Ok I need help with an engine for a GP Venus. I originally planed to use a .52 2stroke but after it was defective out of the box and I sent it back and it came back saying "Don't run your engine in dusty areas, the crankshaft was nicked" even tho the engine was simply removed from the box and then repackaged for warranty work. Then when I got it back even after a gallon I never could get a reliable idle (it siphoned a little - so I installed a pump just in case) and it still was way too wavy at the low end and I tested for air leaks...

So - what engine combo did you use in your Venus that didn't require a regulator to keep it from siphoning while being inverted. The tank is quite high in relation to the engine. Looking for a .46-.52 2stroke or a .70-.72 4stroke and wanted opinons on what worked well stock with the stock fuel location.

The OS 46 FX is a very good engine...Iv'e had no problem's , with the 5 I have...just my 2 cent's ...JW

My OS 50 SX siphoned a little till it got broke in and leaned out. Now I just make sure I fuel it up with the carb closed off and no more problems. You should like the way it flies when you get it done.


Ed M.

Ever considered a Y.S. FZ63... I try to sell them to everyone... great engine with lbs of thrust!!!

I put a YS 63 in my Venus, moved the tank back behind F2, under the forward part of the canopy--although it could just as well have been in the "tank compartment" as far as fuel delivery goes. Engine mounted inverted, unlimited vertical, no siphoning, nothing but great flying on 20% nitro.

My Venus has an OS 50 SX. I love it.

I installed an Irvine 53 and have only broke the engine in. There was some fuel leakage, but not bad. You would just have to follow preventative procedures....throttle closed while fueling until ready to fire, etc.

Have a SuperTigre Bluehead 60 in mine. Plenty of room under the cowl for larger
engines and the Venus needs something larger than a 40. The only problem
with the Venus is locating the centerline of the tank with the carb centerline on
the inverted engine. Did a little surgery on mine and put a Tettra 12 oz in it. The
Tettra tank has a fairly small circumference for a 12 oz tank, just a little longer
than the tank that came with the airplane, so a fairly easy modification. Only took
8 grams of weight on the tailwheel mount to balance with the 60.
If you locate the tank where the hole is already in the firewall the carb will be well
below the tank and fuel will siphon into the engine while just sitting. Not good with
an inverted engine. Hydro lock!!

tommy s

I am considering a Saito 72 for my Venus, any comments on this combo.

OS 50SX is the perfect combination for my Venus.
I have fibreglass the servo tray and the wing joint for the venus, it's a minute work and it gives me peace of mind.
i also changed the main wheels to 1/4 " bigger, forget about the wheel pants as i am flying in dirt runway.
enjoy, it's a great plane.

I ordered a 50sx and another cowl. I had already put in the other engine when I found out it was terrible inverted (it's almost as if the low and high speed neelde go from too lean to too rich by just breathing on them - even with a fuel regulator).

Yeah I skipped the wheel pants cause I fly off grass - even tho I run pants on my 60 size with no problems - we pay a pro to cut the grass at least once a week,sometimes more.

My wheel pants were the worst looking wheel pants. Down the middle at the seam I had a good 1/8" where it looked like they used a glue that melted the fiberglass. There was a serious indentation and no paint all the way down the seam on both of them. Major ugly.

Common Problem easily fixed!
Problem 1: The outlet line of your fuel tank is positioned significantly below the middle of the tank. That devil gravity is pulling everything towards the center of the earth, including your fuel tank contents. If the contents can just find a way out of the tank i.e. the outlet line of your tank, that gravity will empty your for you. Bad Gravity!
Solution: Have you ever seen gravity cause a fluid to run uphill? I did once, But decided to quit smoking that stuff! No fluids will not run uphill from gravity. So here's the trick: On the engine side of the tank, Loop the fuel outlet line up above the tank centerline and back down to the fuel inlet fitting on the carb, Then snub nose at Gravity!
Problem 2: The Vacuum inlet for your engine is pointed towards the place(the earth's surface) that the earth keeps it's dirt and other stuff we don't want on the inside of our engines.
Solutionetermine whether you are cheap or not.
If Cheap: While wife is talking on the phone to to her mother about how cheap you are, sneak into bedroom, find some nylons of hers, and remove a section of nylon about the size of a half dollar. When you put the nylons back in the drawer, fray the edges and make it look as though she tore them on something! Take the piece of nylon and drape it over the carb. air inlet and wrap the rest of the material around the outside of the air inlet. Then secure the nylon by wrapping a rubberband around the outside base of the carb thoat so as to secure the nylon gatherd there.
If not Cheap: Buy an airfilter at the Hobby Shop.
I used a YS 45 RE on my Venus. Very Enjoyable set up! Bryce