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Audacity Models Pantera 50 - Tiger 50 > BBC Kits Are Available
 
 
Billebob
Senior Heliman
Location: Tim-buck-2

Quote 
Just because you bolt a 90 engine in a Pantera does not make it a 90 size machine. You should tell people what you think the limits are on the head in terms of blade weight and headspeed.


Mr. Beech,

Please answer the question, either you know or you don't know the maximum stress level of your 6mm spindled rotor head. Seems a reasonable request to me and one of a wise safety consideration.

BB
06-21-2008 02:38 PM
 
 
MartyH
Key Veteran
Location: Lawrenceburg, Indiana

That doesnt seem to be a fair question. No other manufacturer is going to put a hard number to that answer either. Besides being liable for the answer, there are too many variables involved trying to find that number that it's be a flawed number anyhow.

I do think it reasonable to give us some guidelines regarding recommended blade weight and length as well as max rotor rpm.

Marty,
Raptors,Evos, Panteras and more
06-21-2008 03:59 PM
 
 
Billebob
Senior Heliman
Location: Tim-buck-2

How bout this, will it blow up in your face with 680mm blades at 1900 rpm? Ask any other manufacturer if their 6mm spindled 50 machine will take 90 blades and I think you'll get an answer.... 1 Yes, 2 no it will blow up, or 3 I don't have a clue...you assume all risk.
Most likely answer is 2 IMHO. No hard numbers just smart thinking with 6mm diameter steel and associated hardware.


BB
06-21-2008 04:14 PM
 
 
jbeech
rrAdvertiser
Location: Sanford, FL (Orlando area)

The maximum recommended blade is 620mm.


John Beech - GM (and janitor)
Audacity Models
06-21-2008 05:12 PM
 
 
jbeech
rrAdvertiser
Location: Sanford, FL (Orlando area)

This is a hobby and a country in which folks of all walks of life are free to make their own way. For our product, the maximum recommended blade is 620mm. A 680mm blade won't fit without interference however, folks are free to experiment. Let us know your results.


John Beech - GM (and janitor)
Audacity Models
06-21-2008 05:25 PM
 
 
billm
Key Veteran
Location: Liberty Lake, WA

LOL JB!
I think we are good to go.
We always want +/- .00000000
Thinking we beat this horse to death.
Now lets see how all of you are doing with the new BBC ugrade.
Mine flew awsome today.

My name is Billm. Cough, and I'm a Heli Holic
06-22-2008 12:54 AM
 
 
jbeech
rrAdvertiser
Location: Sanford, FL (Orlando area)

At first I thought you were fooling around but as I think about it I realize you were asking a serious question. It's a fact, however, I really don't think a 680mm blade can be fitted without interference but where there's a will there's a way, and as you know, there's always the will for some.

Consequently, let's examine this further. I.e. can a longer boom/belt be fitted and then a longer set of blades be used? Sure, but I really think this would be an instance where fitting our 50-class head with the much more massive 680mm rotor blade would be a mistake and frankly, I wouldn't recommend it. Instead, this would be the perfect opportunity to adapt an existing 90-class head to the Pantera's 10mm main shaft, which is up to the job. Actually, this would be fairly easy to do.

Hence, it's worth trying if you want to give it a shot, but it would require a judicious and experienced modeler to perform the experiment because there is danger inherent with experimenting. However, using these larger parts, i.e. parts better suited to this class of blade you may end up with something interesting as naturally, once a larger head is fitted to accompany the longer boom/belt I think it's perfectly feasible to believe you would end up with essentially a 90-class heli for not too much money. This is true especially in light of the fact both the bearings and the clutch in the Pantera are seriously overbuilt for a 50-class model and thus, are quite possibly up to the job as well.

Finally, you're not the first fellow to ask me about this, but previously it's been "after" we've found the bottom of a few beer glasses and thus, I've never thought about it seriouly the next morning. However, I have ocassionally mulled this very thought over, i.e. as a way to offer an inexpensive 90-class model to the market. However, I've not moved forward with the idea simply because I haven't thought there would be all that much interest in an inexpensive 90.


John Beech - GM (and janitor)
Audacity Models
06-22-2008 02:10 AM
 
 
Stall_Warning
Senior Heliman
Location: NE, Pa. - USA

How about an inexpensive Gasser?

I'll buy you a glass of beer if you do it!
06-23-2008 02:42 AM
 
 
billm
Key Veteran
Location: Liberty Lake, WA

A gasser would be cool.
Still waiting for the Turbin set up. A bottle of Dom is waiting.
Thats how I roll.

My name is Billm. Cough, and I'm a Heli Holic
06-23-2008 02:46 AM
 
 
MartyH
Key Veteran
Location: Lawrenceburg, Indiana

The gasser would happen for me before a turbine but dont get up and build one on my account. I'm up to my eyeballs in projects as is and its flying season. Between building, flying my own stuff and everyone else that keeps handing me transmitters, I think I'm good for a while!

Marty,
Raptors,Evos, Panteras and more
06-23-2008 06:26 PM
 
 
jbeech
rrAdvertiser
Location: Sanford, FL (Orlando area)

Personally, I'm happy to be selling a few of these BBC kits right now because it's keeping me busy. Frankly, it's nice to have folks calling me for something during hard economic times!

These BBC kits are something, which has taken a lot of time to develop and has been worth it because a lot of folks wanted this, especially because you can pick up used OS61SX or YS61ST2 engine for next to nothing. In fact, I've seen them trade hands complete with muffler for a mere $35-50. I've even heard of folks being given one! Regardless of the source of the engine, the conversion itself is a "smile maker" because a) it's unique, and b) everybody at the field wants to try itout, and c) it's loads of fun! Especailly if you have an OS70SZ or a YS81 laying around because they really make power and their RPM range is compatible to boot.

However, a gasser is a whole other critter vs. fitting an engine, which makes similar-ish power and is of similar-ish size. A gasser is not only a whole lot more mass, but it's a whole lot less power to weight, and thus, if it's of similar size it makes a lot less power (irregardless of what a seller may say). To say nothing of how you'll "destroy" an airframe when you crash because the mass of that engine tears itself loose and breaks "everything" else attached to boot! Don't believe me? Next time you see a gasser pile in, go see how much gets destroyed, it'll make you cry! Add to that there's a reason folks have been converting the Zenoah engine to 91-class airframes despite the engine weighing more than twice what a 91 weighs, i.e it takes that much displacement to geerate the power. In the end, unfortunately, it's a very specialized, i.e. a lot smaller market.


John Beech - GM (and janitor)
Audacity Models
06-23-2008 07:51 PM
 
 
MartyH
Key Veteran
Location: Lawrenceburg, Indiana

Like I said, John, dont go develop one on my account. But, I dont crash routinely so a gasser might stick around for a Summer or two. I used to convert Ryobi and Homelite weed eaters for airplanes just to be different. I even had a Honda powered 31cc powered 1/4 scale cub. It was a 31cc Honda 4-stroke! The engine still weighed 6 pounds converted and was a massive thing but it flew the cub ok and the sound was awesome.

Marty,
Raptors,Evos, Panteras and more
06-23-2008 08:07 PM
 
 
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Audacity Models Pantera 50 - Tiger 50 > BBC Kits Are Available
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