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HelicopterMain Discussion › Weight of a 90 size helicopter.
06-03-2010 10:33 PM  7 years agoPost 1
thenewguy

Elite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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I'm trying to figure out if I'm in the right ball park. I have done a lot of changes to get the weight down on my Synergy. I know that they are normally a heavy helicopter. Just wanted to compare it to other 90 size heli's

My Synergy weighs 10lb 5 ounces with canopy ready to fly. No fuel.

I have plans to shave a couple more ounces off to try to get it at 10 lbs.

Can others chime in with their 90 size heli weight. I don't care what brand it is. Look for a wide range of brands.

Thanks Chris

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06-03-2010 10:45 PM  7 years agoPost 2
GimbalFan (passed)

rrProfessor

Big Coppitt Key, FL

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Anything nearing 10 lb is quite light for a 90. Lightening much below that -- of the frame or other stiffening components anyway -- will allow a well-tossed heli to flex so much that critical bearings will quickly fail. And when you're nearing 10 lbs all up, crash survivability has long since flown the coop.

I've done nothing to lighten my 90 nor any other birds. It wouldn't affect my enjoyment of flying 'em enough to bother.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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06-03-2010 11:33 PM  7 years agoPost 3
mlucia

Key Veteran

Essex Jct., Vermont

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My flybared trex 700 is 9 pounds 15.8 oz. Without fuel

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06-03-2010 11:43 PM  7 years agoPost 4
OICU812

rrMaster

Edson, Alberta, Canada

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Most recent build..

TDR 12S is 10.1 lbs, complete ready to fly with Lipos (2) x Thunder Power 5000mah Pro Power 30C installed.

If a heli is designed well for frame structure 10 lbs is IMO a nice weight, 12lbs way to heavy, you can even feel it at 11.2 and up. Each to their own I suppose. Have not weighed it yet with tp45C 4500 packs, but suspect it will be about 200-220 grams less.

...Once upon a time there were Nitros, flybars and frequency pins...

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06-03-2010 11:47 PM  7 years agoPost 5
airboss

Elite Veteran

OC ,california

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I had the N9 with the QX carbon frameset and it weighed in at 9.6 lbs
it was very light and kicked Trex butt ! all my other N9s were with OEM frame sets and weighed in at 11 lbs

Urukay HPS3 KSE 700 HPS3

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06-03-2010 11:50 PM  7 years agoPost 6
thenewguy

Elite Veteran

Corvallis, Oregon Where there is liquid sunshine!

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Cool,
Keep it coming guys. I appreciate the information.

Chris

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06-03-2010 11:56 PM  7 years agoPost 7
GimbalFan (passed)

rrProfessor

Big Coppitt Key, FL

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10 lbs is IMO a nice weight, 12lbs way to heavy, you can even feel it at 11.2 and up. Each to their own I suppose.
Certainly the guys who compete for prize dough or trophies have cause to fly light, but one minor gain from flying slightly heavier machines (my 90 = 10.9 lbs) is that blade thwõp volume is slightly louder, and lasts slightly longer.

I likes me some loud thwõp.

LOUD thwõp!

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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06-04-2010 01:05 AM  7 years agoPost 8
ch-47c

Elite Veteran

san jose, ca

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10lbs was the right weight for a .60 size heli. Granted their ability to flop around is't as snappy as a .90 size, but that's why they use the bigger motor and increase the disk area and boom length to compensate for the increase in power.

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06-04-2010 02:16 AM  7 years agoPost 9
max232

Veteran

Pensacola

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Just checked the rappy.....And now... weighing in at 11.4lbs
or 0.814285 stone. the heavyweight champ

gotta love the loudness of the thwop.

dont mind the goofy humor i had me an adult beverage after the day i had at work

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06-04-2010 02:24 AM  7 years agoPost 10
GimbalFan (passed)

rrProfessor

Big Coppitt Key, FL

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i had me an adult beverage after the day i had at work
Hopefully it was a LIGHT beer.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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06-04-2010 02:59 AM  7 years agoPost 11
airboss

Elite Veteran

OC ,california

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it was a beer served by a stripper.

Urukay HPS3 KSE 700 HPS3

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06-04-2010 10:36 PM  7 years agoPost 12
dahld

Key Veteran

Bakersfield, CA, USA

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I sure wish everyone that posted heli weights would use a weight "with fuel, blades, canopy-on and ready-to-fly". Apples-to-apples. Guys have a tendency to "fudge" in an advantages direction (-:

There also tends to be a tendency for wet powered models to post their weights "less fuel", as if it would fly like that. But electrics are usually demanded to post weights battery installed (because they are ridiculous light without the batteries). Again, I like apples-to-apples (-:

So, here's our "700" class facts: Mikado Logo 600SE (a 700 class heli swinging 690 blades), 9 pounds 8 ounces, "ready-to-fly".

(-: Dave

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06-04-2010 10:54 PM  7 years agoPost 13
Andy from Sandy

Elite Veteran

Bedfordshire, UK

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I sure wish everyone that posted heli weights would use a weight with fuel.
The metric system works great for this. The tank on a T-Rex 700 is 630cc. That is the same as 630milli-litres which is the same as 0.630Kg and 2.2046lbs = 1Kg. Therefore you would add 1.3889lbs to the dry weight of a 700 to get its flying weight at the beginning of the flight.

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06-04-2010 10:59 PM  7 years agoPost 14
Shawn Behrens

Senior Heliman

DEEP IN THE BOG

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Of course if you wanted apples to apples comparison to an E 90 you only need a splash of fuel for 4-5 minutes.
2 sides to everything

shawn

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06-05-2010 02:16 AM  7 years agoPost 15
dahld

Key Veteran

Bakersfield, CA, USA

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sbmon,

You are absolutely correct . Most electric 700 class helis flown at their max performance potential get 5 minutes or less. So a nitro .90 with only 5 minutes of fuel on board would be lighter for sure. Each is different (look at all the previous threads abounding about which is supposed to be better).

Just to keep the friendly bantering up though , if I was to lower the head speed and collective pitch on Kyle's Logo 600SE so it was as doggy (by comparison) as a nitro 90, we'd see 6-7 minutes.

Even still, for the same level of flight performance, the nitro 90 has the E90 in flight time . That's something us electric types will have to live with for awhile still, at least until the next technology break-thorough happens. But an electric 700 uncorked does put a nitro .90 in its place. But flight time suffers by comparison (-:

But in the end, fly what you enjoy, and to heck with all the over opinionated types out there on both sides .

Dave Dahl

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06-05-2010 11:40 PM  7 years agoPost 16
Justin Stuart (passed)

rrMaster

Plano, Texas

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How much do the modified Trex 700E's weigh (like the Suzi Hans build for example).

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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