OS40FP/twist
 

How 'good' is a OS40FP compared to other .40's that are on the market now? I have a 40FP in my PT40, and it seems fairly stout in that plane..I typically fly with it less than 1/2 throttle (never have to nail it unless i get in trouble showin my butt hehe)

I picked up a Hanger 9 twist 3d at my LHS, they were on sale and i heard they were a great fun fly model, and was thinking about putting that 40FP in it..or should I get something else? I am not interested in "3D", per se, just in minor acrobatic stuff :D no hovering or trick stuff like that..if not that 40FP, what would be best (2 stroke, semi-affordable)?

RE: OS40FP/twist
 

The 40FP will do what you want with the twist. I'm sure you have probably found that our by now. Since you don't want to do 3D and simple aerobatics, the 40 would be ok. Probably not too much vertical pull though.

RE: OS40FP/twist
 

Should be adequate. Don't forget, the FP is a fairly light engine, a performance advantage in itself........just built so you don't have to add weight to balance the plane when you're done.

RE: OS40FP/twist
 

The Twist I built for a kit review and several other I have heard of came out tail heavy with a .46 engine, so yours will definitely be tail heavy. You will have low power to start with so you don't want to further reduce your performance by having to add a lot of weight.

I would use mini metal gear servos in the rear, something about 1 ounce, not the micros. I would put the bettery under the tank, if possible. I might look at moving the rudder servo forward and using pull-pull instead of the rear mount. Use the lightest servo arms and cut off any extra arms not used.

Mount your engine as far forward as you can get it. Use a plastic prop, APC or MA, not a light wood one. Get one of the brass heavy hubs. A .40FP is a good engine. It just doesn't have the power of a ball bearing .46 so you need to keep the weight way down to maximize your power-to-weight ratio.

RE: OS40FP/twist
 

I have an Evo .46 on my Twist. About the same weight as an OS .46 AX. It is mounted all the way forward on the mount. I still had to add about 4 oz or so underneath the fuel tank. The Twist builds tail heavy. A nice thing though is they give you about an inch in the CG area to play with. If you wanna do 3D with the plane, make it tail heavy.

dave...

RE: OS40FP/twist
 

Thanks for the replies. I have'nt got to try it out yet (bad weather, work) but I hope I can get her out today for a maiden.

I mounted the 40FP as far forward as I could, used the heaviest spinner I had, mounted the reciever and battery pack as far forward as I could, but it is still ever so slightly tail heavy, but it is within range of the CG in the book. I'll stick a little weight under the fuel tank to rectify that before I fly.

Hopefully today I can get free long enough to go fly...:eek:

RE: OS40FP/twist
 

well...it don't have enough power to get me out of a bind. Proof was the ditch digger dive from about 40 feet [&o] i almost got it "back", ended up landing flat VERY hard, bent the snot out of the landing gear and broke the fuse behind the wing (fixable).

Taught me REAL quick that I was'nt ready for that kind of plane. I'm going back to trainerville for another few months ;)

RE: OS40FP/twist
 

Sorry to here that man. I would say brush up on the trainer and get some help for the re-maiden of the twist.

RE: OS40FP/twist
 

Same thing happened to me. I thouht I was ready and moved on to my first low wing plane too soon. It lasted a few weeks and I trashed in. Then I had to return to my trainer while I built another kit. I flew the wings off of it. When I moved on to another plane, I had a lot more confidence bc of all the flying I had the 2nd time around with my trainer.

RE: OS40FP/twist
 

If you still have the need and the FP.40, try it on a Magic. I did one with that engine, a Macs pipe, and mini servos. Whole thing weighed less than 3.5 pounds. On an 11X4 prop, it had unlimited vertical, and on low rates was so slow and forgiving a kid could fly it. If you have a computer radio, you can kick the rates way up and add plenty of expo and have a ball. It won't knife edge, but it can make you look really good, really quick with a little practice. It is also much more rugged than the twist. I've had three magics, but only one twist. Wanna guess why? Too bad the OS LA's didn't come out as good and light at the FP's. For a bushing engine, they make good power, are extremely light and are very reliable, unlike the LA. Good luck in your search for the second plane.