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Scratchbuilt and Power (Input Watts vs Thrust)

Old 11-21-2008, 09:48 PM
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dmarko
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Default Scratchbuilt and Power (Input Watts vs Thrust)

Hi All..

I am learning about how input watts per pound work.
5070 watts per pound: Minimum level of power for decent performance, good for lightly loaded slow fl yer and park fl yer models
7090 watts per pound: Trainer and slow fl ying scale models 90110 watts per pound: Sport aerobatic and fast fl ying scale models
110130 watts per pound: Advanced aerobatic and high speed models
130150 watts per pound; Lightly loaded 3D models and ducted fans
150200+ watts per pound: Unlimited performance aerobatic and 3D models
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IS there a chart to gives us a similar comparison based on THRUST to WEIGHT ratios ?

Thanks In Advance

Dave in Naples
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Old 11-21-2008, 09:53 PM
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dmarko
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...minutes later .. I think I found some info..

3-D Aerobatic Airplanes doing a lot of hovering the thrust should be about 150% of the take off gross weight. For example, if the gross weight of the plane is 10 oz, you need about 15 oz of thrust to ensure optimum performance.
High Performance Aerobatic Airplanes the thrust can be between 75% and 100% of the take off gross weight. For example, if the gross weight of the plane is 10 oz, your thrust needs range between 7.5oz and 10 oz. You have plenty of room to tailor your thrust weight ratio. Use higher thrust for performance and lower thrust for duration.
Sport Airplanes 50% thrust to weight ratio will give you good flight performance and duration.

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But any other chart would be appreciated. Thanks
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Old 07-12-2009, 08:52 PM
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gxaid
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Originally Posted by dmarko View Post

50–70 watts per pound: Minimum level of power for decent performance, good for lightly loaded slow fl yer and park fl yer models

• 70–90 watts per pound: Trainer and slow flying scale models

• 90–110 watts per pound: Sport aerobatic and fast flying scale models


• 110–130 watts per pound: Advanced aerobatic and high speed models

• 130–150 watts per pound: Lightly loaded 3D models and ducted fans

• 150–200+ watts per pound: Unlimited performance aerobatic and 3D models

Cool chart Dave, thank you.

And for all us "metric" people:

Pound (lb) ~ 0,5kg
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