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HomeScaleAircraftHelicopterScale Model RC Helicopters › t-rex 450 scale head
03-03-2008 10:13 PM  10 years agoPost 61
doorman

rrProfessor

Sherwood, Arkansas

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Total Pitch
I used the stock follower and the stock linkage that were on my rex already.
I moved the low point of my pitch curve until I had 0 degrees pitch at low stick (I am at 50% for my low setting) This was also to insure that he "knuckle" on the follower could not get below center (so you need to do this on all modes) I then set my pitch curve from there.... but in my swash mix settings I am running 60 on Ail and Elev and 100% on pitch..... sounds unorthodox but works just fine.... then fine tune it with the final setting of your pitch curve....you should be hovering very close to half stick....
Good Luck and let us know how you do with it.... And don't forget the nose weight... the front of my skids stay on the table until the rear of the skids are up about 1"..... flies awesome!!!!!!!

Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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03-03-2008 10:46 PM  10 years agoPost 62
coptercptn

rrElite Veteran

Mesa AZ. USA

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therein lies my dilema...with the servos all the way up..I have minimal lift. and even at parallel arm setting I am showing negative lift. This tells me that the links are too short..?
Now, if I move the ball links out on the servo arms I will get more throw but I end up with an angle to the swash I am not happy with...Trying to keep this as straight as possible...
I guess I am going to have to manufacture something...But I just can't see why my 450 would be any different from yours? (Stock SE)
And yes I was very carefull to assure the follower did not bind or go over center on me..
I did spool it up and the phazing didn't feel that bad..(It went where I directed it to go) but with the lack of pitch my head speed was off the chart and no lift..so I stopped.
Any Ideas?

Home of the "Sea Cobra".....

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03-04-2008 12:02 AM  10 years agoPost 63
doorman

rrProfessor

Sherwood, Arkansas

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Follower Location
Do you have the follower all the way up against the bottom of center hub?? If not it will restict your travel and give you no pitch...
Ask me how I know that

Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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03-04-2008 02:43 AM  10 years agoPost 64
coptercptn

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Mesa AZ. USA

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yes..that isn't my problem...the follower is all the way up..the problem, as I've said before, seems to be linkage rods being to short to allow enough movement from the servos. I guess I'm going to build a couple or 3 longer ones.

Home of the "Sea Cobra".....

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03-04-2008 12:58 PM  10 years agoPost 65
MichaelC

rrApprentice

Vermont

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Interesting problem.... I test flew my 4-blader this weekend and like Stan I used the stock linkages on my rex. BUT... unlike Stan I moved the arms on the servos so that my max negative is -1 and then adjust the swash gain in the radio so that my total pitch range is -1 to +10. This way i can use the entire range in my pitch curve. My swash mix is elev and aile +60 and pit +40. I'm still dialing it in so I can get the headspeed where I want it but I'm extremely happy with how it flies.
Mike

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03-04-2008 02:47 PM  10 years agoPost 66
coptercptn

rrElite Veteran

Mesa AZ. USA

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how many of you are using a DX7? I still have my swash mixes @ +60 across the board.

Home of the "Sea Cobra".....

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03-04-2008 04:04 PM  10 years agoPost 67
doorman

rrProfessor

Sherwood, Arkansas

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DX 7 and Settings
I shot some pic's of my setup.... a lot of times one picture is worth a LOT more then that 1000 words!!!!!!
Maybe they will help out...
This is using the stock linkage from the servo to the swash.
All shots of the servo's were with the throttle set at 1/2 and the last shot where the arms look to be almost straight is my low point. This set up hovers a 1/2 stick..... good luck Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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03-07-2008 04:03 AM  10 years agoPost 68
coptercptn

rrElite Veteran

Mesa AZ. USA

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ok I got it all together...blades tracked linkages where they should be (I think)..went to spool it up...everything smooth..
Then the tail rotor STOPPED!!

I managed to melt the plastic gear from the belt drive on the chassis end...I wasn't even aware this 450 had a plastic gear..but it WILL get a metal one ASAP..

The good news is I wasn't in the air with it when it went south on me...so no damage..

Home of the "Sea Cobra".....

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03-07-2008 04:37 AM  10 years agoPost 69
seattle_helo

rrKey Veteran

Seattle, WA USA

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Align is suppose to coming out a special blades for multibladed but so far no news yet. If they do come out, I believe we can buy 5 blades in a pack instead of buying pair by pair.
I spoke with a USA Align rep very recently and he told me that Align has put their scale heads on hold as they focus on the 500 series and upcoming 700 series. So, unfortunately, it seems like we'll be buying blades as pairs for a while still.

Stan, I have done some tests and the fake "carbon" blades are much heavier and much better than the woodies. By far! I will have to do a lot more to get it dialed in, but they are a big help. Thanks for that info!

nick

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03-07-2008 05:41 AM  10 years agoPost 70
Super-Hornet

rrVeteran

Singapore

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I spoke with a USA Align rep very recently and he told me that Align has put their scale heads on hold as they focus on the 500 series and upcoming 700 series. So, unfortunately, it seems like we'll be buying blades as pairs for a while still.
Oh Damn!! Oh well, long waiting again.

Recently I was testing Align Pro 335mm blades with 5grams weight embedded inside near the tip (DIY)

SH

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03-07-2008 05:59 AM  10 years agoPost 71
seattle_helo

rrKey Veteran

Seattle, WA USA

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And how has that been, SH?

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03-07-2008 12:25 PM  10 years agoPost 72
Super-Hornet

rrVeteran

Singapore

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Still testing. Will let u know after a few flights.

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03-07-2008 01:19 PM  10 years agoPost 73
slider46

rrProfessor

Ocala Florida

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Good idea Super Hornet, Some of you may remember, back in the begining, adding weight to the blades was the way the blades came to balance them. We had wood blades and added a piece of lead solder in epoxy to get the tip weight and balance for the blades then cover them with shrink tubing and ca the tips... Nothing came pre-made back then...

Tom..... No "D" flying....

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03-07-2008 02:49 PM  10 years agoPost 74
coptercptn

rrElite Veteran

Mesa AZ. USA

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Other than being a bit Longer..(325 vs 315) I might try these...I have some on my Huey and they fly pretty good...+ at $25 a pair not real expensive...(Of course right now they show out of stock..I must have bought too many )
http://www.xheli.com/325caroblufo.html

Home of the "Sea Cobra".....

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03-08-2008 10:54 PM  10 years agoPost 75
jmb2232

rrApprentice

League City, TX

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Well guys, here's mine. This is the photo shoot before the test hover with fuselage installed. Thanks to all of you for sharing your experiences, ideas, and advice. We'll see how it goes. Keep your fingers crossed!!

Mike B.

Watch this!!! THWACK!!! Honey, where's the checkbook?

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03-09-2008 01:44 PM  10 years agoPost 76
doorman

rrProfessor

Sherwood, Arkansas

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Looking Good!!!!!!!!!
jmb2232 looks real nice.... let us know how the testing goes....
From the pic's it looks as if you are in the "park" with the follower, and just be sure that you have plenty of nose weight in it...good luck and waiting to hear how you progress....
This has been a fun project to build and follow..
Stan

AMA 2918-Team Spin Blades,,Castle Creations, Unique Aircraft

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03-09-2008 01:56 PM  10 years agoPost 77
jmb2232

rrApprentice

League City, TX

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I've got two ounces of sticky back lead wheel weights in the canopy in the extreme front. When I pick up the heli by the head button, the back of the skids come up about 3/8 of an inch before the front. When I test flew in pod & boom I had nose weight in the 450 canopy also. I'm using a Jazz ESC with a Medusa 28-32-3400 11T pinion. I've got it set so I'm running a head speed of about 2100rpm at zero pitch. My blade pitch runs about -1(at low stick) to +9. Thanks for the reminder on the nose weight! Gonna try and beat the wind before it comes up.
Mike B.

Watch this!!! THWACK!!! Honey, where's the checkbook?

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03-10-2008 03:59 AM  10 years agoPost 78
eaglespirit

rrNovice

Fayetteville NC

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5 Penta Bladed head...
...um...exactly what are 'Penta' blades? Inquiring minds wanna know!

helicopters, like bumble bees cannot inherently fly..according to Newtons law of physics

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03-10-2008 04:08 AM  10 years agoPost 79
seattle_helo

rrKey Veteran

Seattle, WA USA

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Penta = five.

Just as:

Quad = four.

Tri = three.

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03-10-2008 04:29 AM  10 years agoPost 80
eaglespirit

rrNovice

Fayetteville NC

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penta Blades
Graci'

helicopters, like bumble bees cannot inherently fly..according to Newtons law of physics

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HomeScaleAircraftHelicopterScale Model RC Helicopters › t-rex 450 scale head
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