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Goldberg Super Chipmunk EP ARF (Great Planes) Babe_b10
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Cox Engine of The Month
November-2019
jmcalata's

"Pee Wee .020 throttled combinated"



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Goldberg Super Chipmunk EP ARF (Great Planes) Empty
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Goldberg Super Chipmunk EP ARF (Great Planes) Empty Goldberg Super Chipmunk EP ARF (Great Planes)

Post  MauricioB on Sun Nov 03, 2019 11:30 pm

Hi guys, in the future I plan to assemble this model, I will convert it to Glow, that is, from EP to GP, which motorization they think would be suitable for this model:
A .061 MPJET?
A .061 Norvel?
A .074 Norvel?
A .09 Tee Dee RC Cox?
A .10 O.S. FSR?
A .10 O.S. FP?
A .15 O.S. FP?
A .15 Super Tiger?
Thank you!!!!
SPECS:  
Wingspan: 38" (965mm)
Wing Area: 242 sq in (15.6 sq dm)
Wing Loading: 13.7-14.8 oz/sq-ft (42-45 g/sq-dm)
Length: 28" (710mm)
Goldberg Super Chipmunk EP ARF (Great Planes) Ch210
Goldberg Super Chipmunk EP ARF (Great Planes) Ch110
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Post  1/2A Nut on Mon Nov 04, 2019 12:12 am

Kris has one that flies well with a Norvel .074
I would fly it with at least that much power.
It also helps with low weight and stress to the
electric designed airframe.

OS .10 FP would provide good vertical.

Popcorn


Last edited by 1/2A Nut on Mon Nov 04, 2019 12:39 am; edited 2 times in total
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Post  1/2A Nut on Mon Nov 04, 2019 12:28 am

I wonder if if could handle the small O.S. .20 Four Stroke?
I bought this one off ebay last year.

OS FS .20 Four Stroke / APC 8x7 / OS .30 Muffler
12,112 rpm / .37hp - 276w / 28oz - 1.73lbs thrust / 80 mph pitch speed
25% nitro / 20% castor (stock spec is .31hp)



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Post  Surfer_kris on Mon Nov 04, 2019 2:05 pm

The pictures seem to show the one from Great Planes rather than the Carl Goldberg one?

I have converted the CG version to glow some time ago and I wrote a little about that conversion on the RCU forum at the time: http://www.rcuniverse.com/forum/1-2-1-8-airplanes-70/9052204-super-chipmunk-conversion.html

In terms of power a .10 engine would in principle be fine and it would allow for a bit wider prop selection compared to the Norvel .074 engine but one have to keep in mind that these are chinese ARF's and they a rather weak in their construction. I have reinforced mine around the fire-wall, and have also put triangular spruce to reinforce the fuselage sides from the firewall and back past the wing.

Pros and cons in short:
Norvel .061: It will not handle a large enough prop size for the plane, at least a 6x4 props are needed I feel.

MP Jet .061: Might "fly it" on a 6x3 prop, but not very well in terms of performance.

Norvel .074: I think this hits a sweet spot, with its low overall weight and the performance on the APC 6.3x4 prop I think it is idéal for the plane. The power to weight ratio is very hard to match.

OS .10 FSR: This could work well on eg. a 7x4 prop, but these engines vibrate a lot around full throttle and I don't think that it would be suitable for the weak airframe in the long run. One would also struggle to fit it inside the cowl.

OS .10FP: This would be stellar on a 7x5 prop, more like a pylon plane, but risking to fly the airframe appart.

Here is a short video with the Norvel .074 engine, I was mainly playing around with the engine, trying to find a low but reliable idle (I'm adjusting the radio stop and checking that the engine doesn't hesitate even with a quick bump on the throttle):

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Post  MauricioB on Mon Nov 04, 2019 9:35 pm

Thanks Kris for all this data!
The model says Carl Goldberg for Great Plans, Yes we are talking about the same plane!
What do you think of a .09 Cox Tee dee R / C?
Goldberg Super Chipmunk EP ARF (Great Planes) Sin_tz10
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Post  Surfer_kris on Tue Nov 05, 2019 7:40 am

Okey, that's the "reproduction" model. I haven't seen any around here but there are few visible changes:
- magnetically held hatch on the top (rather than mechanical)
- included pilot figure
- changed servo location for elevator and rudder

There are slight differences in the specs, see below. Notably a higher weight is given, not sure if that is good (i.e. stronger structure) or simply due to a different recommended electric set-up. Mine is just shy of 20oz (if I remember correctly), and it flies very well at low speeds. Anything around 23oz or higher might be better off with a .10 engine, but it will be very hard to fit that inside the engine-cowl I think. Overpowering these things will not work well, there is quite a lot of wing incidence and the model tends to balloon at full power. I have added engine downthrust on mine in order to somewhat reduce the effect. For a faster model it would be good to reduce the wing incidence instead.

Here are the specs for the original CG model:
Goldberg Super Chipmunk EP ARF (Great Planes) Specs_10

I haven't flown anything with the Cox .09RC yet, so I cannot give much advice there. It is about 1oz heavier than than the Norvel .074, but it should be able to handle a 7x3.5 prop, so that might compensate somewhat. It would be cool to have a scale version of the N13A with the Cox marking Smile

Goldberg Super Chipmunk EP ARF (Great Planes) N13a10
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Post  akjgardner on Tue Nov 05, 2019 4:42 pm

I vote Norvel .074. It would fly that bird nicely
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