90 size engine in a 40 size airplane?  
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All Forums >> RC Airplanes >> Beginners >> 90 size engine in a 40 size airplane?
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90 size engine in a 40 size airplane? - 9/2/2008 7:08:51 PM   
jpinegar


 

Posts: 10
Joined: 9/2/2008
From: Wichita, KS, USA
Status: offline 		Hello,

I am considering putting a 90 size engine into a 40 size plane. I understand that I will have to counter balance the tail to ensure the weight and balance stays where it should but I am hoping for some advise. Has anyone done this before? Any thought and suggestions would greatly be appreciated. Thank you!!
       Post #: 1

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:20:41 PM   
mclina


 

Posts: 767
Joined: 12/27/2006
From: Westford, MA, USA
Status: offline 		Are you talking about a 90 four stroke or two stroke?

The other question that leaps to mind is, why?

More specifics on the plane/engine in question may help.

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(in reply to jpinegar)
       Post #: 2

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:22:36 PM   
cruzomatic


 

Posts: 1959
Joined: 1/28/2003
From: San Antonio, TX, USA
Status: offline 		Which plane are you talking about? Engine?

(in reply to mclina)
       Post #: 3

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:22:45 PM   
alex7403


 

Posts: 796
Joined: 6/29/2004
From: New york, NY, USA
Status: online 		I don’t want to terminate your happiness too soon,
You will be able to balance it and it probably will take off, I just wonder if the wing will stay attached….

Alex

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(in reply to jpinegar)
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RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:24:37 PM   
mclina


 

Posts: 767
Joined: 12/27/2006
From: Westford, MA, USA
Status: offline 		You will also need some very tall landing gear for prop clearance.

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If all of your friends were named Cliff, would you jump off them? - Hugh Neutron

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       Post #: 5

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:47:02 PM   
playntraffic


 

Posts: 124
Joined: 3/20/2006
From: Alabaster, AL, USA
Status: offline 		We run 75 and 90 sized engines on the Great Planes Easy Sport. You might need to run a higher pitch prop so that you get ground clearance. Tail draggers also work best because they point the nose in the air.

(in reply to mclina)
       Post #: 6

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:47:05 PM   
blvdbuzzard



Posts: 1528
Joined: 6/16/2002
From: boulevard, CA, USA
Status: offline 		What plane and engine is the question. The old Global .46 sized Ultimate flew very well on a .91 4s. Some 46 sized planes have Saito 82's, I am running a YS 63 in a 46 sized plane. I ran a Magnum .52 on the nose of a 40 Ugly Stick.

So, what plane and what engine?


Dru.

(in reply to mclina)
       Post #: 7

RE: 90 size engine in a 40 size airplane? - 9/2/2008 7:57:04 PM   
dignlivn


 

Posts: 657
Joined: 10/26/2005
From: Cullowhee, NC, USA
Status: offline

Hopefully your talking 90 size 4 stroke ?

I put a Saito 82 on a 40 size GP big stick
and I should have put in a larger fuel tank.
I ordered a 12 oz. to replace the 8 oz. tank.
It is slightly Nose heavy, I put 3 flights on her
just last week. Now I'm waiting for the bigger
tank. Good luck,


Bob

(in reply to jpinegar)
       Post #: 8

RE: 90 size engine in a 40 size airplane? - 9/2/2008 8:06:44 PM   
Mr67Stang



Posts: 2347
Joined: 4/26/2006
From: Raeford, NC, USA
Status: offline 		Cut at least 1 inch off the nose and move the firewall back. This will go a long ways towards helping you ballance the model. You may find that you will not like the results when you complete the project. Fact is you still have a 40 sized plane wing area and now you will increase the load on that wing which will deffinately effect the flight charactoristics. Some planes are more forgiving to the added weight than others. A Sig Kadet Sr. will accept a .90 a lot easier than a 40 size p-51 mustang for example.

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       Post #: 9

RE: 90 size engine in a 40 size airplane? - 9/2/2008 10:07:08 PM   
hungryandbroke


 

Posts: 322
Joined: 5/25/2007
From: blacksburg, SC, USA
Status: offline 		If you're gonna go that much larger than whats called for you might as well try this one.....

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXBY70&P=0



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       Post #: 10

RE: 90 size engine in a 40 size airplane? - 9/2/2008 11:44:28 PM   
alfredbmor



Posts: 1160
Joined: 6/1/2005
From: El Paso, TX, USA
Status: offline 		I lost my GP Cap 232, .40 size this weekend because of a death stick. It solely does not mean much, what really means is the fact that I was using a Saito 1.00 in a .40 size plane. I had to put the nose down but the plane was pretty far from the runaway and in its last turn it stalled and was the end of it. This cap was a great performer but with the engine off it was a great brick. To conclude, yes I would put a .90 size engine in a .40 size plane but I would be more cautious checking the wing loading.
Good luck!!
Alfredo.


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       Post #: 11

RE: 90 size engine in a 40 size airplane? - 9/3/2008 1:09:59 AM   
OzMo



Posts: 1500
Joined: 9/2/2002
From: OZark, MO, USA
Status: offline
quote:

ORIGINAL: hungryandbroke

If you're gonna go that much larger than whats called for you might as well try this one.....

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXBY70&P=0





I'll put it on my LT 40 if you send it to me

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       Post #: 12

RE: 90 size engine in a 40 size airplane? - 9/3/2008 3:37:42 AM   
Jester241



Posts: 459
Joined: 8/25/2007
From: , PA, USA
Status: offline 		My buddy has a Funtana .40 with an O.S. 91FX in it and it flies perfect. You'd never know it had a big motor in it. Of course it has unlimited vertical and stuff,but its also tame as my cat who is sitting right here on the arm of my chair as I type this. I say go for it! I'd recommend putting a lower pitch prop on as to increase thrust and decrease speed. It'll also let your plane slow more for landing which is a common problem with overpowered engines. And like the others said,watch your props ground clearence. Just dont fly it like its a racer,but rather more for 3D purposes and you'll likely find it'll be a good match. Just dont stress the airframe too much at high speeds. OH,and beef up the firewall and stuff too,and you'll likely have to shift some battery weight and stuff further back to balance.


Speaking of this topic,a club member at our field also had a .40 sized U-Can-do 3D plane with a .91 in also and it too flew great!






< Message edited by Jester241 -- 9/3/2008 3:39:16 AM >

(in reply to jpinegar)
       Post #: 13

RE: 90 size engine in a 40 size airplane? - 9/3/2008 3:58:08 AM   
jpinegar


 

Posts: 10
Joined: 9/2/2008
From: Wichita, KS, USA
Status: offline 		Thank you all for your advise. I was thinking about a 90 size two stroke in the somethin' extra - or simular airplane....I appreciate your help!!!

(in reply to jpinegar)
       Post #: 14

RE: 90 size engine in a 40 size airplane? - 9/3/2008 6:19:16 AM   
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