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All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> Yard bee gasser
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Yard bee gasser - 5/25/2003 11:43:58 AM   
Bipe Flyer



Posts: 4983
Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline 		That sounds good, but I'd go with a 2oz tank and stick with the 7X3 for the .074.

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Yard bee gasser - 5/25/2003 9:21:59 PM   
GotCoffee66



Posts: 122
Joined: 12/16/2002
From: Twentynine Palms, CA, USA
Status: offline 		I was thinking of the 2 oz and looked at them when I was at the LHS. Had it in my hand and almost bought it. LHS is too far to go back to so next Tower order, I'll probably get a 2 oz. According to the Norvel site, should last about 6 min WOT on one oz.

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Ray

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Yard bee gasser - 5/25/2003 11:43:02 PM   
RysiuM



Posts: 1413
Joined: 4/22/2003
From: Elk Grove, CA, USA
Status: offline 		I have 2 oz tank in my Bee, not because I need it (I can get at least 15 min full throttle on BigMig .061 from it), but because it was the lightest tank I could get. I don't remember the brand, but this is the kind that has 2 plastic nipples (vent and optional fueling line) and one small hole for the cork with engine line. This empty tank weights less than 1/2 oz - all other brands weight at least 1 oz empty (even 1 oz size). So my choice was not the capacity, but the least total flying weight.

And you are right. .074 will fly fine on 7x3. But I suggest at least to try 7x4 because you might get a better thrust. You will never find out unless you try it.

I calculated that 6x2 on .061 I will bet the best static thrust, but I couldn't get unlimited vertical. So I tried 7x3 and it turned out, that it is the best choice. So don't trust your calculations - try different props, put them on the plane and fly it. See for yourself, what is the best choice.

RysiuM

< Message edited by RysiuM -- May 25 2003 6:51PM >

(in reply to GotCoffee66)
       Post #: 28

Yard bee gasser - 5/25/2003 11:53:24 PM   
GotCoffee66



Posts: 122
Joined: 12/16/2002
From: Twentynine Palms, CA, USA
Status: offline 		The fuel tank I got is a Sullivan round tank. Weighting it on the cheap Wal-Mart scale, it weights about an ounce in the bag. The one you have, is it round, square or a slant? Clear or white plastic? I have just about all the 2 oz tanks on my wish list a towers and none has a weight. LHS had the Sullivan square with the orange label so probably about the heaviest one made.

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Yard bee gasser - 5/26/2003 5:29:51 AM   
Bipe Flyer



Posts: 4983
Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline 		RysiuM
The tank you described is a Hayes. They are the best small tanks available IMO.

A 7X3 will produce more thrust than a 7X4.

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Club Saito #151

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Yard bee gasser - 5/26/2003 11:53:03 AM   
RysiuM



Posts: 1413
Joined: 4/22/2003
From: Elk Grove, CA, USA
Status: offline 		[QUOTE]Originally posted by Bipe Flyer
RysiuM
A 7X3 will produce more thrust than a 7X4. [/QUOTE]

By the book, you are right. Less drag gives more rpm therefore more static thrust. That's the theory. By this rule I put 10x4 on my PBF (to got the most static thrust from my old COMO 40). It was flying kind of well. But when I broke the prop and had nothing else, that 10x6. I tried it. It was the blast.
I think, that even with more (by theory) static thrust, 10x4 didn't give "enough wind" . 10x6 made my PBF fly like PBF supposed to.
I don't want to argue with you. I have never tried Norvel .074 and I'm sure you are right: 7x3 works much better in your application. My point is, it doesn't hurt to try. O yes, it cost $1.50 for the prop if it turns out to be not good at all. But in some airplane configuration it might be worth to experiment a little. Especially in a "fun type" planes.
I have other plane with .061 (scratch built PZL-104 Wilga) and of all props I tried this little baby likes 6x2 the most, which just didn't work on my Bee at all.

I'm sure 7x3 will be the best starting point, but what the heck, try other and feel how you Yard Bee flies.

RysiuM

(in reply to GotCoffee66)
       Post #: 31

Yard Bee Engine - 5/28/2003 5:54:12 PM   
FrancisPerson


 

Posts: 689
Joined: 12/14/2001
From: Germantown, MD, USA
Status: offline 		My first Yard Bee weighed 14 oz (HEAVY Clancy wood) and used a PAW .03 diesel r/c. It was plenty peppy and lots of fun. I now have an electric powered Yard Bee built from plans with wood that I selected (Sig contest balsa) and it weighs 10.5 oz. It is a great airplane. A norvel .074 would be way over the top power wise and the weight would be good. A light weight Yard Bee is a Joy to fly. Try a Norvel .061 and keep the weight below 11 oz and see what I mean. The PAW .03 weighs 2.3 oz. A Norvel .061 weighs 1.8 oz. KEEP it LIGHT !!! You will love the results.


Oily in Germantown

Francis

(in reply to GotCoffee66)
       Post #: 32

Yard bee gasser - 5/28/2003 8:30:14 PM   
GotCoffee66



Posts: 122
Joined: 12/16/2002
From: Twentynine Palms, CA, USA
Status: offline 		I rec'd my radio from tower yesterday and the battery pack it came with weights 2 oz on my cheap scales. Is there a lighter battery back I can get or is this normal? The flight pack info is below
http://www2.towerhobbies.com/cgi-bin/WTI0001P?&I=LXUZ92

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Yard bee gasser - 5/28/2003 8:36:10 PM   
BuzzBomber



Posts: 2642
Joined: 12/17/2002
From: Newton, NJ, USA
Status: offline 		There are 110maH and 150 maH Nicd Rx packs available. They will be lighter, but the drawback will be shorter time between charges, obviously. These packs will weigh about 1.2 or 1.3 oz. IMO, I bet you'll be fine with the 270 maH pack they gave you. SRbatteries or Balsa Products or Aeromicro should also have what you're looking for.

< Message edited by buzzbomber -- May 28 2003 3:43PM >

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Yard bee gasser - 5/28/2003 9:21:16 PM   
Digger-RCU



Posts: 464
Joined: 8/21/2002
From: Hanford, CA, USA
Status: offline 		Because everybody needs to give their input.

For the 074 norvel, I have found that in most situations, I like the APC 6.3x4 seems to give good speed and nice torque. I have run apc 7x4 on my 074's, but they bog down and heat up.

for the 061, I like the apc 5.7x3 this little prop gives good torque, while keeping the engine spinning nicely. I have run smaller props for all out speed, but the 5.7x3 seems to work great in most situations.

I stay away form most Master I'mscrewed props for the norvels. they just dont seem to produce enought power for the given application.

Generally speaking I have found that for the norvels, they seem to like to spin FAST. If you overprop them, and they slow down, you will be losing power and getting too hot.


Randy (Digger) Birt

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Yard bee gasser - 5/28/2003 9:40:13 PM   
BuzzBomber



Posts: 2642
Joined: 12/17/2002
From: Newton, NJ, USA
Status: offline 		Hey digger,

quick question for ya. I've got a coupla norvels I haven't even run up yet, and I've seen the consensus is that they like APC props better. The APCs I've seen at the LHS (sheesh, enough acronyms ) have the hole drilled larger than the propshaft on the norvels, ie it would fit my OS .10. Have you seen APCs with the right hole, or do you shim them with fuel tubing or something similar? GotCoffee, sorry to hijack your thread like that.

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Yard bee gasser - 5/28/2003 10:32:28 PM   
RysiuM



Posts: 1413
Joined: 4/22/2003
From: Elk Grove, CA, USA
Status: offline 		[QUOTE]Originally posted by buzzbomber
There are 110maH and 150 maH Nicd Rx packs available. They will be lighter, but the drawback will be shorter time between charges, obviously. These packs will weigh about 1.2 or 1.3 oz. [/QUOTE]

For small and light planes I use 5 x 370mAh NiMH. They weight about 1.2oz, 6V gives extra torque and speed from micro servos.
For even lighter applications (like 5oz plane) I use 4 x 150mAh NiMH. The pack weights about 0.4 oz. I found, it has have enough current for 2 HS-55 + GWS receiver and charge last for a couple flights.

And yes, keep it light. This Monday I had very intense take off with my Bee. Wind gust slammed it to the ground, but because it's light there were not even a scratch. I started engine and I was flying again.

RysiuM

(in reply to GotCoffee66)
       Post #: 37

Yard bee gasser - 5/28/2003 10:41:23 PM   
Bipe Flyer



Posts: 4983
Joined: 11/6/2002
From: Mission, BC, CANADA
Status: offline 		I always use the Hitec pack you posted. If I want to save weight I get a 270 NiMH pack so I can use the same charger.(non-peak)

Yes you need to bush the APC props. A piece of fuel tubing works fine. A couple of layers of heat shrink tubing over the bolt works also.

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1/2A all the way!
Club Saito #151

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Yard bee gasser - 5/28/2003 10:52:58 PM   
BuzzBomber



Posts: 2642
Joined: 12/17/2002
From: Newton, NJ, USA
Status: offline 		thanx, bipe flyer. I was just a little apphrehensive...thinking about vibration at high rpms if I did it incorrectly.

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Matt Smith
If you''re not having fun, you''re missing the point.

(in reply to GotCoffee66)
       Post #: 39

Yard bee gasser - 5/28/2003 11:10:50 PM   
Digger-RCU



Posts: 464
Joined: 8/21/2002
From: Hanford, CA, USA
Status: offline 		Buzz, The 5.7x3 has a shim that needs to be supplied when you buy the prop. (even with the shim you need to use a piece of fuel tubeing) Without the shim, you will have a tough time getting that prop to work.

the 6.3x4 has no shim made for it, and you must shim thee shaft, but that prop almost fits properly, and doesnt need much shimming.

Randy (Digger) Birt


Ps. trying not to go off on too much of a tangent on this thread, the apc 4.2x2 (a prop designed for 020 engines) does not fit the cox 020 shaft at all. I had to make my own shim from a ground down dremel cutting disc. I cantt figure out why they would make the hole in that prop so large. You cant use it for anything else!

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Yard bee gasser - 5/28/2003 11:28:07 PM   
BuzzBomber



Posts: 2642
Joined: 12/17/2002
From: Newton, NJ, USA
Status: offline 		Oh, c'mon. We're not off-topic, really. You see, the .049 norvel I've got is going on a 24" w.s. clancy ladybug (a distant relative of the yardbee) if I ever get around to building it. So you see, it's all inter-related somehow. ps, I picked up some zinger 6x3 and 6x4 props in lieu of apcs for now (these have the hole drilled right, but I've never used them before--just couldn't resist a wood prop). And GotCoffee, best of luck with your bee! Let us all know how it goes when its together!

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Matt Smith
If you''re not having fun, you''re missing the point.

(in reply to GotCoffee66)