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Pro and Cons of overpowering
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«
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February 27, 2011, 08:57:16 PM »
carloz
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Pro and Cons of overpowering
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hi all,
saw these posts , how smart or safe is this? apparently a lot of ppl seem to be doing this
www.rcuniverse.com/forum/m_7912128/anchors_7912189/mpage_1/key_/anchor/tm.htm#7912189
www.rcuniverse.com/forum/m_7912128/anchors_7922376/mpage_1/key_/anchor/tm.htm#7922376
so according to the above posts, can we put a lets say 90 4stroke on a 46size yak 3d? has anyone here done something like this?
your views plz
regards
carloz
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Last Edit: February 27, 2011, 11:05:30 PM by anwar
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Reply #1 on:
February 27, 2011, 09:16:12 PM »
carloz
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Re: Pro and Cons of overpowering
googling a bit more shows that using a 61 engine on a 46 model for 3d is common
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Reply #2 on:
February 27, 2011, 09:18:04 PM »
anwar
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Re: Pro and Cons of overpowering
I have a 55 2 stroke on a .46 size profile Yak 54. Overpowered, but not to the scale being discussed in these threads.
Remember that 4-stroke engines for equivalent 2 stroke ones are always higher displacement.
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Reply #3 on:
February 27, 2011, 10:06:55 PM »
Rajib
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Re: Pro and Cons of overpowering
Mr. Anwar may I know what size of propeller you are using for your Yak 54 with 55 2 stroke engine? I am asking you because I have same thing but because of my accident I didn't get chance to fly it yet. I think you're talking about the model which is on your profile picture, if yes then I also have same model with same engine setup.
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Reply #4 on:
February 27, 2011, 11:14:51 PM »
anwar
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Re: Pro and Cons of overpowering
12x3.75 currently. I can go a bit higher, but this seems to be more than enough for now.
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Reply #5 on:
February 28, 2011, 12:04:22 AM »
Rajib
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Re: Pro and Cons of overpowering
12x3.75 or
APC 12.25x3.75 Sport Propeller?
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Reply #6 on:
February 28, 2011, 12:05:52 AM »
anwar
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Re: Pro and Cons of overpowering
The APC one.
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Reply #7 on:
February 28, 2011, 12:11:26 AM »
flying doc
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Re: Pro and Cons of overpowering
It is 12.25 X 3.75. U can also use a 12 X 4 and u'll get the same performance.
I have a ASP 91 on a 60 size plane. Am flying it with an 14 X 6 prop, but will soon try and change it to a 15 X 4 and try some prop hangs.
Just saw a beautiful plane at Amby Valley with a set up most will frown upon.
A 46 size high wing trainer with a 91 4 stroke engine. It does a prop hang just after take off and maybe u could just take ur thumb off the throttle and it would hang on its own.
Doc
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Tiger Sports 40, SPA3D, SPAD Extra all with ASP 52 engines.
SPAD Debonair with OS 46
Turbo Raven 60 with an ASP 91
Next build - Accipiter 91 with DLE 20
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Reply #8 on:
February 28, 2011, 09:46:02 AM »
PankajC
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Re: Pro and Cons of overpowering
apart from increase in weight, wing loading and probably shift in CG, any other cons of overpowering?
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Reply #9 on:
February 28, 2011, 09:48:11 AM »
carloz
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Re: Pro and Cons of overpowering
another con i think would be to keep a firm hand on the throttle, improper or full thrttle would obviously result in losing the model..
regards
carloz
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Reply #10 on:
February 28, 2011, 05:21:05 PM »
flyingboxcar
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Re: Pro and Cons of overpowering
Yes the biggest con would be the increased probability of structural failure in case VNE for the aircraft is exceeded
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If you are really into scale you should be here.
www.rcscalebuilder.com
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Reply #11 on:
February 28, 2011, 05:23:11 PM »
anwar
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Re: Pro and Cons of overpowering
VNE ?
http://www.rcindia.org/rc-general-topics/rc-jargon-the-mega-list/
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Reply #12 on:
February 28, 2011, 06:06:57 PM »
carloz
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Re: Pro and Cons of overpowering
en.m.wikipedia.org/wiki/V_speeds?wasRedirected=true
heres a more detailed explanation
regards
carloz
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Reply #13 on:
February 28, 2011, 06:41:30 PM »
flyingboxcar
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Re: Pro and Cons of overpowering
In simple terms
VNE
=
V
elocity
N
ot to be
E
xceeded
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If you are really into scale you should be here.
www.rcscalebuilder.com
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