INSANE FT Goblin!

[Mr Man]

I built an insanely powerful ft goblin just for fun. I also added some dihedral to the wings for added stability.

It’s running a 80a esc, spektrum receiver, 5x7.5 Apcprop, and a huge purple edf motor.

Battery: 850mah 3s/ 1300 4s.

Have not been able to fly it yet.

 

[JetCrafts]

damnnn

 

[Jo's squadron]

nice
Man get ready for some speeeeeeeeed

 

[Piotrsko]

Not necessarily, could convert all that power to noise

 

[FlyingWithRyan]

I know I had a goblin on a 6x4.5 prop with a 2750kv quad motor that would do 105 on 4s, this has to do around 120 no shot it doesn't. I know I was able to run a 2200 3s as well and that was within CG, think the 4s was a 1400.

 

[Mr Man]

nice
Man get ready for some speeeeeeeeed

Not necessarily, could convert all that power to noise

It did a little bit of both. Very fast on 3s, but I think 5x7.5 is a bit too much for a high rpm motor. Going to get a lower pitch prop.

 

[Mr Man]

Vid is out!

I was having some weird throttle issues on the maiden flight.🤔 My guess would be that I over-propped it.

 

[Mr Man]

I have a question. 5x5x2 apc prop, or 5x4x3 non apc prop?

 

[Piotrsko]

According to Hartzell, the 3 blade is better. According to me: maybe. Have a <ctl> <alt> <del> moment in your future figuring the new prop variables. Assuming you can make pitch the 5-4-3 will fly slower but load motor less. There's also a reason people lke APC.

 

[Mr Man]

According to Hartzell, the 3 blade is better. According to me: maybe. Have a <ctl> <alt> <del> moment in your future figuring the new prop variables. Assuming you can make pitch the 5-4-3 will fly slower but load motor less. There's also a reason people lke APC.

So if I want to go fast which one would you recommend? Or do you have any other suggestions?

 

[Mr Man]

One thing I will say is that it was VERY stable with the added dihedral.

 

[bisco]

man, that thing is a burner!

 

[FlyingWithRyan]

2 blade props do not provide as much static thrust most of the time, but offer a higher cruise speed as there is less form drag. For speed 2 blade is the only way to go. For climb and get up and go power 3 blade or 4 blade. There even was a company back in the old and bold days of general aviation that made a single blade prop for the Piper Cub to offer a couple mph faster cruse, but it didn't climb well and took a lot longer takeoff roll.

 

[Flying Cherokee]

I am currently building a ft f22 with a turnigy 1400kv motor, but seeing that it makes me want to make it faster. Though I am probably not quite ready for that kind of speed yet. Nice one Man!👍

 

[Mr Man]

2 blade props do not provide as much static thrust most of the time, but offer a higher cruise speed as there is less form drag. For speed 2 blade is the only way to go. For climb and get up and go power 3 blade or 4 blade. There even was a company back in the old and bold days of general aviation that made a single blade prop for the Piper Cub to offer a couple mph faster cruse, but it didn't climb well and took a lot longer takeoff roll.

2 blade it is.

 

[Mr Man]

There's also a reason people lke APC.

What is it?

 

[Mr Man]

Vid is out!

I was having some weird throttle issues on the maiden flight.🤔 My guess would be that I over-propped it.

It was also really windy.

 

[FlyingWithRyan]

What is it?

APCs are really good for low drag and high efficiency numbers. Theyre by far the best performing prop for small electrics. Master airscrews look like a boat oar in comparison.

 

[L Edge]

APC props is one of the few companies that provides technical and performance data for each prop they make whether it be for speed or acrobatic conditions. Especially if you are looking for top speed for a certain motor/prop combination.

 

[Piotrsko]

You use master airscrew when you get tired of installing a new prop per every flight or are flying combat.