Hi,

I'm a DJI pilot and want a decent indoor drone to freestyle with. I was considering the pavo pico and/or the cinelog 20 but they really are meant for more cinematic stuff.

Can someone let me know whether the A75 or A85 HD by iflight would be a better choice for indoor freestyle? I'm having a hard time deciding between the two. I want to practice mattyflips and trippy spins indoors before using my 5" but not sure about the PW ratio of these two. If there's a better option pls let me know. Thanks!

Just an update. I'm leaning towards the A75 and making the following mods. Pls let me know how you think it will fly.

Convert to naked vista
Add elrs ep2 receiver
Add Nebula pro nano camera

I think it’s going to be quite heavy for a 75mm, and I think that weight might make recovering from hard acro tricks inside difficult- but I could be wrong.
I do think the power to weight ratio is going to be lower than ideal. There’s only so much thrust you can make on the available 40mm props.

I’d probably lean more towards the 85mm, but, that’s a bit too big to fly inside a typical home.

(01-Aug-2023, 09:52 PM)Lemonyleprosy Wrote: I think it’s going to be quite heavy for a 75mm, and I think that weight might make recovering from hard acro tricks inside difficult- but I could be wrong.
I do think the power to weight ratio is going to be lower than ideal. There’s only so much thrust you can make on the available 40mm props.

I’d probably lean more towards the 85mm, but, that’s a bit too big to fly inside a typical home.

That was my dillema. The 85mm was a touch too big. I guess I'll see what happens after converting it to a naked vista. I think a naked vista isn't too much heavier than a typical analog VTX right?

Naked vista comes in at 9g.
Happymodel ovx300 comes in at 0.9g.

I’m sure it’ll fly just fine. I’ve got some fairly heavy 75mm builds. I did have to up my rates so that I could finish spinning and rolling before I smacked into the ground though.

You might just have to be heavier on the throttle, and it may not have the “pop” that you can get out of a lighter 75mm.

Edit- I’m also a crap pilot, so, keep that in mind.

(02-Aug-2023, 12:19 AM)Lemonyleprosy Wrote: Naked vista comes in at 9g.
Happymodel ovx300 comes in at 0.9g.

I’m sure it’ll fly just fine. I’ve got some fairly heavy 75mm builds. I did have to up my rates so that I could finish spinning and rolling before I smacked into the ground though.

You might just have to be heavier on the throttle, and it may not have the “pop” that you can get out of a lighter 75mm.

Edit- I’m also a crap pilot, so, keep that in mind.

Oh wow. I guess I'm not used to thus weight class at all. Crazy. Well I'll give it a go and see. If anyone has experience with the A75 let me know.

A naked vista with nebula pro nano is more like 15g. A typical 75mm analog whoop is 20g or less, or 35g if you add the 1S battery. That compared to the A75 which will be over 100g with a 3S lipo (3x the weight). If you have the skills, I guess you can freestyle the A75, but I would imagine it is much easier to learn freestyle indoors with a 1S whoop and worry less about damaging the drone or anything in the house.
For the price of an A75, you can get an analog whoop plus an analog adapter for your goggles, which might be another option to consider. Analog video doesn't compare to digital, but for indoor use and for practicing it does pretty ok.

(02-Aug-2023, 03:05 AM)mstc Wrote: A naked vista with nebula pro nano is more like 15g. A typical 75mm analog whoop is 20g or less, or 35g if you add the 1S battery. That compared to the A75 which will be over 100g with a 3S lipo (3x the weight). If you have the skills, I guess you can freestyle the A75, but I would imagine it is much easier to learn freestyle indoors with a 1S whoop and worry less about damaging the drone or anything in the house.
For the price of an A75, you can get an analog whoop plus an analog adapter for your goggles, which might be another option to consider. Analog video doesn't compare to digital, but for indoor use and for practicing it does pretty ok.

I figure if I stay with the polar vista, naked caddx vista, and maybe shave a couple of grams with a new antenna - I can get the quad down to 55 grams without the battery (+42 grams with battery) for a total of 97 grams. Not sure I can get much lower than that.

Think the extra weight will be compensated for by the 3S 8000 KV 1103 motors? I did a quick power to weight comparison based on 139 grams of max thrust per motor (Xing 1103 8000 KV) and it came out to 5.732:1. Not sure what a normal thrust to weight ratio should look like so please enlighten me if possible. I'd like to know how poor the performance may be.

Looking at the datasheet for those motors, 139g thrust is with 65mm props.

You’ll be using 40mm, which is 93g thrust at 100% throttle (with unnamed 40mm tri-blades), which will put you at a 3.84:1 power to weight ratio @ 97g auw, which is pretty low.

Ideally, I’d be shooting for a *minimum* 5:1 power to weight ratio.

Edit- It’ll fly, but it’s a bit of a chonker, and probably won’t be very agile. I’d expect your throttle hover point would be close to 40% (35%+), which might give you an idea of the lack of power. I’d expect it to struggle to pull out of a quick drop unless you had plenty of room before it hit the ground.

(02-Aug-2023, 06:18 AM)Lemonyleprosy Wrote: Looking at the datasheet for those motors, 139g thrust is with 65mm props.

You’ll be using 40mm, which is 93g thrust at 100% throttle (with unnamed 40mm tri-blades), which will put you at a 3.84:1 power to weight ratio @ 97g auw, which is pretty low.

Ideally, I’d be shooting for a *minimum* 5:1 power to weight ratio.

Edit- It’ll fly, but it’s a bit of a chonker, and probably won’t be very agile.

Thanks for the clarification. I guess I'll play with it and see what happens. Looking at the pics it looks like I might be able to fit slightly larger props. Maybe I'll see if I can squeeze a 2in on it or maybe the 1636 4 blade instead of 3. Still won't be super agile it would seem but it may help.

Let us know how it goes!

If you can squeeze larger props into it, that would definitely help.

(02-Aug-2023, 06:32 AM)Lemonyleprosy Wrote: Let us know how it goes!

If you can squeeze larger props into it, that would definitely help.

Will do!

(02-Aug-2023, 06:18 AM)Lemonyleprosy Wrote: Looking at the datasheet for those motors, 139g thrust is with 65mm props.

You’ll be using 40mm, which is 93g thrust at 100% throttle (with unnamed 40mm tri-blades), which will put you at a 3.84:1 power to weight ratio @ 97g auw, which is pretty low.

Ideally, I’d be shooting for a *minimum* 5:1 power to weight ratio.

Edit- It’ll fly, but it’s a bit of a chonker, and probably won’t be very agile. I’d expect your throttle hover point would be close to 40% (35%+), which might give you an idea of the lack of power. I’d expect it to struggle to pull out of a quick drop unless you had plenty of room before it hit the ground.

Out of curiosity. Where did you find the datasheet? I can't find it.

(02-Aug-2023, 07:21 AM)dwije21 Wrote: Out of curiosity. Where did you find the datasheet? I can't find it.

I’m pretty good at hunting them down. Usually if you do a google image search for a motor and scroll down a bit, you’ll find what you’re looking for. Sometimes you need to add more or less info to narrow it down.

(02-Aug-2023, 07:26 AM)Lemonyleprosy Wrote: I’m pretty good at hunting them down. Usually if you do a google image search for a motor and scroll down a bit, you’ll find what you’re looking for. Sometimes you need to add more or less info to narrow it down.

Thanks so much! Curious, if I use 4 blade prop instead of 3 blade can I do the following math (assuming pitch is the same) -

93 / 3 blades = 31 * 4 blades = 124g for a 4 blade prop of eqivalent pitch? (There's a 1636 by 4 blade vs the 1635 by 3 blade it comes with). That would be closer to a 5:1 ratio.

Or is that too simplistic to estimate thrust without a thrust stand?

Also let me know what you think of trying 4S instead of 3S.