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HelicopterAerobatic FAI F3C F3N Contest › Hirobo eagle 3 CG
01-24-2007 09:40 PM  10 years agoPost 21
bald eagle

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detroit michigan

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the head will not make any differance on cg .
but check the level with a full tank and a empty tank there is a differance for fai what level is the happy spot for the best results
maybe 3/4 of tank and balance it from there who knows

jeff

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01-25-2007 07:04 PM  10 years agoPost 22
synodontis

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United Kingdom

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jeff,

I was actually asking about the difference in feel between the SSR-VII modified to underslung and SSZ-III. But if there is a weight difference between them you are almost certain to get a CG change (maybe a very miniscule change but there will be a change), and I am almost certain that there is small change in CG in switching heads because of their design which effect the distribution of the weight.

I suppose we aren't like Curtis who has always flown with a front mounted fuel tank, one of the few reasons why I don't like fly a Vibe.

I was thinking, since people are putting weight right out there on the nose, and when the fuel level changes the CG change is noticable, you might want to put more weight closer in, this should lesser the effect of the fuel tank level change. For example if you put 20 grams at distance of 30 cm from CG line, you might as well put 40 grams at 15 from CG line (same effect) only disadvantage is that you've put on more weight . . .

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01-25-2007 11:08 PM  10 years agoPost 23
iyoy

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Bacolod City, Philippines

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I was thinking, since people are putting weight right out there on the nose, and when the fuel level changes the CG change is noticable, you might want to put more weight closer in, this should lesser the effect of the fuel tank level change. For example if you put 20 grams at distance of 30 cm from CG line, you might as well put 40 grams at 15 from CG line (same effect) only disadvantage is that you've put on more weight . . .
Huh? Is this a new law of physics?

iyoy

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01-26-2007 12:21 AM  10 years agoPost 24
synodontis

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United Kingdom

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no iyoy, think about it, I was doing the calculation in my head, don't have time for a diagram.

If you know how CG is calculated what I say makes perfect sense

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01-27-2007 02:58 AM  10 years agoPost 25
iyoy

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Bacolod City, Philippines

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Yes, the effect on the CG and the moment would be the same but there won't be any difference with regard to the change in CG as the fuel is emptied from the other side. The effect would be the same between the lighter weight/ longer moment arm compared to the heavier weight/ shorter moment arm. So what's the point in having a heavier weight if you can achieve the same effect with the lighter weight and longer moment arm?

Remember, when you compute for CG, you are calculating TOTAL MOMENT.

iyoy

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01-27-2007 07:54 AM  10 years agoPost 26
Eagle

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Australia

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My Eagle 3 balances nose heavy with a 4.8v 1950 mah NiMH and 50g of weight on the front of the tray and the tank filled to the first ridge on the tank (around 3/4?) When the tank is empty and you pick it up by the flybar, the back skid is 22mm off the table before the front skid lifts off.

At this point I have found that it sits better when hovering in heavy wind. Aeros seem fine.

I use a carbon boom and belt drive also.

Cheers
Brendan

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02-05-2007 02:22 AM  10 years agoPost 27
toti_ducati

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manila

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syndontis-i had my original SSR 7 head converted to underslung flybar, using EVO parts
last sunday I tried the new pearl white /black hirobo blades which is 200 grams
heavier than the original black/white blades FFF flight is more stable and autos are way easier!
can anyone tell us the Diff between the SSZ3/RF head and the ssr7 converted to underslung, which is better?

eagle 2 EX WC eagle 3 WC / Fury Extreme

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02-05-2007 01:33 PM  10 years agoPost 28
Lewd Skywalker

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Manila, Philippines

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SDX FBL | Eagle3 SWM | Trex 600EFL Pro

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02-11-2007 02:16 PM  10 years agoPost 29
iyoy

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Bacolod City, Philippines

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Toti,
The SSZ-III head is not the same as the 'R/F' conversion with the 'underslung' flybar. 'R/F' stands for Rudiger Feil, the designer of the conversion using the yoke and grips of the SSR-VII and other components from an FFZ-III. The FFZ-III is the plastic head on a standard Freya Evolution 90.

The SSZ-III head is the head that comes standard on the Freya Evolution 90 O/P and can be purchased separately as a complete set that can simply be bolted on your heli.

This has already been explained to you many times before by several people, myself included.

The Hirobo 'pearl white' blades p/n: 0414/416 weigh 220 grams.

iyoy

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02-12-2007 01:31 AM  10 years agoPost 30
rgl726

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cebu city, philippines

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Iyoy,

The SSR7 head have individual spindles, and the FFZ3 has one spindle to hold both blade grips, what about he SSZ3, does it have individual spindles, or is it exactly the same as the FFZ3 but it metal version?

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02-12-2007 03:34 AM  10 years agoPost 31
Lewd Skywalker

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Manila, Philippines

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rgl726: musta bro? Yup the SSR7 and the R/F conversion (and other SSR version) heads have separate spindles as they use the same yoke. The FFZ3 and the SSZ3 both uses one spindle (straight through the yoke)

SDX FBL | Eagle3 SWM | Trex 600EFL Pro

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02-13-2007 08:43 AM  10 years agoPost 32
iyoy

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Bacolod City, Philippines

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Shaolin,
Yes, FFZ-III and SSZ-III are identical except the latter is the all metal version.

iyoy

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02-13-2007 09:02 AM  10 years agoPost 33
Lewd Skywalker

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Manila, Philippines

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Hi Iyoy

Time to fly the other wind. Grabe palpak almost crashed flying left-to-right and front-to-back wind.

SDX FBL | Eagle3 SWM | Trex 600EFL Pro

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02-17-2007 06:05 AM  10 years agoPost 34
toti_ducati

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manila

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iyoy- compared to the underslung flybar heads like the ssz3 and RF. where does the ssr-7 converted using evo op parts stand?

eagle 2 EX WC eagle 3 WC / Fury Extreme

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02-18-2007 12:37 PM  10 years agoPost 35
iyoy

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Bacolod City, Philippines

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toti,
Please read my previous post and try to 'unconfuse' yourself.

The 'RF' is the SSR-VII converted to underslung flybar. The SSZ-III is a different head altogether but shares the same components as the RF SSR-VII conversion such as the blade grips, stabilizer bar holders and connectors, seesaw, center hub.

As far as flight characteristics are concerned, they are practically the same, the SSZ-III being marginally better than the RF SSR-VII conversion.

iyoy

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02-18-2007 05:39 PM  10 years agoPost 36
synodontis

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United Kingdom

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I'd also like to clear a few things up.

I personally thought that the SSR-VII was partial flapping. It is NOT. I opened my head up to see for myself. It uses these large cicular hinge washers on either side to prevent the needle pin from moving (there's a grub screw too at the bottom end for good measure). The old SSR-VI head only used a screw either side to prevent the needle pin from moving. It is the needle ping that holds the spindle. Since it is a tight fit through the yoke there appears to be no flapping at all. The O-ring is used because the blade grips on the SSR-VII is the same as the SSZ-II and is there to fill the space.

Hence we can deduce from this that owners of the old SSR-VI head can also convert to underslung like SSZ-III since both the SSR-VII and SSR-VI use the same centre hub, although this head would not be like the RF SSR-VII conversion since the geometry is different.

I still think that the SSZ-III head is way overpriced for what it is.

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02-20-2007 10:01 AM  10 years agoPost 37
Lewd Skywalker

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Manila, Philippines

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toti,
Please read my previous post and try to 'unconfuse' yourself.
Hence we can deduce from this that owners of the old SSR-VI head can also convert to underslung like SSZ-III since both the SSR-VII and SSR-VI use the same centre hub, although this head would not be like the RF SSR-VII conversion since the geometry is different.

I still think that the SSZ-III head is way overpriced for what it is.
Yup, some had converted their SSR-VI to underslung flybar also however the total disc diameter will be bigger since the SSR-VI has longer blade grips than the SSR-VII.

Got my SSZ3 head for about $300

SDX FBL | Eagle3 SWM | Trex 600EFL Pro

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04-28-2007 01:52 PM  10 years agoPost 38
Quickster

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Victoria, Australia

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Getting back to CG, my Eagle 3 which was the original shaft drive with carbon boom variant and I was using a 4.8v 1700mah pack and it balanced perfectly with half tank of fuel and NO lead weight!

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HelicopterAerobatic FAI F3C F3N Contest › Hirobo eagle 3 CG
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