300X weights

[Nelsonisms]

Originally Posted by DCflyer

Copy. At that point it may be worth going back to the stock length boom. But I read about your issues in another thread about the stretch not holding the tail due to Lynx not making longer tail blades. Since they are coming out with their OXY, Luca stated they are currently developing some carbon fiber 275mm blades. Hopefully they release some longer tails at that time as well. Thats the one reason I decided not to stretch which I could have easily done as I put it together from scratch.......no carbon 275's.

Aren't you tail heavy with the stretch and 1000mah packs?

Yeah, it' is a tiny bit tail heavy right now which is why I want to try out some 1300mAh 4S packs. That and I want to keep decent flight times if I increase the headspeed beyond 3600 RPM. If they work out I'll just relegate my 1000mAh 4S packs over to FPV groundstation duty so I can stop having to charge/transport 3S packs completely.

I've always been leary of the plastic blades. Even with the non-stretch plastics I was able to recognize a loss of efficiency between them and CF blades of the same length. Plus they flex a lot so they have a strange feel in the air that I don't really like.

I took my rebuilt 300X with me out to a fun fly yesterday. I didn't readjust the governor so I left it on 3600 RPM with the 245mm CF blades installed. Sure enough I couldn't get the tail to blow out no matter how much I gunned the collective. Yeah it had less pop on the collective but it wasn't all that bad unless I really wanted to push it hard. I had originally reset it with 12 degrees collective pitch and that felt soft, so I took it up to 13 degrees and that was better. In the past I'd ran it up to 14 degrees with these blades, so that's the next thing. I want to see how it does with 14 degrees of pitch at 3600 RPM. Otherwise I'll go up a pinion, increase the headspeed and drop the collective pitch back down around 13 degrees. The stretch boom with the 245mm blades didn't make the heli feel awkward, so I think I'll leave it on there for better tail hold and more flexibility to try out different main blades. If they ever do release some 275mm CF blades I'll give them a shot.

[xokia]

Originally Posted by ahahn

And so it will be heavier. No crime, but batteries add weight just like other components. They also can add flight time, and potential of higher current draw, if the setup tries to pull it.

If someone where looking to find out how much their 300x would weigh with X mods, they could weigh their own battery and add it to the heli weight to get the total weight. Giving the weight with the battery they have no way to know how much of that is battery and how much is heli the data becomes less useful IMO and becomes a who has the heaviest heli thread.

[Nelsonisms]

Alright my new batteries for "Porky" (named in homage to Uriah's Pookie ) arrived today. The only differences from the configuration below is that it now has Lynx 245mm CF main blades instead of the 275mm plastics and I'm going to run 1300mAh 4S packs. So...

AUW with 1300mAh 4S Battery = 711g = 1 lb. 9 oz.

Without Battery = 557g = 1 lb. 3 5/8 oz.

Nevertheless it now has perfect C.G.

Originally Posted by Nelsonisms

Mine is definitely the super heavyweight in this bout.

• Lynx Main Frame
• Lynx CF boom (stretch length)
• Lynx Ultra pushrod
• Lynx tail pitch lever/slider
• Lynx Swash
• Lynx Main Shaft
• Lynx OWB
• Lynx Slant Gear/Pinion
• Lynx boom supports/bracket
• Lynx FG protos style canopy
• Lynx 275mm plastic main blades
• Lynx 46mm plastic tail blades
• Align 450 tail hub
• Stock tail case & main grips.
• Gorilla gear skid brackets with Align 450 pipes
• Hyperion HS2216-2920kv 4S motor
• CC Ice Lite 50 ESC
• Turnigy 306G-HV servos all around
• TM1100 telemetry module
• Hobbywing RPM sensor
• AR7200BX
• Nano-tech 1000mAh 4S lipo

AUW (with battery) = 682g = 1 lb. 8 oz.

[DCflyer]

Originally Posted by Nelsonisms

Alright my new batteries for "Porky" (named in homage to Uriah's Pookie ) arrived today. The only differences from the configuration below is that it now has Lynx 245mm CF main blades instead of the 275mm plastics and I'm going to run 1300mAh 4S packs. So...

AUW with 1300mAh 4S Battery = 711g = 1 lb. 9 oz.

Without Battery = 557g = 1 lb. 3 5/8 oz.

Nevertheless it now has perfect C.G.

Jeez! Breaking 700 there. You're only 150g short of a 450 with 2200 pack! I'm not too far behind though. Did you come to any realizations over the weekend, headspeed-wise?

[Nelsonisms]

It's not terrible at 3500-3600 with 245mm blades and 13 degrees. Using the 4S power system seems to make up for the weight added and negates the need for the stretch blades. I think I will up the headspeed now that I've got some bigger packs and the weight has gone up, but that setup should be pretty decent for most people. Especially if yours weighs less than mine.

Just for comparison my stretch 450X weighs 718g (1 lb. 9 1/4 oz.) without the battery and 945g (2 lb. 1 1/4 oz.) with 1300mAh 6S packs. And the X5 weighs 2154g (4 lb. 11 7/8 oz.) without the battery and 2821g (6 lb. 3 1/2 oz.) with 4000mAh 6S packs.

Just doing some more math on those numbers. I wondered what is the ratio between the weight of the battery and the airframe between these three models.

300X = 4S 1300mAh battery = 154g = 27.65% of 557g
450X = 6S 1300mAh battery = 227g = 31.62% of 718g
X5 = 6S 4000mAh battery = 667g = 30.96% of 2154g

So you can see that the weight ratio of the battery on the 300X is still below that of the other two.

[DCflyer]

Oh wow I didn't realize that. Thanks for pointing that out.

That's good to hear that the 4S works well at that headspeed with 250mm blades. I will have to do some experimenting as well. My idle2 is set for 3650rpm now and I'm like 2% past the castle warning with a 13T pinion. If it's not enough I suppose I can try a 14t but the higher gear ratio on 13t will certainly provide the needed torque on a machine this heavy.

I was going to try it out this weekend but after installing the Lynx mainshaft I noticed so much play in the stock CFX swash that I had to replace that as well. Just went with Lynx since they are pretty much the same price. I've now replaced 95% of the original equipment. Blade quality FTW.

[ahahn]

Originally Posted by xokia

If someone where looking to find out how much their 300x would weigh with X mods, they could weigh their own battery and add it to the heli weight to get the total weight. Giving the weight with the battery they have no way to know how much of that is battery and how much is heli the data becomes less useful IMO and becomes a who has the heaviest heli thread.

Usually these things go the other way--how light is your hell--but then it is important to include the battery. Who knew it would be how porky can I fly

[DoubleCH]

The best is to post both numbers, AUW and dry weight (without battery). The extra typing and effort required to post both are way much less than the extra typing and effort required to argue here which representation is better. The only reason I can think of for not posting both is that they someone wants to boast the good number and hide the bad number.

[ahahn]

Originally Posted by DoubleCH

The best is to post both numbers, AUW and dry weight (without battery). The extra typing and effort required to post both are way much less than the extra typing and effort required to argue here which representation is better. The only reason I can think of for not posting both is that they someone wants to boast the good number and hide the bad number.

+1

I don't think people are hiding anything, the weights are taken in different ways. The reason I post the battery value is because it actually is a significant fraction of the total flying weight. But I have no other issue with other values, as long as the poster lets us know what he is including in the weight. I think that keeps us "honest"!