RE: New 50cc Yak

RE: New 50cc Yak
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RE: New 50cc Yak - 1/23/2006 5:35:49 PM

T. Bob

Posts: 1507
Joined: 2/19/2002
From: Munster, IN, USA
Status: offline

quote:

19 lb set-up

DA50
MTW Can
3.25 True turn
23-8 Mejzlik
8611's
2 Std servos
1-2700ma NiMH 4cell
2 2700ma MiMH 5 cell
all the rest is the stock stuff

19 lbs with a can and 3 MiMHs isn't that bad the TOCs are coming in a 18 1/2 on standard exhaust. These are big planes don't worry about the weight.

As for the wing area I've never thought of measuring my ARFs. When I get home I'm checking all of mine.

< Message edited by T. Bob -- 1/23/2006 5:38:08 PM >

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"This plane has no limits as to performance with this engine except vertical"

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Post #: 401

RE: New 50cc Yak - 1/23/2006 7:20:33 PM

aj and phoenix

Posts: 75
Joined: 10/11/2003
From: S, TN, USA
Status: offline

Deleted by AJ

< Message edited by aj and phoenix -- 1/24/2006 12:47:35 AM >

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AJ and Phoenix the Wonder Dog

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Post #: 402

RE: New 50cc Yak - 1/23/2006 7:59:00 PM

lsnover

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

quote:

ORIGINAL: aj and phoenix

Many of us "twits" believe that we should get what we pay for and nasty never enters the picture when we do. 5% less wing area and a 14% increase in weight may be OK for some, but the next "Twit" ought to know what they are getting before they shell out $500+. If name calling is sharing in a positive fashion, then I guess I am in the wrong place.

AJ:

Believing you should get what you pay for is fine. Even stating so is OK, but getting Nasty about it isn't going to help. Did you buy one of John's Yaks? If not, then you have little to complain about, since you can ride the coattails of those of us who plunked down our cash already. If you did, then by all means, state your problems. But we can be civil about it. Unless your being Nasty, I wasn't name calling. If that's your intent, then you can judge whether the shoe fits.

I have my issues, some might call them petty, others might not. I am working with John privately to address some issues, and it is my hope that he will make some adjustments for those of us who purchased "sight unseen", and make some corrections and clarifications in his advertising for the benefit of those who have not yet made a purchase.

I agree there are some discrepencies in what was advertised and what was delivered. I think ARFs are a relatively new area for John and his business and I'd like to give him some time to work things out. We can choose to act like "twits" while we do this, or act like adults.

Cheers!
Lee

(in reply to aj and phoenix)

Post #: 403

RE: New 50cc Yak - 1/23/2006 8:02:19 PM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline

Ok guys, please take the bickering to PM's between yourselves if that is what this is.

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Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to lsnover)

Post #: 404

RE: New 50cc Yak - 1/24/2006 1:58:24 AM

Edbaker

Posts: 62
Joined: 9/20/2002
From: Limington, ME, USA
Status: offline

I personally don't think that sealing all the holes is necessary. I've been running Comp ARF planes for 3 Years which have the pipes right inside the fuse had have had no problems. I will seal off the holes right over the pipe, and would probably not recommend mounting the receiver right over the pipe. Make sure you cut out the air outlet in the bottom of the fuse. As far as the airflow, the only time I flew mine it was only 28 degrees F. No overheating problems.

< Message edited by Edbaker -- 1/24/2006 1:59:08 AM >

(in reply to kevinc)

Post #: 405

RE: New 50cc Yak - 1/24/2006 2:11:31 AM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline

quote:

ORIGINAL: Edbaker

I personally don't think that sealing all the holes is necessary. I've been running Comp ARF planes for 3 Years which have the pipes right inside the fuse had have had no problems. I will seal off the holes right over the pipe, and would probably not recommend mounting the receiver right over the pipe. Make sure you cut out the air outlet in the bottom of the fuse. As far as the airflow, the only time I flew mine it was only 28 degrees F. No overheating problems.

It's hard to see but if you look closely at the pics he only has the holes covered over in front of and behind the wing tube and probably under the fuel tank. Using 1/16th balsa and thick CA should add maybe an ounce at most and if you have some, C?F sheeting would just look way too cool.

I spoke to John today and for the pipe mounting he told me he used plastic tie wrapped inside of fuel tubing and mounted the pipe to the underside of the tank floor. He said they have been flying all season like this with no problems and that's in Florida on the west coast just south of Tampa.

If amyone needs a Da50 or a Brison 3.2 template I have them and you can get them from here. They are in PDF format so you will need Adobe reader at the minimum

DA-50 Template

Brison 3.2 Template

< Message edited by bubbagates -- 1/24/2006 2:12:09 AM >

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to Edbaker)

Post #: 406

RE: New 50cc Yak - 1/24/2006 2:18:25 AM

Edbaker

Posts: 62
Joined: 9/20/2002
From: Limington, ME, USA
Status: offline

It certainty was not my intension to cause trouble when I posted my flight report and weight of my plane. Although the weight is more than advertised I personally don’t think it’s as much of a problem as some do. Did everybody see the part about how well the plane flies and how nice the kit is. I guess I was hoping for more positive feedback.

(in reply to Edbaker)

Post #: 407

RE: New 50cc Yak - 1/24/2006 2:28:19 AM

africanmike

Posts: 81
Joined: 1/23/2005
From: sarasota, FL, USA
Status: offline

Hey guys.
The weather was still too bad (windy) for proper flight testing and aerodynamic trimming for IMAC.
I flew both saturday and sunday never less than 10 mph winds and up to 16.
Built stock with DA50 and stock muffler she is tail heavy of this I am sure.
Mine is built with all stock hardware except for robarts hinges in place of ca.
as stated I have a DA 50 with stock muffler a 3.5 tru-turn spinner. NX 22X8 prop, 4.8 V 2700mah battrey (ignition) 6.0V 2700mah battery (reciever) both NIMH, no pilot, dash, or canopy floor.
with 4 ounces of lead on the engine stand-offs and about 10 Fl ounces of gas she weighed 18 lbs.
I went and bought a lite weight tail wheel assembly from troybuilt to solve tail heaviness, I really need my birds on the nose heavy side for IMAC. I'll maybe install another battry later for redundancy and nose weight.
even though she's tail heavy she needs up trim for level flight an pitches slightly with change in throttle position, leading me to believe she has thrust line issues.
I mixed 5% opposite aileron to rudder for knife edge and she also appears to pull to wheels in knife edge as this can also be an indication of too much down thrust I haven't mixed it out yet.
I'm gonna get C.G. nose heavy first and then tackle thrust, I might also have to back to a 22X8 prop as ballooning up got worse after changing to a 23X8 prop and approaches started to get scary yesterday as I had to give down elevator to get her safely back to the runway, 15 mph winds were not exactly helpfull either.
One cowl mount screw came loose and one wheel collar( my fault) no other faults have been noted after 12 flights but I will remove cowl and check engine box thouroughly before I fly her again. This is allways prudent to do after about 10 flights any way.

As there is no dynamic airflow though fuse I didn't bother to seal it off from engine air flow . I did cut out holes of bottom of cowl for cooling and after one dead stick landing, (I think engine over heated) I'm considering choking the top half of the cowl entry and cutting a slot in cowl just in front of engine head.

Other than that I'm pretty satisfied. I probably won't get to fly for two weeks and by then lots of you should be flying

and hopefully a few of you will set her up for IMAC and share your findings with me.
Till then
"Just build the damn thing and go fly it"

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Post #: 408

RE: New 50cc Yak - 1/24/2006 2:32:51 AM

T. Bob

Posts: 1507
Joined: 2/19/2002
From: Munster, IN, USA
Status: offline

Any finished pics?

_____________________________

"This plane has no limits as to performance with this engine except vertical"

(in reply to africanmike)

Post #: 409

RE: New 50cc Yak - 1/24/2006 2:37:11 AM

bubbagates

Posts: 8162
Joined: 5/30/2004
From: Elizabethtown, PA, USA
Status: offline

quote:

ORIGINAL: Edbaker

It certainty was not my intension to cause trouble when I posted my flight report and weight of my plane. Although the weight is more than advertised I personally don’t think it’s as much of a problem as some do. Did everybody see the part about how well the plane flies and how nice the kit is. I guess I was hoping for more positive feedback.

Ed,

I did and am pleased that even at that weight on a 50Cc engine it still did well. I actually thought to myself that if I can keep mine at 17lbs I ought to be pleased as punch. I'm almost ready but my header is on backorder so I'm in hold mode anyway.

< Message edited by bubbagates -- 1/24/2006 3:09:09 AM >

_____________________________

Bill James
Normal is not something to aspire to, it's something to get away from

(in reply to Edbaker)

Post #: 410

RE: New 50cc Yak - 1/24/2006 2:39:00 AM

sukhoi-26

Posts: 55
Joined: 6/12/2005
From: Palm Harbor, FL, USA
Status: offline

Hey T what's up. Rob

(in reply to T. Bob)

Post #: 411

RE: New 50cc Yak - 1/24/2006 3:55:05 AM

lsnover

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

Hey Guys:

Just a little update on the Axle weights. Those big collars are actually aluminum as someone pointed out. They actually weigh less then smaller Dubro 3/16" Collars, by a few grams. The Axles are big and heavy. Does anyone know of a company that makes aluminum axles?

FYI, Radioshack makes a nifty little USB Scale that's good up to 10lbs. It's on clearance right now for $19.99. Perfect for weighing these bits and pieces.

Regards,
Lee

(in reply to sukhoi-26)

Post #: 412

RE: New 50cc Yak - 1/24/2006 4:01:08 AM

T. Bob

Posts: 1507
Joined: 2/19/2002
From: Munster, IN, USA
Status: offline

My TOC is a inch shorter on the wing span. These companies are probably not compensating for the clamshell design. That calculates down to 1,398 sq. in. using that ThrustHP Calculator.

< Message edited by T. Bob -- 1/24/2006 4:05:19 AM >

_____________________________

"This plane has no limits as to performance with this engine except vertical"

(in reply to lsnover)

Post #: 413