4inch freestyle frame 'm.a.a.t'

Hello everyone,i am Pilot22, a FPV pilot,this is my last frame design .

Frame Name
Minimal Focuses on minimal weight, emphasizing essential functions and
eliminating excess mass.
极简；飞行器的轻量化设计，专注于基本功能，减少多余重量。
Agile Rapid response and agile control.
敏捷；飞行器反应迅速，操作灵活。
Airy Lightweight design, offering excellent flight performance.
轻盈；飞行器设计轻量化，具备优秀的飞行性能。
Tenacious Maintains a robust and long-lasting structure despite being lightweight.
坚韧；飞行器在轻量化设计的同时，仍然具备坚固的结构和持久的性能。
Specialty Quadcopters Name from Initials – MAAT

Frame Design Concept
With the rapid urbanization, flying spaces are becoming increasingly scarce.
We aim to design a quadcopter with low noise, adaptable to complex environments like abandoned buildings, capable of agile movement in tight spaces. The frame must be lightweight, quiet, low-cost, and achieve performance close to that of a 5-inch quad.

在现代城市化进程中，飞行场地日益稀缺。我们需要设计一款噪音低、适应烂尾楼等复杂环境的穿越机，能够在狭小空间内灵活机动，同时确保机架轻量化、静音、低成本，并接近五寸穿越机的性能。

After extensive test flights by Pilot22 FPV, it was discovered that a total weight (excluding battery) around 170g, paired with 4-inch two-blade props and 1404 or 1604 motors, yields exceptional flight performance.
经过Pilot22 FPV长期测试飞行，发现在飞行器重量（不包括电池）在170克左右，4寸2叶桨，
1404,1604电机组合下，产生了奇妙的飞行性能。

Thus, MAAT was born.:)
MAAT就此诞生。

FLOW-style freestyle flying
FLOW风格特技飞行

Bando freestyle flying
Bando特技飞行

Safe and casual daily flights
日常高安全性休闲飞行

An ultra-low-cost, highly versatile trainer for daily freestyle and bando
flights, without sacrificing performance.
日常花飞及bando飞行却不失性能的超低成本泛用性练习机。

Recommended Setup

Frame Bare frame with full printed parts: 62g total weight
空机架，打印件全装重量62克

Motors 1404 3600Kv-3950Kv(Recommended: T-Motor, T-Motor Cine Series)
1604 3800Kv (Recommended: T-Motor)
*Motors over 12g are not recommended.
*不建议电机重量超过12克，电机安装孔位支持9X9 12X2

FC & ESC Supports 20x20 and 25.5x25.5 mountings, compatible with various
square and rectangular AIOs and mini stacks. Max installation
height: 20mm
20x20 25.5x25.5安装位，支持各种正方形，长方形Aio以及mini飞塔，
安装高度20mm

VTX Supports analog, Vista, O3 and O4. Not compatible with O4 pro
or other larger digital VTX units.
支撑模拟，Vista，O3，O4，不支持O4 Pro和老大天空端

Cameras are well protected within the frame
摄像头均有机架良好保护

Props Gemfan 4024, HQ 4025 two-blade props, Gemfan 4019 two-blade
foldable props (for casual flying). Other props are not
recommended.
乾丰4024两桨，HQ4025两叶桨，乾丰4019两叶折叠桨（休闲飞），不建议其他桨

Battery 4S 500mAh, 550mAh, 650mAh, 850mAh, 1100mAh

Recommended: 4S 850mAh (100g), 4S 650mAh (70g)
建议4S 850mah（100g），4S 650mah（70g），

With 500mAh, extreme agility is achieved;
使用500mah时飞机将会获得极致的机动能力,飞机手感倾向于牙签机；使用
850mah时，能得到适中的“抛”的手感。

With 1100mAh, up to 9 minutes of FLOW-style casual freestyle is possible.
使用1100mah时，依然可以以Flow风格简单花飞达到接近9分钟的飞行续航时间。

Batteries should be rated 90C–150C, e.g., DOGCOM, GnB, etc.
电池建议选择90C-150C电池，例如：大黄狗，鹰氪等。

Sample video
https://space.bilibili.com/14128055?spm_id_from=333.1007.0.0

Basic Screws and Standoffs
Standoffs
M3x20x5 4
M2x20x3.5 2
M2x22x3.5 3
Screws
M3x14 4
M3x6 4
M2x6 10