what size 4 stroke in a Global Fokker D-7?
06-15-2007, 11:38 AM
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what size 4 stroke in a Global Fokker D-7?
Hey Guys, I've got a Global Fokker D-7 still in the box and I wanted to put a bigger 4 stroke in then the Magnum 52 that they suggest. Does any one know what bigger 4 stroke would fit without having to cut up the cowling? I was thinking about some thing around a 70 would be better.
I've got a Magnum .61 that I was going to put in but decided not to since it's not a very powerful engine and I want power to spare.
I've got a Magnum .61 that I was going to put in but decided not to since it's not a very powerful engine and I want power to spare.
06-18-2007, 12:15 PM
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RE: what size 4 stroke in a Global Fokker D-7?
Hey Guys, I want to make sure that either the OS 70 or Saito 72 will fit under the cowling with out cutting big holes in it? Just making sure since I can't find to much on engine dimensions to compare.
06-18-2007, 01:44 PM
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RE: what size 4 stroke in a Global Fokker D-7?
You can download the Saito 72 manual from:
http://www.horizonhobby.com/Products...ProdID=SAIE072
The OS 52 and 70 manuals are available from:
http://www.osengines.com/manuals/index.html
The manuals have pretty detailed dimensions. I've never compared a 52 to a 70 or 72. Comparing an OS 70 to an OS 91, the dimensions appear to be similar, but when you hold the actual engines side by side there is a significant difference that can really impact cowled installations.
If you have a local hobby shop, carry your cowl with you and "test fit" engines to it.
http://www.horizonhobby.com/Products...ProdID=SAIE072
The OS 52 and 70 manuals are available from:
http://www.osengines.com/manuals/index.html
The manuals have pretty detailed dimensions. I've never compared a 52 to a 70 or 72. Comparing an OS 70 to an OS 91, the dimensions appear to be similar, but when you hold the actual engines side by side there is a significant difference that can really impact cowled installations.
If you have a local hobby shop, carry your cowl with you and "test fit" engines to it.
07-11-2007, 09:06 AM
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RE: what size 4 stroke in a Global Fokker D-7?
carrellh, thanks for the help and yes I did print those manuals out....cool stuff for sure! One thing I did find interesting is that Magnum couldn't give me any dimensions but every one else could.
07-11-2007, 12:43 PM
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RE: what size 4 stroke in a Global Fokker D-7?
The Magnum 70 is very very close to the OS 70.
The 70 engines are quite a bit bigger than the 61 that you already have.
How much spare room does it have with the 61 ?
I have one of the Magnum 61's and it will spin a 12x6 Master Airscrew scimitar @ 10k using 15% nitro.
I think the static thrust was just over 5 lbs measured with the fish scale.
The 70 engines are quite a bit bigger than the 61 that you already have.
How much spare room does it have with the 61 ?
I have one of the Magnum 61's and it will spin a 12x6 Master Airscrew scimitar @ 10k using 15% nitro.
I think the static thrust was just over 5 lbs measured with the fish scale.
