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ultimate bipe engine question

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Old 09-25-2008 | 10:26 AM
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Default ultimate bipe engine question

i am building and rebuilding a dave patrick ultimate arf, the fellow at the hobby shop talked me out of an inverted mount so i mounted sideways. Now my fuel tank centerline is an inch below my centerline on the carb of my saito 56. Will this run into problems with rich/lean runs?? He wanted me to carve out the cross bracing ply and raise the tank, but the struts for mounting the wing are there so it doesnt look like a good idea. Any words of wisdom would be greatly appreciated!
Thanks, George
Old 09-25-2008 | 10:46 AM
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Default RE: ultimate bipe engine question

....it won't make any difference as long as you have the stock muffler pressure to the tank.

FBD.
Old 09-25-2008 | 11:17 AM
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Default RE: ultimate bipe engine question

You could use the uniflow tank setup, that should help.
Old 09-25-2008 | 01:31 PM
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Default RE: ultimate bipe engine question

Hi pardon my ignorance, but I am just getting into 4 strokes and I dont know what a uniflo tank set up is love to be up to speed thanks Bob A
Old 09-25-2008 | 01:51 PM
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Default RE: ultimate bipe engine question

Check the following site:
[link]http://www.fraserker.com/heli/uniflow/how_uniflow_works.htm[/link]
Old 09-25-2008 | 06:27 PM
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Default RE: ultimate bipe engine question

Thanks guy's, the uniflow looks like the thing. I was considering the header tank earlier, but did not know what it was called. Now that i read the uniflow article, i like it!
Thanks again, George
Old 09-25-2008 | 07:39 PM
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Default RE: ultimate bipe engine question

Hello; The only "Dave Patrick" ultimate I've ever seen had an OS 120 in it, the owner said it didn't have enough power and was going toput a TS 155 in it to power it properly. I don't think that your OS 56 will have much of a chance even though we all know what wonderful engines they are.
Old 09-25-2008 | 11:49 PM
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Default RE: ultimate bipe engine question

I assumed he had a 40 sized version?
Old 09-26-2008 | 06:19 AM
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Default RE: ultimate bipe engine question

Oh; ( drr slap my forehead) i forgot to list that it is a 40 size. Ha. I have had so many problems putting this thing together, i am wishing i had not bought it. Not to mention the hobby shop neglected to tell me patrick is out of business, and i have no support or warranty on a new ARF !
Anyway, I bought another plane that they had and am trying to find info on that too, please see ( powerline hobbies edge 540 vs ST 3250) , could use some help there too.
Thanks to all, George

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