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BobCat downthrust? - 10/22/2005 3:58 AM   
Haldor


 

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From: Algard, NORWAY
Status: offline 		Hi guys.

I'm doing some preliminary CAD work for a DIY "BobCat" and was wondering if the BVM BobCat have the turbine dialed in with some downthrust? I would assume there is but how much?

Also whats the wheelsize used on this jet, for gras ops? From the 3views the mains seem to be ~60mm.

Any help would be appreciated.
Haldor
www.halair.com

< Message edited by Haldor -- 10/22/2005 4:28 AM >

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RE: BobCat downthrust? - 10/22/2005 5:57 PM   
Silver182



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quote:

ORIGINAL: Haldor

Hi guys.

I'm doing some preliminary CAD work for a DIY "BobCat" and was wondering if the BVM BobCat have the turbine dialed in with some downthrust? I would assume there is but how much?

Also whats the wheelsize used on this jet, for gras ops? From the 3views the mains seem to be ~60mm.

Any help would be appreciated.
Haldor
www.halair.com


I suggest you write Bob and ask him, your doing electric versions of different aircraft so it's possible he will give you all the data & info you want.

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RE: BobCat downthrust? - 10/22/2005 9:54 PM   
AVIOJET



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Status: offline 		Haldor, the BobCat has about 4 degrees downthrust and 2 positive degrees on the stab.

BR

Jesus


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RE: BobCat downthrust? - 10/23/2005 12:13 AM   
Haldor


 

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From: Algard, NORWAY
Status: offline 		Gracias Jesus

So the stab is set to +2deg relative to the wing? Would account for some of the high pressure area (exhaust) under the stab.

Info much appreciated!
Haldor


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RE: BobCat downthrust? - 10/23/2005 2:16 AM   
AVIOJET



Posts: 209
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From: ZARAGOZA, SPAIN
Status: offline 		Haldor, all the angles are refered to the wing airfoil axis. To be honest I never understood wery well this set up, but my BobCat with a P-120 doesn't experiment any changes in fly at full or at idle.
Sorry I can't help more in this question I am not expert in aerodynamics.

BR

Jesus


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RE: BobCat downthrust? - 10/23/2005 3:05 AM   
Haldor


 

Posts: 92
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From: Algard, NORWAY
Status: offline 		Your info is plenty so no worries. Getting everything in the ballpark is the best I can hope for

Cheers,
Haldor

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RE: BobCat downthrust? - 10/25/2005 8:13 PM   
Haldor


 

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From: Algard, NORWAY
Status: offline 		BTW what is the aluminum tube diameter/thickness? The ones that support the wing.

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RE: BobCat downthrust? - 10/25/2005 8:59 PM   
AVIOJET



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From: ZARAGOZA, SPAIN
Status: offline 		Harald, the front tube is 7/8" and the rear 3/8". I don't know the thickness because my BobCat is scratch built from plans and I have fitted 22 mm. and 16 mm. with 1.5 mm w.t. I guess that the english size is about 1 mm. w.t.

BR

Jesus


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RE: BobCat downthrust? - 10/26/2005 1:50 PM   
Haldor


 

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From: Algard, NORWAY
Status: offline 		Excellent, thank you!

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