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Real Raptors . Mikado Modellhubschrauber . GrandRC

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Crashed? Discussion and Photos > Binned it real good...
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Had my second crash of the week today with the R50 V2...

After a failed attempt at flying some circuits earlier in the week, I tried again to day buddied up with a decent flier...

Started to get the hang of my right hand turns but the left hand of the 8 went a bit pear shaped.... had already recovered a few similar ones so my buddy gave me a bit of rope and unfortunately I chose to dumb thumb and left him far to much work to do....

Result he managed to get it level and hit full power/pitch but it was coming down too fast.... tail hit first.... BOOM STRIKE....

Head block broke clean off (mercy killing) as it was under full power and as a result very little damage....

Photos coming later....



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03-30-2003 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus





I have now discovered that the main shaft is perfectly straight... (not that the photo shows that?????) the feathering spindle is slightly bent... tail shaft straight... I think its good that the jesus bolt stayed put and the head block broke...

Shows how tough the new V2 jesus bolt is



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03-30-2003 Over year old.
 
 
maddog7
Senior Heliman
Location: Monkseaton, Newcastle, UK

Shame to see that, looked like a really nice bird before the plant.

I nearly smashed mine up yesterday doing inverted hovering, first time (ever) no probs at all, managed about 30 seconds, then pulled out woo hoo ! second time brain overspill, went to bail it and ended up doing a bottom half of a loop, actually flew through the long grass it was that close!

Cheers
David

BTW it looks like quite alot of force went throught that, I'd be tempted to strip the whole thing and check for cracks in the frames etc
03-30-2003 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Hi Maddog

Thanks for the advice, have done so and all is well...

Just as well as the frames were new 4 days ago

Along with the blades feathering spindle etc etc...

The quick UK undercarriage is awesome tho.... didnt half bounce back up, no damage to skids...

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03-30-2003 Over year old.
 
 
maddog7
Senior Heliman
Location: Monkseaton, Newcastle, UK

Hope all is well soon, That UC looks well nice, how much was that? and is it supposed to be 'indestructable'?
David
03-30-2003 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Cant remember but it wasnt much more than a TT set and is far sturdier... (£20????)

They are very much like the Min Air Tuff struts but higher with more ground clearance...



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03-31-2003 Over year old.
 
 
FinnDave
Elite Veteran
Location: Kouvola, Finland

Galifrey, if, as you claim, you are struggling to fly circuits, why are using carbon cut-out fins? I would have thought that the original fins would help with directional stability as well as with visual orientation for your circuit practise.

David S., Kouvola, Finland
03-31-2003 Over year old.
HOMEPAGE  
 
 
SAL
Veteran
Location: Oakville, Ontario, Canada

Sorry to hear about the crash.............

Quote:Head block broke clean off (mercy killing) as it was under full power and as a result very little damage....

Eh? under full power, and little damage. Not two words that really go together, and normally it leads to the funky chicken. Most crashes where the power is off, usually leads to the best chance of minimal damage. It's like the old saying, of when you commit to a auto, and at the last second it goes wrong, your better off just trying to land it, as the blades will be travelling slowly at max pitch. Sometimes even with a horrible landing your heli will be ok, you'll be surprised how much abuse these things can take!!!

One last thing Gailfrey, you said the main shaft, and tail rotor shaft are straight..... don't let me spoil the party, but given your head broke clean off, and the tail blades are damaged, chances are they are bent, and i would replace them.
Roll them on a glass table, as it is difficult to eyeball if a shaft is straight or not.

SAL

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[color=red]SAL[/color]
03-31-2003 Over year old.
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Finndave, the carbon cutout fins are NHP extended ones to give more tail blade clearance...

Sal... The main shaft and tail shaft have both been checked and are straight as can be...

Basically what happened was heli coming towards me in shallow dive should have done up elevator/back cyclic and did forward (duh!!!)

This gave a very fast dive and my buddy then took over pulled back cyclic and full pitch (another 2-3 feet and it would have been safe height is your friend) but the tail touched, boom strike, head snapped clean off (only one damaged blade)....

Heli then bounced on undercarriage and landed few feet further on...

Basically from the back of the frames forward and from the swash plate downwards everything was untouched....

Feathering spindle has the tiniest bend in it, should be an easy straighten with a dial gauge, hoops gone, main swash to mixer links gone 1 short link broken, new head block, new blades, tail boom, tailbox, tail blades (1 broken) boom stays, new rear servo mount (NHP this time) and new tail drive belt.... (3 pieces ) and washout hub...

All back together and flown successfully today.... as smooth as it ever was..



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03-31-2003 Over year old.
 
 
FinnDave
Elite Veteran
Location: Kouvola, Finland

Quote 
the carbon cutout fins are NHP extended ones to give more tail blade clearance...


Clearance from what? Surely they reduce straight line stability, hardly desirable for someone learning circuits.

David S., Kouvola, Finland
03-31-2003 Over year old.
HOMEPAGE  
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Yeah probably makes sense, but directional stability has not been an issue...

Putting in wrong commands has been....



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03-31-2003 Over year old.
 
 
johnboy
Veteran
Location: South Lincolnshire nr Peterborough UK

Quote 
? I would have thought that the original fins would help with directional stability as well as with visual orientation for your circuit practise.


errr..god this things got bright neo pink skids on..pink / white
canopy , white disc and black tail..and on a blue sky .pi55 easy to see,

As for tail clearance , rappy 50s are to close to the ground with the standard vertical fins...erkkk..carbons fix that fine and are strong too.

and i cant tell the difference with and without the horizontal plane.only by it's looks

and what aspiring 3D'er flies nornal mode...none

now would a heading hold gyro benifit from from induced directional stability of a vertical fin...errr ...no

augh........some people

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03-31-2003 Over year old.
HOMEPAGE  
 
 
TOSH
Elite Veteran
Location: In Rehab Sunday to Thursday.

sal14m

hi sal.
l saw the crash and beleive me it went in hard on full power.The head compleat with blades left the heli on impact,so no funky chicken.Agree the throttle hold is your best friend but not from about 40 mph,about 15ft high and knifedge.Buddy left it too late,we all get it wrong some times.He had made 2 very good saves earlier on lead with others.One inverted flame out.Galifrey was just unlucky l guess.
03-31-2003 Over year old.
 
 
maddog7
Senior Heliman
Location: Monkseaton, Newcastle, UK

Johnboy just had a peek at your nice red metal head (err..) and what did I see lurking there! STD placcy pitch hoops GERREMOFF!! get some alu ones on.

And also can you give me some details of how you did your uniflow plumbing pleeze?

Cheers
David
03-31-2003 Over year old.
 
 
TOSH
Elite Veteran
Location: In Rehab Sunday to Thursday.

maddog7
Metal to metal? sorry mate but bad idea.Would look good though
03-31-2003 Over year old.
 
 
maddog7
Senior Heliman
Location: Monkseaton, Newcastle, UK

Tosh,
Doh, of course silly me. I wonder if anyone does anything similar in carbon or paxolin?

Just seems such a shame to have the failure prone placcy things on a work of art head!
04-01-2003 Over year old.
 
 
johnboy
Veteran
Location: South Lincolnshire nr Peterborough UK

GERREMOFF!!

hehe

no way hosay.....pence to buy and sacrifical in a crash....and i do crash.......

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04-01-2003 Over year old.
HOMEPAGE  
 
 
FinnDave
Elite Veteran
Location: Kouvola, Finland

Quote 
As for tail clearance , rappy 50s are to close to the ground with the standard vertical fins...erkkk..carbons fix that fine and are strong too.


Turn the undercarriage supports round. Simple and free. The carbon tail and other flash bits sound like a pose for someone who can't yet manage a circuit.

David S., Kouvola, Finland
04-01-2003 Over year old.
HOMEPAGE  
 
 
G.Man
rrProfessor
Location: Northants, but soon to be Nicosia, Cyprus

Thanks for your opinion on the posing Dave...

What relevance it has I have no idea but I guess you are entitled to give it...

The carbon fins were recommended to me by Russ Deakin as they allow use of longer tail blades giving a more powerful tail and allow the odd tip back on landing without wiping out the tails...

I had the undercarriage turned round but as raptor undercarriage as very brittle it has now been changed for something more substantial...

As I value Russ's opinion far more than anyone on this site I will stick with the carbon fins thank you....

They had no influence on the crash, and if I choose to fit expensive carbon bits to my heli then that is my choice...

I dont fly normal mode as flying HH allows me to learn to steer the tail properly in a turn... this will serve me better when I do eventually learn my circuits and want to progress to more difficult things...

On the other plus side, they do look real posey and I like posey bits

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04-01-2003 Over year old.
 
 
SAL
Veteran
Location: Oakville, Ontario, Canada

Not to worry Gailfrey, i bet that day you went 10 steps forward, and only 1 step backwards with the crash......

As for the 3D cutout fins, if you have a good HH gyro it won't make a difference, you'll still need to swing the tail around. So i your case 3D fins, or standard solid would not make a difference at all. (Sorry Finndave, gotta disagree with you on that one )

If you were running normal mode, and had standard solid fins, it helps bring the tail around.... in this case Finndave's point is valid

SAL

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[color=red]SAL[/color]
04-01-2003 Over year old.
 
 
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Crashed? Discussion and Photos > Binned it real good...
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