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T-REX 700 › Trex 800 tail upgrade
01-29-2012 04:27 AM  6 years agoPost 1
devens2448

rrApprentice

Pekin, Il

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I found this on Helidirect's site. Didn't know this upgrade existed. There are a set of Align 800 3G blades on there too.I wonder what kind of setup you need to spin those.

http://helidirect.com/align-800-upg...f3c-p-23689.hdx

AMA #4978 Member Christian County Prop Busters, Champaign Co. RC, Pekin RC

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01-29-2012 06:50 AM  6 years agoPost 2
Terrabit

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Seattle, WA - USA

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Old news. Just gear for 1600-1900.

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01-30-2012 04:06 PM  6 years agoPost 3
Richardmid1

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Leeds, England

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Would have done the conversion if the heli would fit in my car!

60% of the time, it works every time!

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02-01-2012 05:03 AM  6 years agoPost 4
Stephen Born

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USA

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Richard, just take the tell off.

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02-01-2012 10:42 AM  6 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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Thats would mean re-loctiting the boom supports at the field and waiting for the loctite to cure!

60% of the time, it works every time!

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02-01-2012 12:57 PM  6 years agoPost 6
The Old Guy

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UK Surrey

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Stop making excuses, do the conversion and put it in the car at an angle, it is a great addition (and a cheap one)to your 700e
I converted a N to E and fitted the 800 kit and flys great

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02-01-2012 10:11 PM  6 years agoPost 7
Richardmid1

rrProfessor

Leeds, England

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Whats a good head speed to use for 3d with 800 blades then? 1700?

What about tail authority, need longer tail blades?

60% of the time, it works every time!

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02-01-2012 10:24 PM  6 years agoPost 8
Stephen Born

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USA

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I have a T-Rex 700e stretched to an 800 and use 105 tail blades. The longer boom assists in tail stability. I use it for AP, not 3D.

My HS is 1700.

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02-02-2012 02:17 AM  6 years agoPost 9
Stephen Born

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USA

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Here are a few pics of my T-Rex 800 tailboom. The original 700 boom is 31 inches long. The 800 is 35 inches long.

I am actually building the T-Rex 800 cameraship on the AP forum.

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02-02-2012 03:33 PM  6 years agoPost 10
Richardmid1

rrProfessor

Leeds, England

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Is there an increased chance of a boom strike doing the 800 stretch due to the extra flex in the blades and boom?

60% of the time, it works every time!

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02-02-2012 03:39 PM  6 years agoPost 11
Stephen Born

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USA

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Richard, it has a lot to do with weight. Align sells the 800mm blade, but it weights only 220 grams each. I just purchased Max Joker 800mm blades and they weigh 240 grams each. Significant difference. The blades are "pulled" as the they turn. The longer and lighter they are, the more flex.

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02-02-2012 04:00 PM  6 years agoPost 12
The Old Guy

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UK Surrey

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Personaly i feel that doing 3D with 800mm blades is going to be hard on battery & motor.
as my handel implies, i am only a sport flyer anyway.

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02-02-2012 04:14 PM  6 years agoPost 13
Stephen Born

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USA

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The Old Guy,

Again, there are many factors when you chose 800mm blades. Before you chose, you need to ask yourself what is your flying style. Myself, I chose the 800mm weighted blades just for aerial photography. If your using 800mm blades for 3D, the motor, battery, main gear, and pinion will need to accomodate for your flying style.

I am running a 1700 headspeed which allows minimum vibration to the camera gimbal. It was a science to build, and an art to fly.

Here is a T-Rex 800 flying 800mm blades 3D.

Watch at YouTube

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02-02-2012 05:34 PM  6 years agoPost 14
Stephen Born

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USA

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Just received the Maxi Joker 800mm main blades.

Here are the old Curtis Youngblood 710mm blades I used before. They weighed 235 grams each and 28.5 inches long.

Here is the new Maxi Joker 800mm blades. They weigh 240 grams each and a little over 32 inches long.

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02-02-2012 08:28 PM  6 years agoPost 15
Richardmid1

rrProfessor

Leeds, England

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The Old Guy,

If I were to do it I would use a 10T pinion with the 510kv motor and govern to 1700rpm, this would probably give the same flight time as the setup I have now which is 11T pinion governing to 1950-2000.

60% of the time, it works every time!

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02-04-2012 04:09 AM  6 years agoPost 16
spiderco

rrVeteran

Henderson, Nevada

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What kind of flight times are you getting Richardmid1?

fly til its dry

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02-04-2012 05:05 AM  6 years agoPost 17
Band1086

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Kennewick, Wa. USA

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I have a TR800 and now a TR 750. On the 800 the disc puts such a high load on the gear train you may very well strip the main gear with a 10T pinion. I stripped a KDE main gear with an 11T pinion. Yes, I have a pretty strong motor, but if you're going to push it very hard you need a lower KV motor and bigger pinion. The 3D vid shows very good quality flying, but somewhat lumbering. If a person uses a good FBL unit, those big blades can become very fast on the cyclic. Mine is very fast, but I'm getting a very high torque 400KV motor for it, so I can fly it hard and fast with a 14T pinion. I tried 813mm mains and 115mm tails on it, but they hit when I flew it hard. You have to use 115's on the tail, esp. if you want to fly fast backwards. Flying hard, the 800's still may hit because it seems like they touched farther in on the mains than 13mm. Even though the 800's make the heli VERY light, I think the 753's are a better fit. My 750 flies freakin' awesome, and I don't have to worry about the mains and tails hitting and it still flies very light and VERY fast on the cyclics.
BTW 1900 HS is screamin' on the 800's and almost too fast on the 750's. I'm flying 1800 now, but am thinking about trying 1750 next...

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