FTFC’25 MS Design SR - 71 Blackbird by Houndpup Rc

[Houndpup Rc]

Houndpup;

Advice:
You talked about using motors/prop also, did you see the review of this version of a SR-71. He talks about about stall condition for low speed so be aware of this condition. It ain't successful until it lands as a SR-71.
I hope you strengthen the wing including the outer segment past the ducting. It could fold in a sharp turn.
What are you using for foamboard?


When you launch, make sure you AOA is not to high or you will flip it. Add differential thrust so you have coordinated turns. You will need it.

Thanks @L Edge! I am going to be using DTFB, and will be adding aluminum spars to add strength in certain locations. I am still trying to figure out how I want to attach the nacelles right now.....What is AOA? I was thinking of adding flaps to help with landing and I want to be able to use props as a pusher or these edfs.

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[Houndpup Rc]

Hey @Mr Man these edfs are a really good price! and they only need a 30A esc.

H-King F-18 Super Hornet 588mm Replacement 4S 50mm 12 Blade Ducted Fan Unit w/Brushless Motor

The H-King (PNF) F-18 Super Hornet 588mm with gyro is a superb flier and is just right for flying or at your local R/C Club. Get yours and the full set of spares now at the best price.

hobbyking.com

 

[Jo's squadron]

Hey @Mr Man these edfs are a really good price! and they only need a 30A esc.

H-King F-18 Super Hornet 588mm Replacement 4S 50mm 12 Blade Ducted Fan Unit w/Brushless Motor

The H-King (PNF) F-18 Super Hornet 588mm with gyro is a superb flier and is just right for flying or at your local R/C Club. Get yours and the full set of spares now at the best price.

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Or these https://www.amazon.com/dp/B09FS4PY23/?tag=lstir-20

 

[Houndpup Rc]

Hey @Mr Man how do you get the skin to go outside the formers?

 

[Mr Man]

Hey @Mr Man how do you get the skin to go outside the formers?

I normally use the Thicken tool

 

[Houndpup Rc]

I normally use the Thicken tool

Okay I will try that later. Thanks!

 

[Mr Man]

Okay I will try that later. Thanks!

Yep!

 

[Houndpup Rc]

Okay I will try that later. Thanks!

Man! Loft is have a hard time on the back spot between the nacelles! how did you get the airfoil?

 

[Mr Man]

Man! Loft is have a hard time on the back spot between the nacelles! how did you get the airfoil?

I’ve never done a delta yet, but I did it similarly to how @Whit Armstrong did it in the video series I showed you a little while back.

 

[Houndpup Rc]

I’ve never done a delta yet, but I did it similarly to how @Whit Armstrong did it in the video series I showed you a little while back.

I will have to take a look at those.

 

[Mr Man]

I will have to take a look at those.

Here it is.

RC Air Corps

Share your videos with friends, family, and the world

www.youtube.com

 

[Houndpup Rc]

Here it is.

RC Air Corps

Share your videos with friends, family, and the world

www.youtube.com

Thanks!

 

[Mr Man]

Thanks!

Yup!

 

[Mr Man]

Thanks!

Just remember to take it with a grain of salt, your style will probably change as you progress.

 

[Houndpup Rc]

Just remember to take it with a grain of salt, your style will probably change as you progress.

Oh for sure! I have already wasted a whole bunch of time trying things and then decided I didn't like it. But that's how the best things are made!

 

[Mr Man]

Oh for sure! I have already wasted a whole bunch of time trying things and then decided I didn't like it. But that's how the best things are made!

Yup!

 

[Houndpup Rc]

Any ideas on where to put the battery box?

 

[Mr Man]

Any ideas on where to put the battery box?
View attachment 249529

Back of the nose?

 

[Houndpup Rc]

Back of the nose?

Not sure if that would make it too nose heavy...and it's really thin up there, I think it's like 1".

 

[Mr Man]

Not sure if that would make it too nose heavy...and it's really thin up there, I think it's like 1".

Just behind the nose? That'd be pretty close to CG.