CARBON FIBER DISCUSSION

[Zoom Master]

Use gorilla glue like @DamoRC does.

Wait a sec isn't he the guy who made that edf diamond jet ? And I didn't know u could even use that for foamboard.........

 

[Mr Man]

Yup, that’s the guy.

 

[Zoom Master]

Yup, that’s the guy.

Ohh okkk nice I really liked his foamboard diamond jet !

 

[Mr Man]

Yup, almost built it once.

 

[Zoom Master]

Yup, almost built it once.

Almost ?

 

[Zoom Master]

Yup, almost built it once.

Why didn’t u build it ?

 

[Mr Man]

Because I decided to do the Radjet instead.

 

[Zoom Master]

Because I decided to do the Radjet instead.

Oh ok makes sense.

 

[Zoom Master]

Because I decided to do the Radjet instead.

But would have been cool to see......maybe I can make one after I build my lazy lizard.

 

[Mr Man]

But would have been cool to see......maybe I can make one after I build my lazy lizard.

Yup, go for it!

 

[Zoom Master]

Yup, go for it!

Alright and im gonna but a 90mm edf on it !

 

[Zoom Master]

And also whats the difference between regular carbon and carbon with kevlar iv seen a lot of high speed rc boats made with carbon fiber and kevlar......

https://oxideanmarine.com/collections/rtr/products/the-beast-twin-cat-artr-rc-boat-carbon-kevlar

 

[Mr Man]

No clue 😂

 

[Mr Man]

Other than that one has Kevlar in it too….

 

[Houndpup Rc]

And also whats the difference between regular carbon and carbon with kevlar iv seen a lot of high speed rc boats made with carbon fiber and kevlar......

https://oxideanmarine.com/collections/rtr/products/the-beast-twin-cat-artr-rc-boat-carbon-kevlar

Ask and you shall receive, here I got this from ChatGPT:
Here's a breakdown of the differences between regular carbon fiber and carbon-Kevlar hybrid composites, especially in the context of high-speed RC applications like boats and airplanes:

---

🔹 Carbon Fiber (Regular)​

• Strength: Extremely strong in tension (pulling forces).
• Stiffness: Very stiff—great for structural rigidity.
• Weight: Very lightweight.
• Fragility: Brittle under impact—can crack or shatter suddenly.
• Vibration Dampening: Moderate.

🔹 Carbon/Kevlar Hybrid​

This is typically a woven fabric of carbon fiber and Kevlar fibers combined in a single sheet, often called “carbon-Kevlar weave” or “hybrid cloth.”

• Strength: Still very strong, though not quite as stiff as pure carbon.
• Toughness (Impact Resistance): Far better than carbon alone. Kevlar adds resistance to cracking, tearing, and delaminating—especially under impact or flex.
• Weight: Slightly heavier than carbon-only due to Kevlar’s density and volume.
• Vibration Dampening: Better than carbon alone—Kevlar absorbs shock and vibration better.
• Wear Resistance: Kevlar is highly abrasion-resistant, which can help extend the surface life of boats or exposed edges.

---

✅ Why High-Speed RC Boats Use Carbon-Kevlar​

• Boats hit water at high speed, and water is surprisingly brutal—especially at 70–100+ mph. Kevlar absorbs impacts and flexes instead of cracking like pure carbon might.
• Hull integrity is crucial: if a boat hits debris, water chop, or even flips, a Kevlar hybrid is less likely to fracture than straight carbon.
• Reduced vibration and resonance also helps protect electronics and improve control stability.

---

❌ Downsides of Carbon-Kevlar​

• More difficult to cut and machine—Kevlar frays and dulls tools.
• More expensive.
• Not as cosmetically clean—you can’t polish it to the same glossy perfection as pure carbon.

---

TL;DR​

Feature	Carbon Fiber	Carbon/Kevlar Hybrid
Stiffness	✅ Higher	⬅️ Slightly less
Impact Resistance	❌ Lower	✅ Higher
Weight	✅ Lightest	⬅️ Slightly heavier
Flexibility	❌ Brittle	✅ More forgiving
Best for…	Speed + rigidity	Speed + toughness

 

[telnar1236]

Ok let's say I make a perfect foamboard airplane...........the dream im talking perfect sharp edges completely even, Super aerodynamic design and a motor able to propel the airplane to 300 mph or faster. Question is what will hold the foam board together at that speed ? Wont glue start to melt at that temp although I dont know what temp my airplane will reach but lets say it reaches at the melting point of hot glue........what then ?

300 mph is slow enough that aerodynamic heating should not be a problem. If you use a turbine, you will need to keep the heat away from the foam or carbon fiber regardless since the exhaust is significantly hotter than resins can take, but your biggest challenges will be reducing drag and having a rigid enough structure.

 

[telnar1236]

And also whats the difference between regular carbon and carbon with kevlar iv seen a lot of high speed rc boats made with carbon fiber and kevlar......

https://oxideanmarine.com/collections/rtr/products/the-beast-twin-cat-artr-rc-boat-carbon-kevlar

The kevlar is there to help the hull hold together under impacts mostly. There's very little reason to use it in an rc plane. A good option to consider would be fiberglass however. It's cheaper than carbon fiber and should be plenty strong and light for your purposes.

 

[Zoom Master]

Ask and you shall receive, here I got this from ChatGPT:
Here's a breakdown of the differences between regular carbon fiber and carbon-Kevlar hybrid composites, especially in the context of high-speed RC applications like boats and airplanes:

---

🔹 Carbon Fiber (Regular)​

• Strength: Extremely strong in tension (pulling forces).
• Stiffness: Very stiff—great for structural rigidity.
• Weight: Very lightweight.
• Fragility: Brittle under impact—can crack or shatter suddenly.
• Vibration Dampening: Moderate.

🔹 Carbon/Kevlar Hybrid​

This is typically a woven fabric of carbon fiber and Kevlar fibers combined in a single sheet, often called “carbon-Kevlar weave” or “hybrid cloth.”

• Strength: Still very strong, though not quite as stiff as pure carbon.
• Toughness (Impact Resistance): Far better than carbon alone. Kevlar adds resistance to cracking, tearing, and delaminating—especially under impact or flex.
• Weight: Slightly heavier than carbon-only due to Kevlar’s density and volume.
• Vibration Dampening: Better than carbon alone—Kevlar absorbs shock and vibration better.
• Wear Resistance: Kevlar is highly abrasion-resistant, which can help extend the surface life of boats or exposed edges.

---

✅ Why High-Speed RC Boats Use Carbon-Kevlar​

• Boats hit water at high speed, and water is surprisingly brutal—especially at 70–100+ mph. Kevlar absorbs impacts and flexes instead of cracking like pure carbon might.
• Hull integrity is crucial: if a boat hits debris, water chop, or even flips, a Kevlar hybrid is less likely to fracture than straight carbon.
• Reduced vibration and resonance also helps protect electronics and improve control stability.

---

❌ Downsides of Carbon-Kevlar​

• More difficult to cut and machine—Kevlar frays and dulls tools.
• More expensive.
• Not as cosmetically clean—you can’t polish it to the same glossy perfection as pure carbon.

---

TL;DR​

Feature	Carbon Fiber	Carbon/Kevlar Hybrid
Stiffness	✅ Higher	⬅️ Slightly less
Impact Resistance	❌ Lower	✅ Higher
Weight	✅ Lightest	⬅️ Slightly heavier
Flexibility	❌ Brittle	✅ More forgiving
Best for…	Speed + rigidity	Speed + toughness

Hm alright.

 

[Zoom Master]

300 mph is slow enough that aerodynamic heating should not be a problem. If you use a turbine, you will need to keep the heat away from the foam or carbon fiber regardless since the exhaust is significantly hotter than resins can take, but your biggest challenges will be reducing drag and having a rigid enough structure.

Alright so I wont have any heat issues since it's a slow enough speed alright. And as for drag and a rigid structure im currently working on that !

 

[Houndpup Rc]

The kevlar is there to help the hull hold together under impacts mostly. There's very little reason to use it in an rc plane. A good option to consider would be fiberglass however. It's cheaper than carbon fiber and should be plenty strong and light for your purposes.

Yeah, if you crash this going 300mph it doesn't matter what it's made of....It 's GOING to break! 🤣 🤣 🤣