[MarkToo]

Listen to the boys. They're right.

1. Many helicopters do not like smooth, hard, slippery surfaces and can resonate like that - or worse.

2. You indicate your blades are pre-balanced? Unless they're Rotortech's or the equivalent quality (not many are), they are not pre-balanced. Balance them.

3. Hover the helicopter. Fly it off the lawn if you're uncomfortable with the spool up shake.

4. You can power it up and down like that 'till you're blue in the face, as many times as you like but, will never figure anything out.

[moo]

Originally Posted by mcx

... the old blades back on it. these are balanced straight from the factory. ...

Does anyone else see the problem with this statement?

Why would you think the blades are balanced from the factory?
Get yourself some tape, razor blades, and a beer or two.
Check the tracking after you have perfect static balance.

well if ya wont believe me then well here is the link to the blades i have on it now. pls enjoy as you read the following statement



http://www.hopuphelihobbies.com/inde...m&itm=HHH-3252

325mm FRP Fiberglass main blade - T-REX450

The precision, quality and performance of a rigid fiberglass blade at an affordable price.

These blades are pre balanced at the factory. Fits 400-450 size Helicopters.

Requires: Main blade shims / spacers for use with the Blade 400 (Item HHH-102)

Specifications:

Length 325mm
Blade thickness: 4mm
Root thickness: 4.5mm
Weight: 47g/pair

[Wayne Reid]

I always check the balance of my blades regardless of the fact they are supposed to be factory balanced. I check the CG and the weight and make sure both blades are the same. I also weigh both paddles as well. I have had blades that were supposed to be factory matched and they were not.
I also use a balancer like the Dubro one to check the rotor head without then with the blades. I will admit though that after making sure both blades match I sometimes fly the heli with the blades and if there are no vibrations I skip using the balancer. But only if everything is running smooth. If there is even the smallest vibration the head goes on the balancer.



Wayne Reid

[OICU812]

Just cause they say they are balanced does not mean they are period. I have bought several high quality brand named blades and found more then a few pairs out of balance that required being weighted, ie: tape etc at the COG point so lets not all believe what they "say" do check, it does not take much effort to ensure this.

[rotormonkey13]

I'll second what the other guys are saying. rotortechs and radix blades claim the balance at the factory, and they match their blades very well.

Align also claims they're balanced along with every other blade manufacturer out there. I've seen the 325 woodies out more than a gram from one blade to the next though. That is a LOT for 325s.

Balance the blades. Especially if they're an off brand. If balancing the blades doesn't do it, then start balancing everything that spins. A fuselage is not a spinning part, and can't cause a vibration, so switching it out won't do you any good.

[moo]

Originally Posted by mcx

These blades are pre balanced at the factory.

Length 325mm
Blade thickness: 4mm
Root thickness: 4.5mm
Weight: 47g/pair

Cool

You I believe, I have difficulty believing the seller.
I would get out the razor knife and test them at least.

[moo]

Originally Posted by mcx

http://www.hopuphelihobbies.com

another online vendor hiding behind a blind registrar, no name, no address, no phone number , no recourse if things go awry sigh

spelling erratic, grammar sporadic (upgraded from poor)

i would guess at Canadian, further inquiries pending

actually moo, he is my forum sponsor. and was my club sponsor untill i closed that down cause of no interest in it around here.

ok guys and gals heres my newest delima. i am over at dougs right now, we tried spooling it up downstairs and to now way can we lift it. now my throttle curve is to low o.o 2 is set at 16.5 3 is35.0 4 is 54.5 and at high is 80.0. running linear pitch curve. now at half throttle she just dont want to get off the ground. move too a few white lines past that and she still dont lift. i used a pitch guage and no go on pitch at all. but yet everything is set at halfthrottle to 90 degree and the arms are all level as well, same with the flybar cage arms and the washout arms..... what is goin on with this? need help before i decide to throw it off the 10th floor.....