RE: New 50cc Yak  
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RE: New 50cc Yak - 1/14/2006 4:23:03 PM   
lsnover


 

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Joined: 4/29/2002
From: Bath, PA, USA
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quote:

ORIGINAL: red_z06

I think a good candidate is just over the horizon. BME55 weighting a tad over 2lb bare is said to arrive come sping. Until that time, DA will have to do. I expect everyones plane bare would weigh around 10.5lb assuming all wood was cut from same batch. Using all stock, 17lb for slimline adn 17.5lb for canister seems like where its going to be. Those who are willing to spend extra $200 will be rewared with 1/2lb savings using CF. Another 5oz or more can be saved using small lipo setup that I'm currently using PW Extra with DA50. I believe total batteries including switching regulator was 6oz as opposed to 11oz for 4cell aa ignition and 5cell aa receiver pack.

The axle was quite heavy (1/4" shaft) and switching to GP or dubro axle would alone save you 0.5oz. It is a monster of an axle enough for 40% bird.



Red:

I'm ordering a bunch of bling from Troy built. Not sure where you are getting your batteries at that weight. I typically run a single 3000mah 6 volt Nicad for the receiver and a 800mah 4.8 volt for the receiver on my large planes. The two batteries and switches come in at right about 1lb 2oz. If I go with three 7.4volt Lipos with 3 miracles switches from troy the total weight is (4.5 x 3)= 13.5 oz , for a total savings of about 4.5 oz, of course I will have a redundant reciever pack and longer times between charges. I'm getting the CF tube and the Kavan 4" wheels, plus the MTK Canister setup. I'm holding on the gear, because the gear they have is 1" shorter, and requires the CF tail gear to keep the angle of attact the same. The stock tail is only 1oz and the CF gear is .6 oz, not that big a difference. I may anty up for this combination later, as it will save about 4.5oz over the stock config. I'm on the fence at the moment. You really pay dearly to lose those last few ounces.

Regards,
Lee

(in reply to red_z06)
       Post #: 226

RE: New 50cc Yak - 1/14/2006 7:23:34 PM   
tashley



Posts: 1267
Joined: 4/24/2003
From: Manvel, TX, USA
Status: offline 		Red, man you're right about the axles. I just might have to whip some up out of some aircraft aluminum round stock. I haven't weighed them yet but they are H E A V E Y!

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RE: New 50cc Yak - 1/14/2006 7:29:37 PM   
red_z06



Posts: 511
Joined: 6/30/2003
From: Dumont, NJ, USA
Status: offline 		Yup! Little things add up.

I just compared stock tail gear with one from H9 Extra 260 CF stock Gear.

1.8oz for Aerotech and 0.6oz for H9. 1.2oz difference.



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       Post #: 228

RE: New 50cc Yak - 1/14/2006 7:31:50 PM   
tashley



Posts: 1267
Joined: 4/24/2003
From: Manvel, TX, USA
Status: offline 		I'm sure but I just can't bring myself to sheleve the tail gear, it's a thing of beauty. I guess I'll have to find another area to shave the weight.

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RE: New 50cc Yak - 1/14/2006 7:39:31 PM   
lsnover


 

Posts: 629
Joined: 4/29/2002
From: Bath, PA, USA
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quote:

ORIGINAL: tashley

I'm sure but I just can't bring myself to sheleve the tail gear, it's a thing of beauty. I guess I'll have to find another area to shave the weight.


I'm sure you get a few bucks for it on RCU or Ebay. ;-)

They are nice looking.


(in reply to tashley)
       Post #: 230

RE: New 50cc Yak - 1/14/2006 8:06:28 PM   
Aerotech


 

Posts: 719
Joined: 7/30/2002
From: St. Ptersburg, FL, USA
Status: offline 		Hello,

We always struggle with weights. But from a manufacturing standpoint. We have chosen to make the lightest plane possible without taking away from the strength. We chose to make the fuselage bottom foam sheeted and not stringers due to customers saying Im tired of putting their fingers through the fuselage, to making the gear from a better grade of aluminum rather than lighter aluminum that will not last and the list can go on. We want folks to have a tuff, light, high performance plane to do whatever you want. The video on our site shows how stable the plane is and will perform IMAC and 3D as good as anything going. After 14 years in this business, its always a blast to come up with new items.

Thanks

John

www.aerotech-rcmodels.com

(in reply to lsnover)
       Post #: 231

RE: New 50cc Yak - 1/14/2006 8:15:48 PM   
lsnover


 

Posts: 629
Joined: 4/29/2002
From: Bath, PA, USA
Status: offline
quote:

ORIGINAL: Aerotech

Hello,

We always struggle with weights. But from a manufacturing standpoint. We have chosen to make the lightest plane possible without taking away from the strength. We chose to make the fuselage bottom foam sheeted and not stringers due to customers saying Im tired of putting their fingers through the fuselage, to making the gear from a better grade of aluminum rather than lighter aluminum that will not last and the list can go on. We want folks to have a tuff, light, high performance plane to do whatever you want. The video on our site shows how stable the plane is and will perform IMAC and 3D as good as anything going. After 14 years in this business, its always a blast to come up with new items.

Thanks

John

www.aerotech-rcmodels.com


John:

I would agree with the fingers through the bottom statement, and the plane seems quite sturdy, and very nice looking.

It would be nice if you guys could offer an option kit with CF goodies included as a substitute for the heavier standard stuff. At least we wouldn't be paying for certain parts twice and just having them sit around. ;-)

I'm hopefull it will fly as good as it looks.

Regards,
Lee


(in reply to Aerotech)
       Post #: 232

RE: New 50cc Yak - 1/14/2006 10:59:53 PM   
torqmeister



Posts: 489
Joined: 2/29/2004
From: henderson, TX, USA
Status: offline 		They did.
quote:

ORIGINAL: T. Bob

No I'm just curious.
No offense I just hate it when guys add up parts and think thats the total weight.
It always heaver when it's all together.
I 'm interested because I have a TOC @ 18lbs.
These 30% Yaks are so big its amazing how EF models came in so light, or maybe they didn't?
If you can get yours in the 17 range thats great, keep us posted.



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       Post #: 233

RE: New 50cc Yak - 1/14/2006 11:10:56 PM   
lsnover


 

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From: Bath, PA, USA
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quote:

ORIGINAL: torqmeister

They did.


Since you can't get them any more it's a moot point for new customers.


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       Post #: 234

RE: New 50cc Yak - 1/14/2006 11:25:29 PM   
red_z06



Posts: 511
Joined: 6/30/2003
From: Dumont, NJ, USA
Status: offline 		isnover

Kokam 3cell 1500mah pack @ 3.7oz
Kokam 2cell 1500mah pack @ 2.5oz
Medusa Potencia 6v switching regulator 0.7oz

Total 6.9oz

This excludes 2 switches.

The ignition is run on 2 cell lipo direct ( about 400 flight at 16min each over 2 years but kids don't do this at home )
The receiver is run on 3 cell lipo with the switching regulator. The main advantage of switching regulator is that it does not waste energy like linear regulator does during regulation process.
If the current drain on receiver side is 1amp at 6v, the battery only needs to pump out 0.5amp at 12v. Because you do not waste energy you can connect 4cell lipo directly too. Actually the regulator works up to 40v as it is typically used on high powered electric planes. A similar device is called UBEC and is very popular.

Because 3cell 1500mah acts as a 6v 3000mah battery, more than 8 flights are possible without charge. Instead, I sometimes use 3cell 1000mah foamy battery as a receiver pack and still get over 6 flights. The nice part is that due to 1c charge capability of most lipos it only takes 10-20min charge after 3 flights to keep it topped up.

The charger I use is Triton and AccuCycle Elite. Either will field charge lipo batteries.




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       Post #: 235

RE: New 50cc Yak - 1/14/2006 11:29:38 PM   
red_z06



Posts: 511
Joined: 6/30/2003
From: Dumont, NJ, USA
Status: offline
quote:

ORIGINAL: tashley

I'm sure but I just can't bring myself to sheleve the tail gear, it's a thing of beauty. I guess I'll have to find another area to shave the weight.



I will end up using stock tail gear although I have h9 cf tail gear in my hand. I will be doing some hard pullup to hover upon takeoff and the stock tail will take the punishment better
Same goes for tail first harrier landings.

After I stop doing the harrier landings, I'll probably swap out to H9 CF tail gear or graphtech gear.


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       Post #: 236

RE: New 50cc Yak - 1/14/2006 11:44:32 PM   
lsnover


 

Posts: 629
Joined: 4/29/2002
From: Bath, PA, USA
Status: offline
quote:

ORIGINAL: red_z06

isnover

Kokam 3cell 1500mah pack @ 3.7oz
Kokam 2cell 1500mah pack @ 2.5oz
Medusa Potencia 6v switching regulator 0.7oz

Total 6.9oz

This excludes 2 switches.

The ignition is run on 2 cell lipo direct ( about 400 flight at 16min each over 2 years but kids don't do this at home )
The receiver is run on 3 cell lipo with the switching regulator. The main advantage of switching regulator is that it does not waste energy like linear regulator does during regulation process.
If the current drain on receiver side is 1amp at 6v, the battery only needs to pump out 0.5amp at 12v. Because you do not waste energy you can connect 4cell lipo directly too. Actually the regulator works up to 40v as it is typically used on high powered electric planes. A similar device is called UBEC and is very popular.

Because 3cell 1500mah acts as a 6v 3000mah battery, more than 8 flights are possible without charge. Instead, I sometimes use 3cell 1000mah foamy battery as a receiver pack and still get over 6 flights. The nice part is that due to 1c charge capability of most lipos it only takes 10-20min charge after 3 flights to keep it topped up.

The charger I use is Triton and AccuCycle Elite. Either will field charge lipo batteries.




Red:

I never heard of a regulator that works that way. Where can I get more information on this setup? The only down side I can see is you do not have a redundant pack and switch the way the Troy Built setup would allow.

I'd also be concerned about running the ignition over 6volts. I don't believe DA recommends this.

Regards,
Lee

(in reply to red_z06)
       Post #: 237

RE: New 50cc Yak - 1/15/2006 12:38:56 AM   
africanmike


 

Posts: 81
Joined: 1/23/2005
From: sarasota, FL, USA
Status: offline 		hi guys
The weather sucked in florida today so I got quite a bit done.
Don't use the supplied screws to fasten the y shaped part of tail gear to the rudder all three of mine broke the heads right off as soon as they started to pull up. I then had a hell of a job getting the screw out with a vise grip, I then used 4-40 socket head screws to secure the bracket. the screws that secured the tail wheel bracket to the vetical stab were fine, just beware there are two holes in the wood near the front of the cut out , locate and avoid them when mounting the tail wheel.

Why the obsession with weight? build the thing and fly it.

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