Low Wing

My Feedback: (1)

I have heard or read (can't remember) somewhere that you can put a fuel pump on your model...this sounds like a great way to avoid dead sticks...I was wondering if anybody(out there) was using them and can you explain them...I would like to put one on a 91 saito and a 100 satio...thanks...

Geistware

My Feedback: (16)

I have used a perry pump to feed fuel from a tank that was located at the CG. Once you get it adjusted it works great. Getting it adjusted is a real pain.

bob_nj

My Feedback: (62)

A regulated fuel supply is definitely the ticket in some situations. In others, it's just another glob of stuff to drive you crazy. The point is, if you don't need it leave it out for now. Your level of experience will be your guide. Below are a couple of links to the predominant suppliers of such devices. Some are pumps and some are regulators. The pumps "tend" to want/need a matching carb to handle the additional volume and or pressure.
In your case some of this doesn't apply as you have 4 strokes.
Let us know what you decide_bob

http://www.billsroom.com/pcfs/fuelsysdesc.htm

http://www.perrypumps.com/


http://www.reivers.myweb.nl/regulate...el_supply.html

Low Wing

My Feedback: (1)

bob_nj...thanks for the reply...but are there motor's that are already set up with an on board pump...would that be a better way to go...and do these pumps work better on 2-stroke's...I'm looking for a consistent fuel supply while flying extreme 3-d maneuver's...which doesn't seem to effect smaller 40 size model's like profile's and what not...But' on my scale 60-90 size 91-100 saito 4-stroke set up's, I have had some dead stick trouble right in the middle of lot's a fun...I'm asking you(and whoever out here who has had experience) cause it seems sometime's hobby store people are more inclined to sell as apposed to tell...which is understandable from a greedy perspective...

bob_nj

My Feedback: (62)

I got ya! The four strokes I've seen don't seem to need what you describe as much as the two strokes. The YS engines use a different principle for fuel regulation but it is a superb system. It's stock on all of their two and four strokes. They are a bit finnicky and on the heavy side but well worth the effort. I have a little experience wiht the OS stuff and it worked OK for me. Maybe we can start with your particular set up and go from there. What plane, weight, etc. are you currently flying?

fr8dog

I am curently using the OS91FS with the fuel pump on it in my TF Spitfire. The engine sits inverted so that is why I went with the pump. The pump comes set from the factory so don't touch the pump adjustment and you will be fine. When running the engine you only have to set the needle valve for max RPM and the pump does the rest of the work from there.

Low Wing

My Feedback: (1)

I'am currently flying a 60-size Super 90 Chipmunk with a 91 four stroke Saito...I also have the same model with a 100 saito...The model alone weighs 5.4 pounds. So if you add the weight of a 91 saito, 5- 605's and a re-track you have the weight...This model fly's very very well(great CG)...I have let other's much better than myself have the sticks and it is a favorite, that is capable of almost anything...But the reason I asked about a 2-stroke is because I bought a OS 91 fx 2-stroke and I'm putting it on a Extra 300 60-size...I'm hoping to pull the cork out on this set up(we'll see)...I don't know the weight of this model yet...

bob_nj

My Feedback: (62)

Your original question was about the Saito. Are you having trouble with any of those engines? Will the Extra have a side mounted or inverted engine? A pump shouldn't have much to do about dead sticks though_bob

Low Wing

My Feedback: (1)

ya' your right...I guess I was caught between a dilemma and a correction...living with the four-stroke factor for now and/or trying to eliminate the trouble with a whole new game...But, if your up for it, what about the 91 set up...the motor is side mounted...the 100 set up is inverted...all the other info is the same...

bob_nj

My Feedback: (62)

I'm going on the premise that you are looking for advice on a fuel pump for a four stroke. From what I remember, Perry/Varsane?Conley makes or used to anyway an oscillating (vibration driven) pump for the four stroke that supposedly worked well. Check the perrypumps link I posted and tool around until you find it. If you are experiencing dead sticks or flameouts, we may need to start at the beginning, fuel/prop/plug/tank etc. Let me know_bob

Low Wing

My Feedback: (1)

Thanks...I'll check out the perry site...