i didnt got any issue with these system, probably this was just a bad prop? give it another try
i use the gf4023x3 and the gf5125, the 4023 on both mount options and gf5125 should have a meeting with 5mm shaft soon :-)

the hq blades are much more stiff, special at the end of the blade. as i am looking for performance u struggle by tune biblades much more easy on triblades, performance should be better on biblades but i doesnt bring it there
i should check about an hq t-mount 5inch triblades

edit: should try these https://www.hqprop.com/hqprop-t51x25x3-g...p0278.html

Trying to do a 7 inch sub 250g is silly at best and a fools errand at worst.  

I see the draw to do a sub 250g 4, maybe 5 inch.  I'm even considering a 4 inch, not for sub 250g as I won't bow down to the man on this, but for a quad to keep in the truck when I'm out and about.  But for a 7inch that is silly.  First a 7 inch sub 250g won't be any better for LR than a 4 inch.  And a 7 inch platform isn't as good as a 4 or 5 inch for freestyle or racing.  So, this frame is more about Trappy trying to make money on the hype train.  If Trappy wants to impress me, make a 10 or 14 inch sub 250g that can do 10 miles round trip.  If that can be done I might pay attention.  Until then, I will watch what Harry, Kaity and others come up with for 3 and 4 inch LR rig.

the bh 2004 on 2s would be able to carry more than 250g uaw, i beleive the benefit would be if used with a 2s 4p liion or just a huge 2s lipo, 6000mah at 20c :-) it should be very very unresponsive xD but for flighttime?
shouldnt that give more flighttime than on a 4inch? someone like to do the math on ecalc?
i thought it could give benefits about flighttime regardless 250g or more.

when will we see a 7inch 1s settup xD

Some rough numbers...
Regardless of prop/frame/etc, 25g gone for FC, rx, vtx, power cable, etc

225g left. Lets assume half weight used for battery. 125g. So 100g left.

Why half? Even hyper alien efficient props wont go far on 25g battery. And conversely, 200g battery means no budget for anything.

Frame and motor and prop weight, proportional to size^2=area

frame = roughly 1.2*area
4" __________ 19g frame
5" +56% area 30g frame
6" +44% area 43g frame
7" +36% area 59g frame
8" +30% area 77g frame

lets say estimate of prop weight is area/10.. ie 5" = 2.5g
For 7", 4.9g per prop. How realistic is this?
HQ T5030 is 2.35g
GF 6026 is 3.0g
GF 7042 is 5.5g

So what remains per motor - what is "doable"?
4" 18g.. vs typical 10g for 1404.
5" 16g.. vs typical 16g for 2004 - no wonder this works well
6" 10g.. vs min 24g 2405.. we are way over
7" 5g.. well, obviously 1202 wont work on 7" 5g prop
8" -1g

But, YOU SAY, the battery is so big.
Even if we go down from 120g to 80g (you would need massive 50% more efficient to make up), That only frees up 10g per motor.

So you tell me which of these is worth sacrificing 33% battery capacity.. Which is 50% more efficient than 5":
20g motors on 6" prop
15g motors on 7" prop
9g motors on 8" prop - clearly impractical

Hi Roman,

Nice metrics. GOOD JOB      

For the BEAST build, I have a Racer-X Megabt 7 frame base that weights 66 grams and is pretty sturdy. However, the T-Motor Trick 2306 2400kv motors weigh 35 grams each with wires; that is 140 grams for the 4 motor set. So, this build is at 206 grams before adding the electronics, additional frame plate, hardware, props {yeah, the props are heavy as well...another 22 grams}. I will be lucky if I can keep the dry weight below 300 grams. On the other hand, I didn't really intend for this build to be sub-250 gram; I just wanted a decent 7 inch that might be capable of long distance. 

The Katarms-7LRx is a different matter. For this one, I am working for the lightest 7 inch that I can feasibly build even if it ends up being over 250 grams. Up to this point, I had planned to fabricate a custom frame...so that will be interesting. If I can get the total frame weight to 50 grams, well that would be nice. On the other hand, why not just buy one of those TBS 50 gram frames    The more I think about it, the more the TBS frame looks promising. 

Obviously, the 2306 motors have to go, but I think that I can "over prop" a lighter motor...maybe 2203's.    

Yeah, I know, this sounds a little sketchy {maybe foolish}, but hey, what have I got to lose     
Wouldn't that be a "Hoot" if I could build a sub 250 gram 7 incher that actually flies      
Nothing ventured, Nothing Gained, Right     This is all one big experiment, anyway. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  

Hi Krohsis, 

Yeah...I have always been a little eccentric and often play "outside the box". Let's see how these 7 inch builds go. 

"Wouldn't that be a "Hoot" if I could build a sub 250 gram 7 incher that actually flies"
without benefits in anyway - just to have 7inch blades - nooo, not for me. that wouldnt be nice, not a 250g uaw which flys would be nice. only a low weight 7inch which provide some benefits over a big and heavy 7inch would be nice in my eyes. low weight is nice so, sub 240, sub230 :-) even sub350g is still nice for a 7inch - if it makes sense in terms of benefits.

awaiting your ultralight 7inch and hoping for some benefits over traditional 7inch builds :-)

If I build it right, is should get pretty good Fly Times. 

(28-Jan-2021, 10:31 PM)iFly4rotors Wrote: If I build it right, is should get pretty good Fly Times. 

Harry, you build a 7 inch quad that will go 5k out and back, sub 250g and good HD video, I will eat a plate of crow.....but I'm not getting my salt and pepper out yet.

(29-Jan-2021, 12:11 AM)Krohsis Wrote: Harry, you build a 7 inch quad that will go 5k out and back, sub 250g and good HD video, I will eat a plate of crow.....but I'm not getting my salt and pepper out yet.

xD thats a word; plate of crow xD
what means "good hd video" a dji dvr as example? or just gopro quality footage?
hd footage makes it more difficult.

(29-Jan-2021, 01:01 AM)hugnosed_bat Wrote: xD thats a word; plate of crow xD
what means "good hd video" a dji dvr as example? or just gopro quality footage?
hd footage makes it more difficult.

GoPro footage is fine, but not with a GP 7,8,9, maybe a session 4  or 5.  I just don't think you will get enough frame rigidity to make clear HD video.

There is 1guy who built 7" ultralight under 250g auw.
Not sure its practical - ultra thin frame.

But,
Assuming you had featherlight T-mount 7" biblade - 5g??

With this 50g frame, are there **realistic** options to hit 250g AUW? After props and electronics, 150g left:
A) Tiny 50g battery, and OK 25g motors.
B) small 70g battery, and 20g motors
C) OK 100g battery, but 12g motors

Waitup.. hollup.. you say.
Whats wrong with 70g battery?

Nothing... ?
For long range - wont go as far as a 120g
For acro - well, both my 5" ultralights sag on 100g 850mah. So like 3x worse.

And this is being extremely generous on motors.

scaling..
15g motor for 5" is like:
9g for 4"
21g for 6"
25g for 7"

But, hey, what do I know...
Maybe they put 5G into the motors, like the masks.
Go and try it. Maybe a 1404 motor is enough for 7" props.

Hi Roman,

First, I will mention that Dave_C didn't log the fight distance that was traveled by each quad. I would be interesting to see the difference in distance traveled at similar throttle. But then, he is just getting started. Let's see what he ends up with.

Also, he mentioned a 7 inch T-Mount prop coming out. Now, if this new prop weighs a bit less than the current 7 inch props, we might have something.

Now, let's play the GAME of the Flywoo Explorer, BrotherHobby Hyperbola, and others.

The hype is basically the same AND the results are basically the same; That is:  

They all are purported to be sub-250 gram, Long Range (?), quads, BUT they are only sub-250 gram with a smallish {generally a 4S 650 mAh battery which actually weighs about the same as the 3S 1100 mAh GNB battery}. 

In order to get those long Fly Time, Long Range, flights; they have to strap on an 18650 pack {generally a 200 gram 4S pack} which blows that 250 gram weight right out of the water.

Well, we can play that game, too. 

If I can build a sub 250 gram 7 inch that will fly with a 4S 650 mAh or 3S 1100 mAh battery then I am going to call it sub-250 long range just like the other companies do. When I want sub 250 gram, I will use a small battery. On the other hand, when I want long range, I will strap on a "healthy" {translates to heavy} battery and see how long it will fly and how far I can go. Just like they do.

This build is definitely NOT in the challenge because you CAN  NOT  meet all three criteria at the same time with a 7 inch craft. 

Want to Play a Game ??     

Basically exactly what I said.

For 4", you have plenty leftover, because you are not forced to use big motors or heavy props.

For 5", you can squeeze in 100g battery.

Any bigger and you are either forced to put tiny motors or tiny battery. Either way, it will "fly", and even do flips and power loops. But you sacrified a lot of handling.


When *they* are done, Im sure it will be like 190-200g.
To stay under 250g, use a small 500mah 3S.

Exactly.

Even with 4 inch, you don't get long range and stay under 250 grams; at least not with the current production models and user builds.