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[cuppa]

I thought this might be a useful reference for someone so have copied it from the web:



Glow Engines vs. Electric Motors
♠ .20-size glow engine / 300w electric motor
♠ (OS Max 0.20 engine develops 0.4 hp = 300w electric motor (AXI 2820) )
♠ .35-size glow engine / 500w electric motor
♠ (Fox 0.35 stunt engine develops 0.7 hp = 522w electric motor)(AXI 2826)
♠ .40-size glow engine develops 1.0 hp = 750w electric motor (AXI 2826 or 4120)
♠ .60-size glow engine develops 1.3 hp = 975w electric motor (AXI 4120 or 4130)
♠ .90-size glow engine develops 1.6 hp = 1200w electric motor (AXI 5320 or 4130)
♠ 1.20-size glow engine develops 3.0 hp = 2250w electric motor (AXI 5330)
♠ DA-50 develops 5.0 hp = 3750w electric motor (AXI 5330)
♠ DA-100 develops 9.8 hp = 7311w electric motor (Double AXI 5330)

[Time Bandit]

I really love the Axi motors but, the list is somehow misleading.

♠ .40-size glow engine develops 1.0 hp = 750w electric motor (AXI 2826 or 4120)
An AXI 2826 can develop around 550W at 5S (and only at 5S at 4S its just 440W, 3S 330W)  for maybe 60s until it burns without air cooling.
This is probabaly the most extreme example, but if you look over the data nearly all of these "comparison" motors are underpowered.
Even the 4120 is capable of 750W only if run with 5S and also only for a few seconds in a boat without the cooling air from the prop.

[cuppa]

Thanks Tobias.