A custom ultra-light 1S 2-inch toothpick FPV quad designed around a specific idea:
Use a small, high-KV 2-inch powertrain for extreme responsiveness and punch, but place it on a larger 96 mm frame to gain stability, grip, protection, and a more locked-in flight feel.
This is not a normal compact 2-inch toothpick, and it is not trying to become a slow, floaty 3-inch cruiser.
It is designed to sit between both concepts:
- 2-inch response
- high-KV punch
- low prop inertia
- larger-frame stability
- better component protection
- very low AUW
- extreme 1S thrust-to-weight
In short:
A 1S 2-inch toothpick with 5-inch attitude.
Most 2-inch toothpick frames are around 85 mm motor-to-motor. They are compact, light, and responsive, but can also feel twitchy and nervous at speed.
This frame uses a larger 96 mm wheelbase, while still staying extremely light. The larger wheelbase gives the quad more mechanical leverage, more stability, better component protection, and a less twitchy feel.
At the same time, the quad still uses:
- high-KV 1002 motors
- 2-inch lightweight bi-blade props
- very low prop inertia
- low AUW
- 1S power
This keeps the quad extremely responsive and punchy.
The design goal is:
2-inch responsiveness
+
high-KV punch
+
96 mm locked-in frame feel
=
responsive, stable, aggressive 1S micro quad
| Item | Specification |
|---|---|
| Class | 1S 2-inch toothpick |
| Frame wheelbase | 96 mm |
| Typical 2-inch frame reference | ~85 mm |
| Frame material | Carbon fiber |
| Frame thickness | 2 mm |
| Frame area | ~1258 mm² |
| Estimated frame weight | ~3.8–4.0 g |
| Motors | 1002 high-KV brushless |
| Planned KV | 25000KV |
| Alternative KV | 22000KV |
| Motor weight | ~2.5 g each including wires |
| Props | Gemfan GF2015 bi-blade |
| Prop size | 2.0 inch |
| Experimental prop size | 2.2 inch low pitch |
| Battery | 1S LiHV, LAVA 580 mAh |
| Estimated dry weight | ~25–26 g |
| Estimated AUW | ~39–40 g |
| Estimated thrust | ~400–412 g total |
| Estimated thrust-to-weight | ~10:1 |
| Component | Estimated Weight |
|---|---|
| 2 mm carbon frame | ~3.8–4.0 g |
| 4x 1002 motors, including wires | ~10.0 g |
| Canopy | ~0.55 g |
| Camera | ~1.5 g |
| FC AIO | ~4.0 g |
| Battery connector + wires | ~2.0 g |
| 4x Gemfan GF2015 bi-blade props | ~2.0 g |
| 12x M1.4 motor screws | ~0.5–0.8 g |
| 4x FC rubber grommets | ~0.2–0.4 g |
| 4x M2 FC screws | ~0.4–0.8 g |
| 4x 3D printed motor dampers | ~0.1 g |
| 3D printed FC protector | ~0.2 g |
Estimated dry weight without battery:
~25–26 g
With a LAVA 1S 580 mAh LiHV battery:
~39–40 g AUW
The final frame area is approximately:
1258 mm²
Frame thickness:
2 mm
Volume:
1258 mm² × 2 mm = 2516 mm³
Convert to cubic centimeters:
2516 mm³ = 2.516 cm³
Using a typical carbon fiber composite density of roughly 1.5–1.6 g/cm³:
2.516 cm³ × 1.5 g/cm³ = 3.77 g
2.516 cm³ × 1.6 g/cm³ = 4.03 g
Estimated frame weight:
~3.8–4.0 g
This is extremely light for a 96 mm frame that can support larger-than-normal 2-inch prop options.
Most normal 2-inch toothpick frames are around 85 mm. This frame is larger at 96 mm, which gives several advantages.
A quad controls roll and pitch by creating thrust differences between motors. The motors act at a distance from the center of gravity.
The basic relationship is:
torque = force × arm length
Or, for a quad:
roll/pitch torque = thrust difference × motor distance from center
Compared to an 85 mm frame:
96 / 85 = 1.129
This means the 96 mm frame gives about:
~13% more motor leverage
So for the same thrust difference, the motors have more mechanical advantage for roll and pitch corrections.
In practice, this should make the quad feel:
- more controlled
- more locked-in
- less nervous
- better at correcting attitude
- more stable during fast direction changes
Very small 2-inch frames can feel extremely sharp, but also twitchy. The motors are close to the center, and the quad has low rotational inertia.
A slightly larger frame increases the rotational inertia of the quad. That means the quad resists unwanted angular changes a bit more.
The basic relationship is:
angular acceleration = torque / moment of inertia
Or:
α = τ / I
A higher moment of inertia makes the quad less twitchy and more predictable.
This does not mean the quad becomes slow, because the powertrain still uses small 2-inch props and high-KV motors. The frame calms the body down, while the motors and props keep the response fast.
The result should be:
less twitchy than a normal 2-inch
but still much more responsive than a 3-inch
The longer arms help protect the important electronics.
Because the motors and arms sit farther away from the center stack, the frame creates a larger physical protection zone around:
- FC
- camera
- canopy
- wiring
- battery connector
- battery area
In crashes, the arms and motor area are more likely to take the first impact instead of the electronics.
This is especially useful on a very light quad, because the frame acts like a protective perimeter around the sensitive parts.
The larger frame allows more prop flexibility than a normal compact 2-inch frame.
Supported / possible prop sizes:
| Prop Size | Status |
|---|---|
| 2.0 inch | Recommended |
| 2.2 inch low pitch | Good experimental option |
| 2.4 inch | Possible, but KV-dependent |
| 2.5 inch | Experimental, KV-dependent |
The frame is designed to physically allow larger prop options, but the main build philosophy is still focused on keeping prop inertia low.
The design is based on a clear trade-off:
Do not use the largest prop possible.
Use the largest useful performance while keeping response extremely fast.
Large props can give more efficiency, more glide, and more float, but they also have more rotational inertia.
More prop inertia means:
- slower spool-up
- slower spool-down
- less immediate throttle response
- more motor load
- more voltage sag
- more heat
- less direct stick feel
This quad avoids the slow prop-spool feeling that can happen on larger 1S 3-inch builds.
Instead, the preferred setup is:
high-KV 1002 motors
+
lightweight 2-inch bi-blade props
+
larger 96 mm frame
This gives:
- fast prop response
- high RPM
- strong punch
- low prop inertia
- stable frame geometry
- locked-in feel
- less twitchy behavior
In short:
Small prop for response.
High KV for punch.
Large frame for stability.
The motor size used in this build is 1002.
This means approximately:
10 mm stator diameter
2 mm stator height
A 1002 motor is very small and light. The benefits are:
- low motor weight
- low rotor inertia
- fast throttle response
- fast RPM changes
- very direct feel
- excellent for ultralight 1S builds
The downsides are:
- limited torque
- limited thermal mass
- limited continuous power
- high current draw at high KV
- easy to overload with large props
A 1002 motor is not meant to spin large 3-inch props aggressively. It is best suited for small, lightweight props where response matters more than cruise efficiency.
This build uses a 1S battery, so voltage is limited.
Typical voltage:
Nominal 1S LiPo: 3.7 V
Full 1S LiHV: 4.35 V
Motor no-load RPM is roughly:
RPM = KV × voltage
For 25000KV:
25000 × 3.7 V = 92,500 RPM no-load
25000 × 4.35 V = 108,750 RPM no-load
For 22000KV:
22000 × 3.7 V = 81,400 RPM no-load
22000 × 4.35 V = 95,700 RPM no-load
These are no-load values. With a prop attached, real loaded RPM is much lower because of:
- prop load
- voltage sag
- motor torque limits
- battery current limit
- ESC losses
- aerodynamic drag
Realistic loaded RPM for the 25000KV 2-inch setup is expected to be around:
~45,000–60,000 RPM
This is still extremely high for a micro quad and is one of the reasons the build should feel very aggressive.
Propeller load increases very quickly with diameter.
A simplified rule is:
prop power demand ∝ diameter^4 to diameter^5 × RPM^3
This means a small increase in prop diameter can create a much larger increase in motor load.
Using 2.0 inch as a baseline:
| Prop Size | Diameter Ratio | Load Estimate Using D⁴ | Load Estimate Using D⁵ |
|---|---|---|---|
| 2.0" | 1.00x | 1.00x | 1.00x |
| 2.2" | 1.10x | 1.46x | 1.61x |
| 2.4" | 1.20x | 2.07x | 2.49x |
| 2.5" | 1.25x | 2.44x | 3.05x |
| 3.0" | 1.50x | 5.06x | 7.59x |
This explains why 2.4–2.5 inch props can become questionable on 25000KV 1002 motors.
Even if the prop physically fits, it may not make sense electrically or dynamically.
Responsiveness depends heavily on prop inertia.
The motor has to accelerate and decelerate the prop. For rotation:
angular acceleration = motor torque / rotational inertia
Or:
α = τ / I
A prop with lower rotational inertia can change RPM faster.
Prop inertia roughly depends on:
I ≈ m × r²
Where:
m= prop massr= prop radius
A larger prop has more radius and usually more mass, so inertia increases quickly.
Compared to a 2-inch prop, a 3-inch prop has:
3 / 2 = 1.5x diameter
Radius effect alone:
1.5² = 2.25x inertia
But because the 3-inch prop is also heavier, real inertia can be several times higher.
That is why a 3-inch 1S quad often feels more floaty and less immediate.
This build avoids that by using small, lightweight bi-blade props.
Bi-blade props are preferred for this build.
Compared to tri-blades, bi-blades usually have:
- lower weight
- lower rotational inertia
- faster spool-up
- faster spool-down
- lower current draw
- better efficiency
- less voltage sag
- less motor heat
- longer flight time
On a high-KV 1S build, this matters a lot.
The motors are already spinning very fast and drawing high current. A heavier tri-blade would increase the load, reduce efficiency, create more sag, and make the motors run hotter.
The preferred prop style is:
lightweight low-pitch bi-blade
Recommended options:
| Prop Type | Recommendation |
|---|---|
| 2.0" bi-blade | Best match |
| 2.2" low-pitch bi-blade | Good experimental option |
| 2.4" bi-blade | Better suited for lower KV |
| 2.5" bi-blade | Experimental, lower KV preferred |
| Tri-blade | Not preferred |
The main prop choice is:
Gemfan GF2015 bi-blade
This is a:
2.0 inch diameter
1.5 pitch
2-blade prop
This prop fits the design goal well:
- low mass
- low inertia
- fast spool
- good thrust
- good efficiency
- high RPM capable
- suitable for aggressive 1S setups
The GF2015 is the main recommended prop for the 25000KV setup.
Known/expected thrust on GF2015:
| Motor KV | Thrust Per Motor | Total Thrust |
|---|---|---|
| 22000KV | ~93 g | ~372 g |
| 25000KV | ~103 g | ~412 g |
Difference per motor:
103 g - 93 g = 10 g
Difference total:
10 g × 4 motors = 40 g
Relative difference:
103 / 93 = 1.108
So 25000KV gives about:
~11% more thrust
The trade-off is that 25000KV will likely have:
- higher current draw
- more voltage sag
- more heat
- shorter flight time
- more aggressive throttle response
The 22000KV version is still extremely strong, but easier on the battery and electronics.
Estimated AUW:
~39–40 g
With 25000KV motors on GF2015:
~103 g thrust per motor
Total thrust:
103 g × 4 = 412 g
Thrust-to-weight:
412 g / 40 g = 10.3:1
With 22000KV motors on GF2015:
93 g × 4 = 372 g
Thrust-to-weight:
372 g / 40 g = 9.3:1
Estimated thrust-to-weight comparison:
| Setup | Total Thrust | AUW | T/W |
|---|---|---|---|
| 22000KV + GF2015 | ~372 g | ~40 g | ~9.3:1 |
| 25000KV + GF2015 | ~412 g | ~40 g | ~10.3:1 |
Both are extremely powerful for a 1S micro quad.
The 25000KV setup can draw around:
~12 A per motor
Total current at full throttle:
12 A × 4 = 48 A
This is a lot for a 1S battery.
The LAVA 1S 580 mAh battery is a high-discharge pack, but full throttle is still a very heavy load for a single cell.
Expected behavior:
- short punch-outs should be possible
- long full-throttle runs are not recommended
- voltage sag is expected
- motor temperature should be checked
- ESC temperature should be checked
- battery temperature should be checked
- connector and wire temperature should be checked
Because the quad has such a high thrust-to-weight ratio, full throttle should rarely be needed.
This is important:
The quad has more power than it usually needs.
The battery only sees peak load during short bursts.
The frame can physically support props larger than 2 inches, but the motor and KV choice determine what actually makes sense.
| Motor KV | Prop Size | Recommendation |
|---|---|---|
| 25000KV | 2.0" bi-blade | Ideal |
| 25000KV | 2.2" low-pitch bi-blade | Good experimental option |
| 25000KV | 2.4" bi-blade | Borderline / risky |
| 25000KV | 2.5" bi-blade | Not recommended |
| 22000KV | 2.0" bi-blade | Safe |
| 22000KV | 2.2" bi-blade | Good |
| 22000KV | 2.4" bi-blade | Testable |
| 22000KV | 2.5" bi-blade | Experimental |
| 1002 any KV | 3.0" | Not recommended for this concept |
A 3-inch 1S build can be efficient, floaty, and smooth, but that is not the goal of this quad.
A 3-inch prop has much higher inertia and much higher load. It will not spool as quickly as a 2-inch prop.
The result is often:
- more glide
- more float
- better cruise efficiency
- slower response
- more lazy throttle feel
- less sharp stick response
This build is designed to avoid that.
The goal is not maximum prop size.
The goal is:
maximum useful thrust
with minimum prop inertia
and maximum response
This is why the frame may physically support larger props, but the recommended setup stays around 2.0–2.2 inches.
A 1S 3-inch 1202.5 build usually uses:
- larger motors
- larger props
- lower KV
- more prop disc area
- more glide
- more efficiency at cruise
- more floaty flight feel
This build uses:
- smaller motors
- higher KV
- smaller props
- lower prop inertia
- lower AUW
- faster response
- more punch per gram
Comparison:
| Characteristic | This 2" 1002 Build | 1S 3" 1202.5 Build |
|---|---|---|
| Prop response | Very fast | Slower |
| Prop inertia | Low | Higher |
| Punch feel | Very aggressive | Strong but softer |
| Glide | Lower | Higher |
| Cruise efficiency | Good, but not main goal | Better |
| Stick feel | Sharp/direct | Smoother/floatier |
| AUW | ~39–40 g | Often ~50–60 g |
| Frame feel | Locked-in but responsive | Stable and floaty |
| Main goal | Response and punch | Efficiency and glide |
The 3-inch build may be better for relaxed cruising and longer flight time.
This 2-inch build should be better for:
- fast reaction
- punch-outs
- tight control
- quick direction changes
- aggressive flying
- low prop-spool delay
The expected flight feel is:
sharp
responsive
punchy
locked-in
less twitchy than a normal 2-inch
more aggressive than a 3-inch 1S cruiser
Expected characteristics:
- very fast throttle response
- minimal prop spool delay
- strong punch-outs
- high-pitched motor sound
- very low mass
- fast direction changes
- less twitchy than compact 2-inch frames
- more stable than typical 85 mm 2-inch frames
- less float than 3-inch 1S
- very high thrust-to-weight
- high current peaks
Because of the high KV and high RPM, this quad should have a very high-pitched sound.
It will not sound exactly like a 5-inch, because a 5-inch prop moves much more air and has a deeper sound.
However, the high RPM and fast spool should give this quad an aggressive micro scream.
Expected sound:
high-pitched
sharp
angry
fast spool-up
mini race-drone character
A realistic top speed estimate is:
~90–120 km/h
Higher peaks may be possible with:
- fresh LiHV battery
- good tune
- low drag build
- full throttle burst
- favorable wind
- clean prop condition
But top speed is not the main design goal.
The main design goals are:
- response
- punch
- control
- locked-in feel
- low AUW
The build uses four custom 3D printed motor dampers.
Per damper:
Area: 44 mm²
Thickness: 0.5 mm
Volume per damper:
44 mm² × 0.5 mm = 22 mm³
For four dampers:
22 mm³ × 4 = 88 mm³
Convert to cubic centimeters:
88 mm³ = 0.088 cm³
With typical 3D print material density around 1.2 g/cm³:
0.088 cm³ × 1.2 g/cm³ = 0.106 g
Estimated total weight:
~0.1 g
The motor dampers add almost no weight, but may help isolate vibration between the motors and frame.
The final FC protector area is:
347 mm²
Assuming 0.5 mm thickness:
347 mm² × 0.5 mm = 173.5 mm³
Convert to cubic centimeters:
173.5 mm³ = 0.1735 cm³
With 3D printed material around 1.2–1.27 g/cm³:
~0.21–0.22 g
Estimated FC protector weight:
~0.2 g
This is a very small weight penalty for extra protection.
Planned battery:
BETAFPV LAVA 1S 580 mAh LiHV
Estimated battery weight:
~14.1 g
Estimated AUW with this battery:
dry weight ~25–26 g
battery ~14.1 g
total ~39–40 g
This build should be strong in:
- throttle response
- punch
- fast RPM changes
- low prop-spool delay
- low AUW
- high thrust-to-weight
- control authority
- locked-in frame feel
- component protection
- aggressive 1S performance
The design is not optimized for maximum flight time or smooth cruising.
Expected trade-offs:
- high current draw
- voltage sag during hard punch-outs
- motor heat if over-propped
- battery stress at full throttle
- less glide than 3-inch
- less cruise efficiency than larger prop setups
- tune may need care because of high power and low mass
This is a performance-focused 1S build, not a relaxed cruiser.
When testing new props or motor KV combinations:
- Start with short hover tests.
- Check motor temperature after 20–30 seconds.
- Check battery temperature.
- Check ESC temperature.
- Do short punch-outs only.
- Watch voltage sag.
- Avoid long full-throttle runs at first.
- Review blackbox if available.
- Increase throttle load gradually.
- Stop testing if motors become too hot to touch.
Recommended first setup:
1002 25000KV
GF2015 bi-blade
1S LiHV
throttle limit optional
Optional safer initial Betaflight setup:
Throttle limit: 85–90%
This can reduce current spikes while still keeping the quad very fast.
Best match for the design goal:
1002 25000KV
GF2015 2-inch bi-blade
1S LAVA 580 mAh
96 mm carbon frame
~40 g AUW
This gives the most aggressive version of the concept.
More efficient / safer version:
1002 22000KV
GF2015 or 2.2-inch low-pitch bi-blade
1S LAVA 580 mAh
96 mm carbon frame
~40 g AUW
Experimental larger-prop version:
1002 22000KV
2.4-inch bi-blade
careful temperature testing required
Not recommended for the main goal:
25000KV + 2.5-inch
1002 + 3-inch
heavy tri-blades
long full-throttle runs
This quad is designed around a very specific theory:
Use the smallest prop that can still make serious thrust.
Use high KV to create punch and RPM.
Use low prop inertia to keep response instant.
Use a larger frame to make the quad less twitchy and more locked-in.
Keep the whole build extremely light.
The result should be a 1S quad that feels:
- much more responsive than a 3-inch 1S build
- less twitchy than a compact 2-inch build
- more locked-in than a normal toothpick
- extremely punchy for its size
- very light
- very aggressive
- very fun
In one sentence:
A 96 mm 1S 2-inch high-KV toothpick designed for instant response, extreme punch, and a larger-quad locked-in feel without the lazy spool of bigger props.
