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HomeScaleAircraftHelicopterScale Model RC Helicopters › hirobo 3 bladed head
11-02-2004 05:14 AM  13 years agoPost 1
imback

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las vegas, nevada

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i am in the process of assembling my three bladed head to put on my lama:

the blades are not very wide and do not appear to be very heavy. does anyone have experience flying these blades? do they fly well?

i am thinking about putting some weight into the leading edge. is this a good or bad idea?

any other thoughts?

nels

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11-02-2004 10:58 AM  13 years agoPost 2
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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those blades fly very well. install all the weights as per instructions(the new sets i believe come pre built) and you will have no worries.

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11-03-2004 06:41 AM  13 years agoPost 3
imback

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las vegas, nevada

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copter doctor
the blades have the roots installed and possibly weights. the covering has to be installed.

the blades felt like like they were weighted in the leading edge, so i simply covered them. now i have to install the new main shaft and set up the head.

any tricks or advice?

nels

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11-03-2004 11:06 AM  13 years agoPost 4
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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its pretty straight forward from what i remember. use locktite(not too much) on that screw that goes in from the top of the mast. the swashplate timing/phasing on a 3 bladed head is the simplest to do, just follow the instructions and be sure to use different color tape on the tip of each blade for tracking. also be sure each blade is balanced. find the heaviest blade, then match the other two to it. have fun!!

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11-03-2004 01:25 PM  13 years agoPost 5
dariof

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Henderson, NV / Laguna Niguel, CA

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IMBACK

As promised, I would save my 500th post for you.

I have absolutely nothing to say about this topic, except I am looking forward to seeing whatever you are now putting together fly at the field.

Best Regards, Dario

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11-03-2004 02:31 PM  13 years agoPost 6
55crownvic

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Colorado Springs

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Hey Nels, tell me how it goes, I might want to do the same with my Lama. I know it will want to balloon on you and the cyclic will be slower(i think). Am getting the 3 bladed tail from eric_b here, so will have to get the 3bladed head as well

Dave

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11-04-2004 05:10 AM  13 years agoPost 7
imback

rrApprentice

las vegas, nevada

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blade balance
copter doctor:

my first set of blades were an issue. two were within .1 gram. the third was 10.2 grams heavier!

i received a new set of blades and they are much better. two are identical and the third is .2 grams off. i will use a little more blade tape on this one, but not much.

the span wise cg appears to be right on. i did not check the chord.

i am debating whether to fly the three bladed head with my 401 that is acting up, or put the new gyro in the bird and see if that helps before flying the three bladed head.

in heading hold mode the bird flies fine. however, in "normal" mode, it acts like there is no gyro! it is been a lot of years since i flew without a gyro!

thanks for the help. i will let you know now it goes. probably won't have time to put the new head on until next week. spending too much time trying to make the tt defender look real!

nels

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11-04-2004 11:05 AM  13 years agoPost 8
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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good deal Nels. i'd make sure there are no issues at all with the machine b4 putting the 3 bladed head on. it will be different enough flying and getting used to it so you dont want a gyro with issues hampering any of that. have fun

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11-07-2004 04:16 PM  13 years agoPost 9
imback

rrApprentice

las vegas, nevada

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new issues
i have set up the tail. prior posts for the 401 and 8103 suggest that you use aux 2 for the gain and change sensitity in travel adjust. i use the gear chanel. moving the gain down to 20%, as suggested, results in no gain! i moved the gain up to 80%, and the gyro works well.

that latest issue is the length of the rods for the head. they are so long that i had to move the collective arm down. now i have about 10 on the bottom and 15 on the top! obviously, i need to dial most of this out.

anyone have any ideas on why there is so much throw? did anyone who built this head have similiar issues?

thanks for the input.

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11-08-2004 12:13 PM  13 years agoPost 10
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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the multibladed heads usually do not require as much travel and keep in mind that since the rods go directly to the pitch arms with no mixing unit to take all that movement out, the pitch range will be greater with the swash movement you were used to. now, this is what you do. use the collective atv or end point adj or travel adjust (all the same just depends on your brand radio) to limit the up and down movement of the swashplate. i typically use about -3, +3or 4. and +5or 6 on top. it will all depend on blade, head speed and what makes you comfortable. this is why i dont usually use pitch guages, i setup by sight, sound and feel. be sure you set things mechanically first, then use the radio to find tune it all. good luck

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11-09-2004 02:05 AM  13 years agoPost 11
imback

rrApprentice

las vegas, nevada

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copter doctor
thanks for the insight. i set it up with 5 on the bottom and 8 on the top for hovering and forward flight. i left about 10 on each side for idle up two and autos.

i only have about 65 and 80 on the travel. i hate taking that much out of the throw. shorter rods would allow the full travel and i could tone it down.

if it does not rain on thursday, out to the field for a flight.

btw, does it matter where the follow is placed. obviously, there is only one position as it attaches to the swashplate. but i did not think about the position in relation to the head! am i doomed?

nels

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11-09-2004 11:11 AM  13 years agoPost 12
Copter Doctor

rrProfessor

Enterprise/ft.rucker ,al- home of army aviation

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YES!!!! it is VERY important!!!! that is what sets yur timing or "phasing" this is what you do; as you know the head spins clockwise looking down from the top. take a blade and position it perpendicular to the tailboom, this blade must be on the heli's left. now,loosen the swash driver and be sure that the pitch rod for that blade, is positioned at the very front of the heli so that it lines up with that for/aft link that moves the swashplate for forward and backwards. now tighten the driver and your phasing is set. this is how it was set on my hirobo schweitzer 300 and it works great

good luck

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11-10-2004 06:20 AM  13 years agoPost 13
imback

rrApprentice

las vegas, nevada

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copter doctor
thanks for the info. i knew this was an issue, but could not find anything in the "instructions" that said how to set it up. i will use your instructions and should have a great thursday, if it does not rain!

nels

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