Razor-RCU

My Feedback: (50)

JFC- Mark 5, I am not talking HP I am talking RPM and weight- geesh! The YS has a lot of oomph, but on a 6 lb plane how big of a disc are you oing to swing?

A Jett-1.20 has more power than the YS-60 but that does not equate to SPEED. Do you think I am an idiot? I have been doing this for 20+ years...

As an aside, the wheels down will make the airplane SLOWER not faster....

bob27s

My Feedback: (19)

Razor is not all that far off base... but making a statement like that either way would require some qualification.

The SJ50 and SJ60L are quite powerful. The SJ-60LX even more so.
Replace the standard jett-stream muffler with a full size pipe, and there is more to be had.

(In fact, the SJ-60L and SJ-60LX have gained some favor with the SPA and BPA pattern organizations - replacing in some aircraft what were in the historical aircraft OS-FSR, Rossi, Webra and YS .61 engines. )

The engines are designed for different applications, and different RPM ranges.

If you went just by HP numbers calculated on a calibrated dyno, the SJ50 and YS60 engines might look pretty much equal.
But when you look at the rpm curve and where the HP is developed at, you see the divergence in application.

For speed, a smaller diameter prop is prefered, spinning at higher rpm (generalized). The SJ50 or SJ60 engines are better suited for that than the YS60 is. Keeping that prop disk area to a mimimum is a significant drag-reduction.

Mark 5

bob 27s, I have to agree with you,a small light 40 size patriot with a jett 60LX is probably the ideal combo.and this is what I would have used if I did not have my YS60.The preformance of my patriot with this engine is very good for a prop. powered airplane.I am getting similar speed spinning a 12 pitch prop. at 13,000 as my friend would in his patriot spinning an 8 pitch prop. at 18,000.I guess that prop. selection is just as important as the engine and airplane.You probably know more about this than all of us.Back to work on my next speed plane,it will be much faster than my patriot.

funflyerf4

My Feedback: (6)

Hey Mark your days are numbered buddy,The new Patroit on the field is just about done.Can you say 200+ all right just wishing.

Mark 5

Hello Frank, your patriot should be very fast,it should be faster than mine.[&o]Ihope you dont rip the covering off with those high speed low inverted passes of yours.

Mark 5

Hello Frank, what's the storys. Is the race still on.

sarpet

PATRIOT XL
engine webra .90P5 apc 12x12 11500rpm 80/20 fuel

SpeedBoy

Beautiful Patriot

I love the pics [8D]

bob27s

My Feedback: (19)

Nice.....

That bird should fly quite nicely

Razor-RCU

My Feedback: (50)

Good looking Finnish speedster there! Let us know how it goes...

CARS II

My Feedback: (7)

Since you guys are talking about all kinds of Patriots here, here I come with mine, xl 60/90 size still in the building process, it has been a few years since I build a balsa kit and had forgotten how much fun this building bussiness is , I'm also building another airplane all wood too at the same time but the Patriot has priority, it will fly in about a month ( I hope )

I got me two sets of laser cut servo covers ( actually the servos get screwed to them ) from Laser Design Services to change the position the servos are mounted in the wings, I had to build a new NG mount to fit my 20+ old spring air retracts using a pull/pull system, will be using a 16 oz fuel tank ( I happen to have that size at home ) and will like to mount it right over the CG, I saw on the last AMA magazing a new fuel pump that will allow me to instal the fuel tank any were I want ( sweet ) will sheet the wings 100%, and have a pair of BVM wheels with brakes that I pick up at a swapmeet some time ago, since I will be using air for the retracts then I could use it for the brakes also [8D] I will be using a ST 90 on the nose, about which prop to use first not sure at the moment it all depends on the final dry weight but to start I guest I can use a 12/8 and 11/8 I'm also getting one of those black Mcpipes.

what you guys think????

sarpet

i try st .90 and it not like run over 13000rpm
http://lennokit.net/showthread.php?t...ht=super+tigre

SpeedBoy

This is a video of a Patriot XL with a ST .90 and 13x8 APC (with pipe ) .This probably can give you an idea how will fly with it .

http://www.youtube.com/watch?v=LVRkD...eature=related

sarpet

hello guys
ihave problems with engine fuel supply.
my tank is on balance point and iuse webra tank pressuring system and it not WORK.
where is yours fueltank and if its on front fuselage,how 400gr nose weight effect?
3flights today and 2 deadstick.

vasek

My Feedback: (4)

If you're using only pipe pressure it might not be enough. Not sure if the device seen in your pic is a pump driven by pipe pressure. (?)

In any case you could try a "header tank" or "hopper tank". There's no need for pumps. Do a search here on RCU & you will find the info needed.

sarpet

it is webra kraftstoff-druckregler
fuel pressure regulator,fuel tank is pressurised and it is silencer pressure which controls the fuel regulation process. but it not work.
ihave to try hopper tank.

labebe

Hi i put an os 91 fx on my new patriot xl. os manual said that a prop 15x8 works fine. But those 15 in prop hit the groun, what can I do?? what prop size do you recommend for me??
thanks,
Alex

budleeman

My Feedback: (14)

Lets see a pic. I am going to start with an 11-6 or 11-8 with 20% fuel to get the RPM up.