Over Powering Planes  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       

All Forums >> RC Airplanes >> Aerodynamics >> Over Powering Planes
Page: [1] 2 3   next >   >>  

Login
Message << Older Topic   Newer Topic >>
Over Powering Planes - 2/11/2003 5:19:15 AM   
HOOTER



Posts: 145
Joined: 11/10/2002
From: Jackson, TN, USA
Status: offline 		Hey Guys,

I know there are some general rules about engine sizes as far as the size of plane. But lets take for example you added a lot of weight to a rebuild (40 size crashed plane) . Is there a rule of thumb as far the amount of weight added to the increase of engine. I realize this depends on the plane design, but I do not want to rebuild a plane and it turns out to be a brick?

General theory's will be appreciated.

_____________________________

West Tennessee RC Club
AMA 736308
       Post #: 1

Over Powering Planes - 2/11/2003 9:13:05 AM   
AQ500



Posts: 692
Joined: 5/22/2002
From: Sandy, UT, USA
Status: offline 		I'm a higher altitude flier and you will see many of the planes flying with the largest recommended engine and bigger. You will even see 60's on 40 size planes around here. In my case 90's on 40 size planes and 40's on 25 sized planes.

I would think that a crashed and repaired trainer would fly with the highest recommended engine. If not you are starting to get a bit heavy and the plane will be a little harder to handle. If you do put on a bigger engine you will want to make sure the balance of the plane will also be correct. This might involve moving the flight equipment rearward, or adding ballast to the tail.

(in reply to HOOTER)
       Post #: 2

Over Powering Planes - 2/11/2003 9:25:56 AM   
AQ500



Posts: 692
Joined: 5/22/2002
From: Sandy, UT, USA
Status: offline 		I was going to say how I pick my engines, but I'm sure what I would say would get me in trouble.

(in reply to HOOTER)
       Post #: 3

Over Powering Planes - 2/11/2003 12:38:47 PM   
BMatthews



Posts: 9053
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		I had a big answer too but in the end I decided to keep it. It basically said that if it's that heavy then perhaps it's time to retire it. Sure you'll get it airborne with enough power but it wouldn't be any fun to fly if it actually needs that much extra.

I know that's not what you wanted to hear but that's what I think.

_____________________________

Witty saying to be plagarized shortly.....

(in reply to HOOTER)
       Post #: 4

Over Powering Planes - 4/21/2003 6:46:59 PM   
e-bird


 

Posts: 204
Joined: 4/20/2003
From: Sacramento,ca
Status: offline 		I fly elec and even in elec bigger motor is better so they say
everyone trys to move a brick at 500mph. CU

(in reply to HOOTER)
       Post #: 5

Over Powering Planes - 4/21/2003 7:57:54 PM   
Steve Guinn



Posts: 835
Joined: 8/23/2002
From: WV
Status: offline 		[QUOTE] Over Powering Planes [/QUOTE]

[SIZE=3]Yes[/SIZE]

_____________________________

"The weather is here, wish you were beautiful."
J. Buffett

(in reply to HOOTER)
       Post #: 6

Over powering planes - 4/21/2003 9:21:38 PM   
Tall Paul



Posts: 4725
Joined: 6/23/2002
From: Palmdale, CA, USA
Status: offline 		Some of the funnest to fly are.

(in reply to HOOTER)
       Post #: 7

Over Powering Planes - 5/4/2003 12:52:44 PM   
Joojoo


 

Posts: 14
Joined: 5/3/2003
From: Gainesville, FL, USA
Status: offline 		What happens when the engine quits?

Now you have an overweight airframe with a humongous engine on the nose. Chances of making the field in a deadstick are slim

Granted the glide path will not change with weight, but the airplane will have to fly a lot faster to maintain a specific angle of attack. Otherwise, at a constant speed, the angle of attack will be higher and closer to stall. I suppose the answer to the question really depends on flying style, but I have found that every ounce of additional weight on my airplanes detracts from the flying qualities.

(in reply to HOOTER)
       Post #: 8

Over Powering Planes - 5/4/2003 4:56:03 PM   
SST



Posts: 1151
Joined: 6/26/2002
From: Mt. Morris, MI, USA
Status: offline 		The .60 on a .40-size plane may be just the thing to save it one day when you over-rotate on takeoff, or have to do a quick waveoff on final...My SST .40 has a K&B .61 on it. Thats why we have a throttle.

_____________________________

Rule #1: Always know when to get out of Dodge.
Rule #2: Always know HOW to get out of Dodge.

(in reply to HOOTER)
       Post #: 9

Over Powering Planes - 5/4/2003 7:21:34 PM   
mikerolls37


 

Posts: 56
Joined: 3/5/2003
From: Haslemere, UNITED KINGDOM
Status: offline 		There are two aspects to this. Firstly, too much power, like too much airspace below you, is virtually impossible to achieve. As has been said - that's why we have throttles.
Second point is weight. A model which is overweight is bad news - and a much repaired model may well fall into that category. The problem, most aspects of which have already been mentioned - is the wing loading. A typical 40 size trainer with a wing loading of around 16-18 ounces per square foot (provided the basic design and the trim are sound, of course) is a *****cat to fly. A model that size with a loading of, say, 30 ounces per square foot is quite a handful.
The bigger the model is, the higher the wing loading can be and still give comfortable flying characteristics.

Mike

(in reply to HOOTER)
       Post #: 10

Over Powering Planes - 5/4/2003 7:23:55 PM   
mikerolls37


 

Posts: 56
Joined: 3/5/2003
From: Haslemere, UNITED KINGDOM
Status: offline 		What a strange outlook you Americans have. a "pus sy cat" in this context , is something which is simple straightforward, non-taxing. Why not leave English to those who invented it?

Mike

(in reply to HOOTER)
       Post #: 11

Over Powering Planes - 5/4/2003 8:06:37 PM   
Strat2003


 

Posts: 634
Joined: 3/9/2003
From: Mt. Pleasant, OH, AFGHANISTAN
Status: online 		If it's over powered and overweight, it's not a trainer anymore, is it?

Regarding the term "*****cat"...maybe I've been misunderstanding the meaning of the term all along, lol!

(in reply to HOOTER)
       Post #: 12

Over Powering Planes - 5/4/2003 8:38:06 PM   
dick Hanson



Posts: 10271
Joined: 12/12/2001
From: slc, UT, USA
Status: online 		I thot the French invented English--

(in reply to HOOTER)
       Post #: 13

Over Powering Planes - 5/4/2003 10:04:43 PM   
BMatthews



Posts: 9053
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		We have an overactive obscenity filter that sometimes butts in where it's not needed. But the *'s add color, don't you think

_____________________________

Witty saying to be plagarized shortly.....

(in reply to HOOTER)
       Post #: 14

Over Powering Planes - 5/4/2003 10:43:21 PM   
e-bird


 

Posts: 204
Joined: 4/20/2003
From: Sacramento,ca
Status: offline 		The glue and used in building a we bit stronger probly last
8-10 hard crashes. But I have achived getting my elec doun in weight new outrunner brushless and lipoly batterys always trying
not as much as free flight like you say. CU

(in reply to HOOTER)
       Post #: 15

Over Powering Planes - 5/5/2003 12:07:58 AM