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Graupner MZ-18 9Ch 2.4GHz HoTT


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Burgess
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PostPosted: Wed Jul 08, 2015 9:09 pm
PostPost subject: Graupner MZ-18 9Ch 2.4GHz HoTT
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Anythings has to be better than Spam, spam, spam!

Any one using a new transmitters?
I've been wanting to get my hands on a Graupner MZ-18 9Ch 2.4GHz HoTT Radio Combo S1005
•MZ-18 Transmitter
•2000Mah Ni-MH Transmitter Battery
•Mains Charger
•GR-24 Receiver
•GR-12L Receiver
•Neck Strap
•PC Interface Cable

All for under £250.00


Has anyone seen one in use?




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tombo242
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PostPosted: Thu Jul 09, 2015 5:34 pm
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Wish I could help Burgess, but this is the first I've heard of it. Never even seen one in real life.

Sorry,

Tom.
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Burgess
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PostPosted: Thu Jul 09, 2015 10:27 pm
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Thanks Tom, these are just a real nice piece of kit, I'm running out of excuses not to purchase one.

Here's what they're like:-
http://www.fast-lad.co.uk/store/product_info.php?cPath=27_30_838&products_id=27325



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tombo242
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PostPosted: Sat Jul 11, 2015 3:55 am
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Very nice Burgess,

I've just thought of 244.99 reasons not to buy one right now, having dropped my smart phone on the tiles I have some expensive repairs to do on it. It's a brand no one here has heard of so a digital glass and LED screen are on their way from China.

My van has a worrying clutch cable problem, occasionally acts like it's broken but both ends are solid. I think that it's the auto-tensioner giving up, it will lock back to normal if I lift the pedal up to max and let go! Trouble is there is no warning just a 'PING' and no clutch - lovely in traffic! Rolling Eyes

On the bright side the new 450 quad is coming along, that will run with my good old (refixed) DXi.

Maybe when things improve I'll give that TX more thought.

Tom.
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admiral
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Location: Brisbane, Australia

PostPosted: Sun Jul 12, 2015 3:12 am
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Tx looks good, too late for me though, I'm fully committed to DX9 it would cost me a fortune in Receivers to change over now. I'm also very happy with the DX9 does everything that I need and more.
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Burgess
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PostPosted: Sun Jul 12, 2015 7:38 pm
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Thanks Keith,

I was drawn towards the Spectrum DX9 before I saw the Graupner MZ-18.
Now I can get to remote flying sites I would indulge my old passion of slope soaring before I need to apply for Zimmer frame operators certificate.

Back in 1972 I designed and build a near scale glider based on the Hurricane, at the time this gave rise to some odd comments, that was before ‘Power Scale Soaring' (PSS) became a popular section of slope soaring. Had thoughts of doing near scale PSS of a helicopter, with the right foil section, number of blades, and disk size in constant auto rotation might just work. The problem would be getting the head up to operating speed prior to launching it.

Another option might be a non-rotary full disk parasol-wing constructed with compound foil sections.

Alternatively start smoking wacky backy and get high without wing..lol Razz






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PostPosted: Mon Jul 13, 2015 3:12 am
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Hi Burgess,

I was big into slope soaring about 20 years ago, my son and myself really enjoyed it, had a two channel 2 Super Trident 2500, that's what changed me from Mode 2 to Mode 1. Mode 1 you could fly with one hand and hold a beer in the other LOL.

With your scale helicopter glider, given that power gliders are fully acceptable I don't see why you couldn't build a very light weight helicopter with a small motor to get it flying and then Auto-rotate/Glide down.

Somewhere, can't remember where I have seen a kite with rotor blades, or is that a helicopter that was on a string and flew like a kite, anyway doesn't matter it flew so I believe your slope soaring helicopter is feasible.

Found one.

[/img]
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tombo242
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PostPosted: Mon Jul 13, 2015 4:48 pm
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Hi Folks,

Found a video or two on this, I knew I'd seen one.

https://youtu.be/JrH78bldJQc

or the simplest one of all:

https://youtu.be/Binpd07Tu8k

Tom.

PS Can't seem to get this YouTube thing to work using the YouTube button gives me just the text - no link.
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Burgess
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PostPosted: Mon Jul 13, 2015 7:36 pm
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Thanks for posting those links Tom.

That first video's really good, it would be interesting to know the foil section of those blades. My initial thoughts were to use blades with semi symmetrical foil section to operate at lower Reynolds numbers. Keith's right probably need some form of propulsion, the Sikorsky x2 design might hold possibilities.


Yeah, I've found that problem when trying to post youtube videos.



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tombo242
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PostPosted: Tue Jul 14, 2015 7:55 pm
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Hi Burgess,

I think the blades would have to be similar to a sailplane section, at least with some undercamber to aid lift at lower speeds. You will be in permanent autorotation so forget +ve pitch - well maybe just a little available for that last 10cm or so. Also the blades need to be similar to a prop with the drive angled to meet the different airspeeds along it's length.

Lots to think about, I definitely won't be trying to go slope soaring with a modified quad Shocked .

Tom.
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Burgess
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PostPosted: Wed Jul 15, 2015 4:29 am
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Thanks Tom

Yeah the span-wise variation in Reynolds numbers is something that came to mind first-off. Thought of using a foil section something like the Eppler 374. Also thought about the drive and driven regions of the blades, and have an idea I'd like to try.


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tombo242
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PostPosted: Wed Jul 15, 2015 7:10 pm
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Hi Burgess,

While I like that section for fixed wing, I think that some definite undercamber is required. Take a look at the E205 I feel it would be better.

Found this interesting study on Youtube. has some good home made testing gear.

https://www.youtube.com/watch?v=_25H9ZPE2So

Thought it might just be useful,

Tom.
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Burgess
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PostPosted: Fri Jul 17, 2015 3:58 am
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Yeah Thanks for the input Tom.

I did have thoughts to camber/modify the mean line of the 374 section. As the disk is going to be in constant autorotation it'll need to be at an angle just like autogyros, and the Sikorsky x2 with pusher prop would make an ideal subject but with only one main rotor, in say 600 size.


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tombo242
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PostPosted: Sun Jul 19, 2015 5:02 am
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Sounds good to me Burgess! Smile

Tom.
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