Build Advice

[AndrewRS]

Hi everyone, I'm new here and not having a lot of luck with the search feature to find an answer about my first build.
I found the link to eCalc...but it is very in depth and I don't know what most of the things on there are so I really am unsure how to proceed there.
However, my question is this. I have the electronics from an e-flight plane. The Hobbyzone Champ S+. The motor is a bl180 2500kv and it has a 5x2.5 propeller. I have 2s batteries for it.
Would this work in place of the A or F power pack kits here? Could I use the existing propeller with one of the MIghty Mini designs, or should I get a different propeller?

 

[Shurik-1960]

You can easily make a trainer with a flight weight of 100 g and a wingspan of up to 80 cm. The main thing is that the hands grow from the right place, and there are working brains in the head. https://www.rcgroups.com/forums/sho...lu-Baby-Primary-Trainer-**-Plans-Pics-and-Fun!

 

[AndrewRS]

You can easily make a trainer with a flight weight of 100 g and a wingspan of up to 80 cm. The main thing is that the hands grow from the right place, and there are working brains in the head. https://www.rcgroups.com/forums/sho...lu-Baby-Primary-Trainer-**-Plans-Pics-and-Fun!

The plane that the electronics came from had a 27 inch wingspan and weighed 100g.
I was looking at the mighty mini scout which is 24 inches and just over 100g. I'm guessing that if I get a propeller with the recommend specs than the motor should be good as well.

 

[bisco]

that should work fine

 

[Merv]

I agree with bisco, that should be fine.
Here are some guidelines that may be useful on your next project.

The amount of thrust needed from the motor & prop depends on how you want to fly. A slow flying trainer, the thrust will need to be 60-80% of the weight of the plane. A typical plane, 80-100%. A war bird or one with a little zip will be 100-150%. A 3D plane will need 150-200% thrust to plane weight.

Watts per pound is another useful guideline. You'll need to weigh the plane and estimate the weight of the motor and battery.

• 50 to 70 watts per pound is the minimum level of power, good for park flyers and lightly loaded slow flyers.
•70 to 90 watts per pound is perfect for trainers and slow-flying aircraft.
•90 to 110 watts per pound is good for fast-flying scale models and some sport aerobatic aircraft.
•110 to 130 watts per pound is what you want for advanced aerobatics and high-speed aircraft.
•130 to 150 watts per pound is needed for lightly loaded 3D models and ducted fans.
•150 to 210+ watts per pound gives unlimited performance for any 3D model.

Here is a FT thread with more information.

Thrust vs Power to Weight Ratios for Prop Planes

I'm scratch building the FT Cruiser and would appreciate all the help that anyone can provide in designing the power system from the ground up. I know that I can use the parts specified by Flite Test but I really want to learn the fundamentals for future builds. I'm not into 3D flying yet so I...

forum.flitetest.com

 

[Bricks]

The plane that the electronics came from had a 27 inch wingspan and weighed 100g.
I was looking at the mighty mini scout which is 24 inches and just over 100g. I'm guessing that if I get a propeller with the recommend specs than the motor should be good as well.

Changing props may be an issue as if I remember right that prop is a press fit not like most motors that have a nut holding on the prop.

 

[AndrewRS]

Changing props may be an issue as if I remember right that prop is a press fit not like most motors that have a nut holding on the prop.

Well good news, the mount is broken needs replaced so I shouldn't have an issue replacing the prop either.