Jack Hyde

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A friend was selling out of RC stuff and I got a Bud Nosen Big Stick in a package deal. The plane is RTF without engine, servos,etc. It has flown before and looks like it hasn't been crashed. The airframe weighs 16 lbs and I guess it will weigh about 22 lbs RTF dry. the wing area is about 2100 sq inches. I have a G38 on a Bridi Big Bee. It looks to me that the G38 would work OK on the stick for a mild flying sport plane. Do I need more engine to fly the stick? I just want to put around but want to be able to take off without too much suspense.

RandyL

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Jack, I have no experience with the actual airplane. I have seen one and I have the plans and gear to build one when time allows... a G-38 is what I plan to use for average sport flying. I have a G-38 on a 7 1/2 ft span Ag-Cat bipe. It weighs what you predict your big stick will. The Ag-Cat flys great..I feared it would be underpowered with all the bipe drag...not so, it is a great combo.

Randy

Jack Hyde

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The G38 sounds like it is worth a try. I will let you know how it goes.

JimRoss

You're going to find out that the G-38 will be marginal only. I have one in a 14 pound Stinger 120 and it doesn't want to climb very well. I would look at a G-62 for that Big Stick.
Just my opinion.

RandyL

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Jim, I would think a G-38 would pull a 14 pounder fairly well. No doubt it won't do any unlimited vertical... Just for more info on the thread, I'm using a TopFlite Powerpoint 18 x 6-10 prop. It is the only prop I've ever used on the 2 airplanes the engine has been on..luckily I've never broken it so I don't have any more experience with props on the 38. Maybe a different prop or oil may get you going more?? Just a thought.
Here is my 20+ pound Ag-Cat flying through a big loop with smoke on..It is near 23 pounds now with the smoke system installed. Naturally I only do loops and rolls..nothing exciting. More on the G-38 powered Ag-Cat on my homepage..
I doubt that the huge stick will ever fly more than slow and easy..just too much wing to throw around very fast. She's a lunker but sounds like fun!
I agree with what you say..it should fly moderate.. A G-62 would haul it around very well also.

Jack Hyde

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Jim got me thinking so I did some searching. RCIGN said in a post 9/23/2002 that a G38 with a 20" prop should produce 22 lbs thrust. That ought to fly my plane. I ran a thrust calc using one of the online sites and got 15 lbs thrust at 7000 rpm for a 12" prop. I am not expecting the plane to accelerate while flying vertical.

JimRoss

The Stinger is the second plane I had the G-38 in and it flew both of them well. The first was a 17 pound Extra 300 XS and it(G-38) pulled the firewall out so I removed it and put my G-26 in it. Losing three pounds made it a real flier. It still screams like a banshee but won't climb out of sight. Oh Well. The other plane is the Stinger 120. It flies like a dream but also won't climb out of sight. Oh Well Again. I have been running a 20 X 8 APC on it all along until now. I broke it and the only thing I had to replace it with was a 20 X 8 MAS. It sucked so I put on an 18 X 8 MAS and it does ok. Need to go back to the APC props and stop jerking around. Or maybe an 18 X 6 MAS might help the rpm. Shrug!

Jack Hyde,

Those thrust calc programs are baloney. Heard too many people say they had vastly different results than what the program says. The way I check mine is to weigh the plane with a digital scale and then check the dynamic thrust on the ground with the same scale. It may not be deadly accurate but it gives me a ball park idea of what the plane is capable of, moreso than some calc program will.

Jack Hyde

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You say you have measured the static thrust produced by the G38. Would you please tellus what the results were?

JimRoss

When I had the engine on the Extra 300, it weighed 17 pounds 6 ounces and running with regular gasoline and 32:1 Lawnboy ashless oil, with a 20 X 8 APC prop turning right at 8000 rpm the digital scale showed right at 18 pounds of static pull on the ground. That was with it hooked to the tail wheel bracket, peaked up to maximum rpm and tied to a tree.
I don't know any other way to accurately measure the thrust of any engine. I do not believe the calc programs as they dont take into account the brand or type of propeller or the pitch. Only the size and rpm. We all know that different props provide vastly different amounts of thrust.
Also I am just barely above sea level, humidity in Texas is always high and the temperature was in the mid 80's on the day I checked the thrust.

That's the numbers I got.

Jack Hyde

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That is good info. You measured about what "RCIGN" said the G38 should produce. The thrust calculator at
hwww.lcrcc.net./thrust_calc.htm
computes 29 lbs of thrust at your conditions. Pretty optimistic.
So if a G38 produces 18 lbs of thrust I imagine it will haul my 22 lb stick with 23 oz/ft^2 wing loading off the ground and putt around OK. Or is there more to it?

JimRoss

Hi Jack, No pun intended.

The G-38 is not really suited to a 22 pound airplane. It will fly it but you won't be happy with the performance. It is a darn good reliable engine but it just ain't up to the task of that much weight.
I would go with a 50 to 60 cc engine to get the performance you want. I have my G-38 on my Stinger 120 and it is just right. The plane weighs 14 1/2 pounds and can take off in about 30 feet. Lands like a feather and flies great. Any more weight and it will not perform like you want it to.

The calc programs are full of baloney as far as Im concerned. What is the wingspan, weight and wing loading of the Big Stik? That will tell you what engine you need.

Jack Hyde

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Wing span =100", chord = 22". weight =16 lbs w/o engine. It has a HUGE wing.

JimRoss

Sounds like a BME 50 or Quadra 50 or G-62 to me. A G-38 won't have enough snot to blow in a rag on that airplane. About 14 to 15 pounds AUW is the limit for a G-38. More than that and you will have a lead sled. It just won't be fun to fly.

RandyL

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<<Hi Jack, No pun intended>>

I like that.... RLL

Bosshossv8

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I came across this old thread while searching for Bud Nosen Big Stik 101".

I have one that my Pop built, can you tell me where the CG is???? I can't find it on the plans, and my Pop has long since forgot.

BTW It has a 50cc Quadra ....Flew great 6 years ago. He built a few ...tried a 35 CC Quadra oon one and it flew , slow, but flew well enough to float around. The 50 made it aerobatic.

I want to fly this one , I have made her ready for flight, and need to know where the CG is.

Help!!!!!!!!!!!!!!!!

BALSA BANDIT

At this time I have 2 giant UGLY STICKS. One is an 8ft. wing andI am running a SACHS 4.2 it it and it flys very well except it is a bit nose heavy. Last night I moved the 32oz. tank back about 12 in. and will fly is again as soon as the rain gives us a break. My second Stick is a 10ft wing and it is under major reconstuction. I am putting barn door alir. on it and enlargeing the elev. so that I can fly 3D with it. I am installing a GT80 on the nose and installing a cowl just to make it look a little cleaner.

JimRoss

BossHossV8 Put the CG at about 28% MAC and fly it. Nose heavy flies again, tail heavy , well you get the idea.

Jack Hyde

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I haven't flown my Big Stick yet. I put in a barn and a steer managed to step on the horizontal stab. I plan to fix it and fly later. Keep the cows off your planes if possible.
Jack

RK-Aircraft

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A friend of mine has a G-62 on it. Flies great. Its a floater.