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Old Nov 26, 2014, 03:23 PM
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Quote:
Originally Posted by Rajah235 View Post
Hey Steve,
It almost looks fast enough to try a loop or 2.


Nice & stable too.

You said that the main shaft was bent?

I wouldn't touch it as it performs very well.
It flew better before I tried to fly in 11F weather and lost my gyro.

She came down hard but the skids took most of it.

Still, something is out of whack, as you can see it wobble during spool up / down
and it never used to do that.

Like you said, it's flying great and it has inspired me to go all the way and build
another Blade 450FP, only this time with performance oriented gear.

The blades on the HK450 work, but were trimmed a little too much and I can
get much better performance with a little more chord and taper.

If you add the proper blades to a full carbon & alloy 450 FP with high quality
servos and electronics, it should really be a sight to behold.

This is what I had in mind for a donor airframe.
http://www.hobbyking.com/hobbyking/s...x_Compat_.html

I can use the extra-long blade grip ball ends to build custom mixing arms, and the
factory designed swash locker assembly is already in place.

The plastic rotor head will be swapped out for the Heli-Factor aluminum rotor.
http://www.heli-factor.com/shop/inde...&products_id=6

I might not be able to use the Heli-Factor grips due to my custom mixing arms, and the
stock V913 grips are plenty stiff if you get longer aftermarket nuts & bolts and then
sandwich the aluminum plates together.

Add a CF boom and tail blades along with some strong digital servos, and we have the idiot-proof heli-jet.

The end product should be 100 grams lighter than our current 450FP, should have
faster responding "collective" (lift) and better sounding blades, and the cyclic response
should increase quite a bit due to lower weight & reduced flexing in the head and frame.

___________________________________

Oh, and Pa the 8008 blades on the HK450FP are painted with two coats of spray-can gloss white.
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Last edited by Steve_; Nov 26, 2014 at 04:37 PM.
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Old Dec 04, 2014, 05:42 PM
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I finished my 450 fp conversion and maidened it today. With the epa's at 100%, the dual rates at 50% and trimmed V913 blades it wasn't much better than a co-axial. For a second I thought that I was going to lose it in the wind.

I turned the dual rates up to 80% and it was much, much better, but it has excessive air frame rock.

The heli weighs in at 849 gms. with battery and canopy. Some of that weight is down low with the fpv camera mounted down low between the skids on an aluminum plate.

The weight down low probably contributes to the rock, but the blades are also too flexible as Steve has pointed out.

My 8008 blades and 68 mm tail blades also came in the mail today. I spent several hours trimming the 8008's down. I'm starting with them at 12 1/4" long, 33mm wide at the root and 18mm wide at the tip. They're 32 gms each.

If the weather is OK tomorrow I'll give them a try. More than likely they'll have to be trimmed more. The V913 blades would hover at 50% throttle, a little less than I like.


Update: I tried the new blades and they work great: no more air frame rock. They definitely need further trimming though as it will hover at approx. 35 to 40 percent throttle. Even at that low a head speed though, the 68 mm tail blades have no trouble holding the tail.
My cheapo 401B gyro didn't like the cold, but worked well enough.
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Old Dec 05, 2014, 01:03 AM
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United States, WI, Beloit
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The 8008's should help with the rocking.

I trashed a set or two by trimming them too much.

Definitely requires some trial and error.

I agree that without full rates they have almost no cyclic at all.

This is why the Blade 450 conversion was built as light as possible (800 grams).

The less the 450 weighs, generally the better the cyclic works.

Have you tried an F-45 head on a 450? I have only tried the V913 head, but I do have an F-45
that I could cannibalize.

Anyhow, I want to switch to FBL. FP's (like the 200 SRX) only bigger.
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Old Dec 05, 2014, 08:35 AM
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[QUOTE
Have you tried an F-45 head on a 450? I have only tried the V913 head, but I do have an F-45
that I could cannibalize.

Anyhow, I want to switch to FBL. FP's (like the 200 SRX) only bigger. [/QUOTE]


This is my first foray into 450 fp so have only used the V913 head.

I have a possible project in mind though. What if I was to take a rectangular piece of aluminum and machine it so that I could bolt regular 450 cp blade grips on it and have it fit the V913 head as the V913 grip normally does.

The angle of the grips could be changed to experiment and get the right amount of lift.

If it worked it would open up a whole new world of blades that could be used.

Would I lose a lot of the self leveling effect though because the stiffer blades available wouldn't cone like the plastic ones?
__________________________________________________ _________________

I checked out the F45 head. It seems almost identical as the V913; just small differences such as the linkage guides. Don't really think that it would be any better or worse.

Also, after my first test flight with the plastic fantastic 8008 blades I'll probably hold off on trying to make the aluminum blade grips. The 8008's worked great.
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Old Dec 08, 2014, 05:17 PM
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The specs on my 8008 blades after the final trimming are: length-12" from the center of the bolt hole to the tip, width at root 26mm, width at tip 16mm and weight 27 grams.

That also is the exact weight of the fiberglass blades that I use on my cp.'s.

With the Turnigy 2218 3550 kV motor and 12t pinion it hovers at 50% throttle. I have 11t pinions coming and think that they should be perfect. (At least I hope that they'll be: I really don't want to have to trim the blades anymore. It's a real pain to keep trimming and balancing before testing.)


The 11 t pinions should also be easier on the esc. It's getting a little too hot for my liking right now.

If the new pinion doesn't allow the esc to run cooler I'll try a lower kV motor.

I also wound 2 gms of solder around each end of the flybar just inboard of the end weights to help it with the heavier blades.
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