Nitromarc3

My Feedback: (30)

Hello I just picked up a great planes PT-17 stearman arf today, and need help on a engine choice? thinking of os 1.60 size engine, or the evolution 1.6 gas engine, or magnum 120 4 cycle, or the OS 120, what engine to use or should I use something else.
Thanks for your help.
nitromarc3

dan4466

My Feedback: (68)

I would probably use a 1.20 FS. I looked at the manual online and with the dummy radial and the engine inverted, it will look pretty good. It does in the manual. I see they do list a .91 FS on the low end, but they list 14-15lbs for weight, which means more like 17lbs. I think your choice of a 1.20FS would be a good one. The 1.60 your talking about; do you mean 1.60 twin? If so, that would sound awesome I bet on that plane. If its the 2-stroke, I have one with a pitts on it and it sounds real cool, but not sure how it would look on it. Please post some pics when your done if you can. I really like this plane and would love to get one myself. Good luck!

ckangaroo70

My Feedback: (51)

I have been looking at this Plane, and I to was thinking 1.20 Magnum or 1.00 or 1.20 Saito. Very neat looking Plane!

Jimmy Bananas

My Feedback: (13)

Got mine yesterday...planning on a Mag 120 4-stroke for it...going to check it out to see if there is enough room for a G-23...in the instruction book,they said that they flew their's with an OS 91 4-stroke..needed 18 ozs of lead up front...hard to believe that it flew with a OS 91 4-stroke..Target weight is 14-15 Ibs.........more later

carlbecker

My Feedback: (3)

I have one on order and will put a Saito 120 GK in it. If you can ligthen the tail and use less lead (18 ounces using the OS 91 4S) then it will fly better. The Saito is 6 oz heavier. If I use a 5 cell battery pack and place it where the lead box is and use pull pull for the rudder and one carbon tube for the elevator I think I will not need much lead. I also plan to move the servos forward. We shall see. The GP Ryan flys great on a Laser 120 which is a little more powerful than a Saito 100 but heavier. The Saito 100 would require more lead for balance as its very light. I think a 120 4s would be perfect.

Carl

Meesh

My Feedback: (135)

A friend of mine has the GP Super Stearman (same plane,different colors). Flies with authority with a Magnum 120 4-stroke even with a smoke system.

Bob

Jacque

My Feedback: (22)

I have great planes super stearman,with G 26 ,perfect match. G 23 will also be good . and a lot less fuel cost. Jacque

Hellcat716

My Feedback: (2)

How difficult is it to remove the wings for transport? How long does it take to remove the wings? I love the looks of this plane but do not want to have to spend an hour or so to put it together each time to fly. Thanks.

chasrb

I have been looking at this plane as well as you guys, it's not a bad looking arf. I have been thinking of using the TechnoPower http://www.technopower.com/ 7 cyl 2.0 ci and only 30.5 oz! or the saito 325 5 cyl 3.25 ci and 84 oz. rather than faking it with a dummy radial.

I don't know if the firewall on this pt-17 could deal with the stress of a multi-cyl engine. I can make mods if needed, but that only keeps me in the workshop and not flying...

carlbecker

My Feedback: (3)

Chasman,
The Saito 325 is way to much motor for the GP Stearman. The Technopower would probably be fine as they don't appear that powerful. The sound would be fabulous though.

Carl

chasrb

Carl, my thoughts as well, unfortunatly the TechoPower 7 will be at least 6-8 months out. They are a two man shop doing an upgeade to the architecture of the engine. The old engineering left something to be desired.

The GP PT-17 is a stepping stone to the Flair 1/4 scale Stearman, what a great looking plane...might have to do the RCS 215 on it, but then it may be too much for it too. The Robart 780 has been used, but at 4K, it is a little steep.

BTW where do you fly? The FARM ot NVRC...

chasrb

Well I am heading to the hobby shop to pick up my GP PT-17 today. I have a Saito 120 that has been new on the shelf for a few years and now looks to have found a home. I will use this plane to get use to the characteristics of this PT-17 and at the same time building my 1/4 scale Flair PT-17 that will have a radial on it once I get a firm handle on where to buy a Seidel 7 cyl.

Jimmy Bananas

My Feedback: (13)

Hellcat:

I leave the "N" struts attached to the top wing... be very careful when you transport it this way.......their are only 8 screws that you need to get it all together at the field..Also made the transport handle that fits to the cabane on the fuse...Very handy..no problems so far...Am using a Magnum 120 4 stroke in mine and it's scale speed and it does the job..A 150 4 stroke would also be OK,if you want a little more zip to your flights...The plane rolls very good and I dive it a little to get those "Big " Loops...The plane is a joy to fly and land.............One more thing..Attach the eleavtors with a piece of 1/8" wire, and that way,you only need one wire pushrod to operate the eleavtor..I didn't do this and ended up using a HS-945mg servo for the eleavtor..Too much of a bind somewhere..was always buzzing (servo)...I also used Robarts large horny point hinges...Good luck

P-51B

My Feedback: (5)

Do have any photos of the installation? I was thinking about one of the MVVS/Evolution engines that H-9 will be carrying.

I have an RCV 1.20 I could use, but I am wondering about cooling while still maintaining a reasonably semi-scale appearance on the nose.

chasrb

Are you going for the twin MVVS?

chasrb

Hey P51-b sis you got pick up a PT-17 yet? I have the wings and servos done so far.

P-51B

My Feedback: (5)

Yeah, Chas, I picked up one on Saturday, but I didn't get as good a deal as you did on yours. [:@] Now I know who to deal with.

I was thinking of the small MVVS (1.6 I think). I have the RCV we talked about, but I am unsure about cooling it, and I have had at least 1 person tell me their is not a enough prop clearance for the prop the RCV would need. I haven't measured it yet though.

Does MVVS make a small twin that may fit?

chasrb

I went to look them but it is a 2.1 I believe. You know a small Laser 160 v-twin could work. If I didn't already have the Saito 120 I'd be looking there.

Did you order from Ko or did they just reodered after I took the last one?

P-51B

My Feedback: (5)

They re-ordered to replace yours. I went in to get the H-9 extra 260 (which I got) on on Friday (got a good deal on that from the same gentleman you dealt with on your stearman). They had the stearman there also. I went home and debated spending that much money at once, and decided to suck it up and get it so we could do that formation flying you mentioned! (yep, it's your fault, you can explain it to my wife )

chasrb

I take full responsibility! So you got the big one eh? Both boxes of it?

P-51B

My Feedback: (5)

No, I didn't get the GP Cap 580, I got the new 50cc H-9 Extra 260...and the Stearman. I may get the 580 down the road, but I am not ready for it yet.

chasrb

Okay, well I'm not taking the blame then for the 260...

chasrb

I went to the HH and picked up the GP Mag building board so I can be sure the Flair 1/4 will be as true as I can get it. I have crushed a few ribs and LE/TE in my building...

P-51B

My Feedback: (5)

That's fine, but I am blaming you for the Stearman.

P-51B

My Feedback: (5)

So, since you have been working on yours, what is your opinion on the RCV and cooling issues?