How to make a small model airplane take off (not working yet)

  • Thread starter Thread starter chwala
  • Start date Start date
  • Tags Tags
    Airplane Model
Click For Summary

Discussion Overview

The discussion revolves around the challenges of making a small model airplane take off, focusing on motor capacity, battery specifications, and design considerations. Participants explore various factors affecting flight, including weight, propeller efficiency, and materials used in construction.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant inquires about varying motor capacity or battery to ensure takeoff, referencing a video of a plane that did not take off.
  • Another participant expresses skepticism about the plane's ability to fly due to its weight and poor design, suggesting alternatives like a balsa wood plane or an electric conversion kit.
  • Several participants question the relevance of the original post to introductory physics homework, noting the lack of a relevant equation.
  • There is a discussion about increasing battery capacity to 9 volts and its potential impact on torque and current flow.
  • Participants suggest that reducing weight and improving the propeller design would be more effective than simply increasing battery capacity.
  • One participant proposes using light paper for the prototype, while another expresses confusion about the direction of the project, suggesting that starting with a paper prototype may not align with the original goal.
  • Suggestions for materials include plastic foam and mylar, with a recommendation to consider ready-made components for better results.
  • Concerns are raised about the lack of information regarding the actual plane being discussed, leading to uncertainty in providing effective advice.

Areas of Agreement / Disagreement

Participants exhibit a mix of agreement and disagreement, particularly regarding the relevance of the original post to physics homework and the best approach to achieving flight. There is no consensus on the optimal design or materials for the model airplane.

Contextual Notes

Participants acknowledge limitations in the information available about the actual plane being discussed, which affects the ability to provide targeted advice. There are unresolved questions about the specific design and construction details of the model airplane.

chwala
Gold Member
Messages
2,828
Reaction score
425
Homework Statement:: I would like to know how to probably vary the motor capacity or battery in that case to ensure that the plane takes off. In the attached link- the plane did not take off.
Relevant Equations:: Physics

Kindly find the link of a video on the same- downloaded from Youtube.

 
  • Like
Likes   Reactions: Delta2
Physics news on Phys.org
Hi,
While that's a cute little arts and crafts project, I'm not sure it has good odds of being able to fly. It's pretty heavy and has a very poor propeller and wings. Compare to the classic balsa and rubber band plane:
https://www.amazon.com/dp/B01EZ1N3GM/?tag=pfamazon01-20
44_CaptainStorm.1__60026.1608661669.jpg

Maybe you could combine one of those with this electric paper airplane conversion kit:
https://www.amazon.com/dp/B00DTIYD4Y/?tag=pfamazon01-20

2.jpg
 
  • Love
  • Like
Likes   Reactions: Delta2 and anorlunda
Question to @chwala: What does this have to do with Introductory physics homework? Your "relevant equation" is not even an equation or relevant.
 
  • Like
  • Love
Likes   Reactions: Delta2 and berkeman
kuruman said:
Question to @chwala: What does this have to do with Introductory physics homework? Your "relevant equation" is not even an equation or relevant.
Agreed. Thread moved from HH/Intro Physics to the DIY forum.
 
kuruman said:
Question to @chwala: What does this have to do with Introductory physics homework? Your "relevant equation" is not even an equation or relevant.
My apologies...
 
chwala said:
My apologies...
No need to apologize, we have it all sorted out. So what's your next step for getting things reliably off the ground?
 
berkeman said:
No need to apologize, we have it all sorted out. So what's your next step for getting things reliably off the ground?
I am still looking at this...The torque will be largely determined by current flow...increasing battery capacity to DC 9 volts would that help?
 
chwala said:
I am still looking at this...The torque will be largely determined by current flow...increasing battery capacity to DC 9 volts would that help?
It might help but you would do a lot better by reducing unnecessary weight and make significant improvements to the propeller.
 
  • Like
Likes   Reactions: berkeman
DaveC426913 said:
It might help but you would do a lot better by reducing unnecessary weight and make significant improvements to the propeller.
Yes, i had thought of using light paper for the prototype...
 
  • #10
chwala said:
Yes, i had thought of using light paper for the prototype...
OK, now I'm confused.
I thought the challenge was to get that plane in the air - essentially, the one in the video.
A paper prototype would essentially be starting from scratch.
 
  • #11
DaveC426913 said:
OK, now I'm confused.
I thought the challenge was to get that plane in the air - essentially, the one in the video.
A paper prototype would essentially be starting from scratch.
I was thinking that the material used was not light enough...
 
  • #12
Google for "diy rc plane". Best material these days is typically some kind of a plastic foam, like Depron, Styrofoam etc. Unless you really know what you are doing it is best to buy a ready propeller, small LiPo battery, brushless motor and you should be ready to go.
 
  • Like
Likes   Reactions: Delta2, russ_watters and chwala
  • #13
chwala said:
I was thinking that the material used was not light enough...
Yes. I am coming around to the idea that the plane in the video is not the actual type of plane you're trying to get moving. The opening post led me to believe that was the plane.

You are simply using the video as a talking aid, nothing more.

Sorry for the thread pollution.

In that case, yes, paper would be quite light. Some planes use mylar stretched over wire, which can be even lighter.
 
  • Like
Likes   Reactions: Delta2, Rive, russ_watters and 1 other person
  • #14
DaveC426913 said:
I am coming around to the idea that the plane in the video is not the actual type of plane you're trying to get moving. The opening post led me to believe that was the plane.
Same here.
Since nothing is known about the actual plane it's a shot in the dark, but: make sure that
- you have at least some wing profile
- check if your plane can glide.
 
  • Like
Likes   Reactions: berkeman and russ_watters

Similar threads

  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 81 ·
3
Replies
81
Views
12K
  • · Replies 9 ·
Replies
9
Views
5K
  • · Replies 14 ·
Replies
14
Views
1K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 1 ·
Replies
1
Views
8K
  • · Replies 21 ·
Replies
21
Views
8K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 5 ·
Replies
5
Views
5K