offline
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Great Planes P-47


Looks like there's a new P-47 on the market!

I just spotted this on Great Plane's website. It looks very scale and can be set-up for either fixed gear or belly landing.

I think a little detailing like a radial engine, drawn-on panel lines and some cockpit detailing and it will be a really fine stand-off scale plane.

Been looking for a bubble-top P-47 to replace my very worn WattAge P-47 and I think this one will fit the bill!

Enjoy,
Matt

SPECS:

Stock Number: GPMA1479
Wingspan: 39.5 in (1005 mm)
Wing Area: 290 sq in (18.7 dm²)
Weight: 41-45 oz (1160-1275 g)
Wing Loading: 20.4-22.3 oz/ft² (62-68 g/dm²)
Length: 34 in (865 mm)
Requires: 4-channnel radio w/4-5 servos, 2-stroke .25 engine or 1200kV out-runner brushless motor, 45A brushless ESC & 11.1V, 3200mAh LiPo battery pack

Link to Great Planes info on P-47


.
Last edited by niner555; Dec 10, 2008 at 10:14 AM.
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Old Dec 10, 2008, 09:54 AM
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Wow - that looks pretty good to me I'm enjoying the Hyperion .25 'Stang and the HK .25 Spitfire. What's one more?
Old Dec 10, 2008, 10:17 AM
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I am interested but I bet it cost big bucks though.
Old Dec 10, 2008, 10:24 AM
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Originally Posted by Coop
I am interested but I bet it cost big bucks though.

I see it's at Tower for $119.95 .... I don't think that's too bad at all for a fully built-up balsa ARF.

Looks like they are due in at the end of Dec.

http://www3.towerhobbies.com/cgi-bin...&I=LXVVG5&P=ML

Matt
Old Dec 10, 2008, 10:27 AM
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$119.00 for a .25 ARF is not a bad price point - and you know that there will be a few discounts to be had. The Hyperions run for $150-200 for the same size, although those do come with retracts....
Old Dec 10, 2008, 10:29 AM
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Yea that isnt too bad. They do not say which motor will power it though. Any guesses?
Old Dec 10, 2008, 10:31 AM
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That weighs a TON. 45oz on a 40" span bird?
There are kits out there at this size that have less than half the weight with retracts and many more scale details.
Old Dec 10, 2008, 10:33 AM
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that price is not scary I would like to know what brand the propnut is?
Old Dec 10, 2008, 10:43 AM
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Coop - a quick and dirty guesstimation can be made by... multiply the displacement by 2 and add a zero to find the watts needed to fly. For example...

.25 x2 = 50 + 0 = 500 watts will approximate a .25 glow motor. Fine tune to your taste. 500 watts is "do-able" on 3s, but it would be better on 4s. I fly my .25 sized birds on 1000Kv to 1500 Kv motors with 11x7 to 10x5 props for a cost of around 40-45 amps static on 3s batteries.

p.s. I do not like to fly slow
Old Dec 10, 2008, 10:51 AM
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Quote:
Originally Posted by tommyeflight89
That weighs a TON. 45oz on a 40" span bird?
There are kits out there at this size that have less than half the weight with retracts and many more scale details.
Yea, that seems a bit heavy..... I am guessing they quoted the weight with a nitro based motor package and landing gear. In my experience, something that size, electrified, set-up for belly landing, with the battery they are listing should be around 38-39 oz. in my estimation. Should be a real fast plane with that wing loading

Matt
Old Dec 10, 2008, 11:36 AM
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Mmmm, if it were a Razorback, I'd be all over it....just don't like the lines of the bubble top.
Old Dec 10, 2008, 12:51 PM
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Quote:
Originally Posted by tommyeflight89
That weighs a TON. 45oz on a 40" span bird?
There are kits out there at this size that have less than half the weight with retracts and many more scale details.
I hope that the first person that gets this model goes through the trouble to weigh all the parts on a digital scale and tally up the empty weight of the model and this will give a good indication of the final "ELECTRIC POWER" version fully flight ready weight.

I have done this with my new World Models P-51D Mustang "EP" of 49 inch wing span (With Retracts!!!) and does not surpass 2.8lbs. (44.8oz.) Fully Flight Ready!!!
Old Dec 10, 2008, 03:21 PM
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Quote:
Originally Posted by JimNM
$119.00 for a .25 ARF is not a bad price point - and you know that there will be a few discounts to be had. The Hyperions run for $150-200 for the same size, although those do come with retracts....
and the Hyperion's fuselage are composite not built-up.
Old Dec 10, 2008, 05:34 PM
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Comparison Only!


You guys do realize that this Great Planes P-47 has very similar qualities (jig manufactoring) as that of the Great Planes P-40 Warhawk that professes dual GLOW and ELECTRIC power systems.

http://www.greatplanes.com/airplanes/gpma1472.html


again, here is the P-47 product information for comparison:

http://www.greatplanes.com/airplanes/gpma1479.html


Differences in Power System Recommendation is that for the P-40 Warhawk, it is recommended to use the RIMFIRE 35-30-1450 motor (1450Kv) and Great Planes recommends for the P-47 the RIMFIRE 35-30-1200 (1200Kv).

As far as the weight issue, I can see why the heavy Ton Tossy estimate as they ask for the Great Planes "Electrifly" 3-Cell, 3200mAH, Li-POLY that tips the scale of an estimated 9+oz.


If I ever consider this model whenever it finally arrives at our local hobby shop, I would not bother to mess with any RIMFIRE delivering such High Kv such that you need large Li-POLY Cells and I would personally install the E-Flite 480 (1020Kv) that measures almost exactly the same motor dimensions of that of the recommended RIMFIRE:

E-Flite 480 (1020Kv):
http://www.e-fliterc.com/Products/Te...rodID=EFLM1505
Overall Diameter: 35mm (1.40 in)
Shaft Diameter: 4mm (.16 in)
Overall Length: 33mm (1.30 in)

Using the APC "Slow Flyer" 10 X 7 propeller with the lighter 3-Cell, 2200mAH, 20C, Li-POLYs would allow for very Low Wing Loading and make these two models fly very well without any Ugly Tip Stall events.

My 0.05 Cents Worth.
Old Dec 10, 2008, 10:41 PM
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Quote:
Originally Posted by guapoman2000
You guys do realize that this Great Planes P-47 has very similar qualities (jig manufactoring) as that of the Great Planes P-40 Warhawk that professes dual GLOW and ELECTRIC power systems.
Yep and their both butt ugly too!


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