RC-CAKES

My Feedback: (4)

I'd say go with the YS110. Lots of power, appropriate weight, and able to take the Keleo. Move as much as you can aft and just add some lead to the extreme tail end. I used the round opening to fit inside and glue the lead sitting on the stringers on each side within. They have been in there for 1.5 years.. no prob.

I am using SA-125/keleo/Robart struts,retracts,tires. I can't fly it enough.

thebluemax

My Feedback: (151)

I agree withgoing with the YS-110. However, the Keleo exhaust willnot fit on the 110 because of the chanberboxon the top. The bolt that goes throughthe Keleo mufflerwill thread into the head as it is the same size as the 120 and up, but that box gets in the way and it just don't fit. I have a Performace Specialities muffler andtwister adapter I think I can keep it all in the cowl except for thepipe at the bottom.

jamesc43

My Feedback: (2)

Gentlemen and Ladies,

I have a line on a NIB Top Flite P-51. I think it is a pretty good deal price wise. I've been thinking about several engine options. I would
like your opinions with the pros and cons for each relative to engine set up and weight and balance issues. I am a pretty good engine tuner
so that doesn't matter.

OS FS-91
OS 91 FX
Thunder Tiger 91 (4 stroke)
YS 91 AC (supercharged 4 stroke)
YS 91 FZ (supercharged 4 stroke)

The YS 91 AC was orignially in a World Models P-51. It really hauled the mail but I did have to add quite a bit of lead to the tail to ge the CG right. I just swapped the 91 FZ out of a 4 Star 60 because the intake gasket was leaking. I installed the 91 AC in it's place for now until I get all the issues worked out.

JeffH

My Feedback: (43)

I have a YS-120 in mine and it did not require any lead in the tail to balance. I have the Rx and the A123 flight pack mounted where they say put it. The only change I made was to move the tank back closer to the CG. Doing that moved the airtank back some as well.
Don't assume that you will be nose heavy or tail heavy, check things out first.

thebluemax

My Feedback: (151)

Your right. Should wait and see. Good deal that you did not need any additional weight!!!! Did you use the Keleo exhaust or the one that came with the engine? thanks....



I'm thinking about adding a 602P nose gear unit as a tailwheel retract. The 602P is an air-up/spring downpneumatic and would be able to connect up to the Spring Airs Iplan to put in. It weighs about 2 oz which could help with balancing.

JayBird26

Memorial Day Fly By at the club.

thebluemax

My Feedback: (151)

Very nice. Looks like you had a real good day. Hopefully the other guys there were drooling all day over your Mustang.

Flight 21

PHague- You were probably referring to the 90-SP, but in case you are interested here are some pics of my install of an RCV91-CD. I love these engines and due to the engine design it fits very nicely in the cowl due to its short profile. Sounds fantastic too - very realistic. I used a DuBro soft mount and also had to add ply mounts to extend it a bit. The only other mod was slightly repositioning the throttle pushrod. Very easy and nice fitting engine in this airframe.

thebluemax

My Feedback: (151)

I started working on mine today as I now have all the parts I need to do this. I decided I wouldstart first with adding the retractabletail wheel. Since this is amod with a little bit of workI thought I would get it out of the way. Plus this is the first time I am doinga retractable tail wheel so I wanted to not have to do it in the middle ofputting this together.

I got the Robart 602P pneumatic nose wheel retract and put it in so it retracts towards the nose of the plane. I also picked upa Dubro 1/4 scale tail wheel bracket. It has a 1/8th inch wire that fits perfectly into the retract. I did have to bend it to get the angleto match the one that came with the plane. It alsohad to be bent as it would hit the cylinder when it was retracted.I had mixed up too much epoxy when I was putting in the plywood support plate, soI used the excess to glue the three wing joiners together.

Here are pictures of the tailwheel in place. the black is carbon fiber strips for additional support.

thebluemax

My Feedback: (151)

While I was waiting for the epoxy to dry I did this to the scoop. I just cut out a piece of black screen and glued it in with a glue stick. Seems to be holding pretty good but I am not sure how well it will hold up. I figured using someother glue such as epoxy or canopy glue might not come out so good by clogging the holes in the screen and ruinthe look.

Kenpilot

I am using an O.S. 110FSa pumped on my TF .60 P-51 ARF. Anyone familiar with a vibration isolating engine mount that would work on this aircraft?

Also, just completed retrofit of CJ retracts, have not flown with them yet. Flying off grass, so not sure if the Robart scale 3 1/4's will be a good choice. Previously used DuBro smooth wheels on the stock mechanicals. They held up surprisingly well through my dysfunctional landing attempts, most of which ended in a nose over. C.G is set at book value, two ounces of lead in tail, receiver battery in the elev/rudder/throttle servo area (1500mah). Onboard glow system using a A123 pack back there as well. Flies very well during 99 percent of the flight regime. Just that last 5 seconds that does not go well...gotta work on that.

Thanks to all who contribute to this thread. Have read it ALL, very comprehensive.

skillet92

Kenpilot Not that i am saying anything is wrong because every install and engine is different, but I have that same engine in mine and it is smmmooooottthhh. Probably one of the smoothest engines that I have! What problems are you having?

Lifer

My Feedback: (1)

thebluemax,

I used canopy glue to adhere screens like that and it dries clear and holds well. I don't know if a glue stick will stand up to the heat of summertime flying.

thebluemax

My Feedback: (151)

Lifer,
I agreeI don't think it will hold either.IthoughtI wouldgive it a shot. I will pull it off and themuse the canopy glue.I know that will hold. thanks....

PHague80

How much weight to add to the tail to bring it into C.G.?

I'm running a Saito 1.15, Keleo Muffler with Robart 605's with 685 struts. At first measurement it looks like I'll have to add almost 5 oz to the tail to bring the C.G. to 5.25' LEMAC.

This seems like a lot of weight?

Anybody else have to add this much weight?

I_Fly

Ihave a Saito 1.15 in mine. Stock Saito muffler and retracts. It balances a tad nose heavy (at 5") without any weight in the tail. Batteries and servos are in the standard locations. Ionly have 1 flight on her and plan another for tommarow. Although it flies great as is, Imay move the batteries back near the servos to see if Ilike the CG a little further back.

Carl

RadarController

My Feedback: (2)

I'm having the same issue.. Lado retracts, YS110. I had 3oz in the tail and put two flights on it. Problem is.. She had the tendencies of being tail heavy. VERY twitchy on the elevator even with the smallest input on low rates. She also wanted to climb climb climb until I trimmed her out. SO.. I took the lead off(which I absolutely can't stand even having to use lead). Basically I'm going to fly her this time as is. Plan to lift her off during takeoff, keep her straight and level until I see the flight tendencies. Otherwise I'll set her back down and plan to fabricate a battery compartment behind the tail wheel.

jamesc43

My Feedback: (2)

How did you get the Keleo Muffler to fit the ARF P-51? I've been looking at their website and they say that they do not have one for the ARK. I think it because the large beams of wood that the regular exhaust mounts to. Please let us know. Do you have pictures?

PHague80

I was able to mount the Keleo inverted pitts although some of it sticks through the bottom. (Much less of the muffler sticks out like a slimline.) I had no problem mounting the muffler and it looks great. I 'll see if I can get some pictures when I get home next week.

Very impressed with the Keleo. Looks like a good muffler and I'll probably use them in the future.

PHague80

With my current set up (No weight added) the CG is almost 1 1/2 to 1 3/4 forward of the 5 3/8 stated in the instructions. I believe it is because the Keleo is such a light muffler. The battery in the place specificed in the instructions althought I may look into moving it further aft. I belive with the 1.15 I should have the power to pull almost 5 extra oz's around. Swing a 15 x 8 prop.

We see with the first flight on Friday.

Kenpilot

I'm having zero problems with myO.S. 110FSa on my TF P-51 ARF. Just I saw a picture of an engine mounted on a shock mount setup that looked sweet, wondered if guys are using those for engines like the Saito 100 and the O.S. 110 4 stroke. Sometimes I like to put a camera on my airplanes and shoot some in flight video. Have not tried it on my P-51 yet, but thought it might shake too much. Will give it a try here soon.

Meanwhile, mine is flying sweet with the O.S. 110, Century Jet retracts, and factory C.G. Yes, it is a little pitch sensitive, but I personally like it that way. My landings are improving...partly due to getting more flight time on the aircraft and partly because the grass is dying out there, getting flatter, so fewer nose-overs. Also, I doubled the elevator travel on high rates to help prevent that nose over tendency, only using after touchdown. It's a tricky maneuver, but it has been working for me.


Love this aircraft!

Mustang Fever

My Feedback: (2)

Signing on while I wait for mine to arrive. My goal with this one is: "simple and light". My kit built 1/7 Top Flite P-51 was destroyed in a crash last fall, mostly because it was way too heavy (12.5#). I'm going to stick with the factory retracts, a 75AX, and no additional scale details.

Corsair Jock: I found your advice on elevator travel, trim and the CG relationship. Makes sense to me. P-51s with the CG far enough forward to not be a little "twitchy" just won't slow down properly for landing. I've had good luck setting elevator travel to the high rate value, then using at least 50% expo to smooth things out. (That's the way I have my TF B-25 ARF setup, and it flies very nicely.)

RC-CAKES

My Feedback: (4)

Well a little post of my flight today. I have been busy looking for a new job..finding and now business traveling, I have very little time for the hobby these days. I have flown the mustang once this year. Today I was able to get out and take her up. I did a pre-run up the night before to clear out the after-run and make sure she was ready. I checked all throws, programming, batteries charged..etc.

Calm winds at my favorite wide open soccer field.. I have the place to myself! Grass takeoff with half flaps.. zoom! Great flying and she handles great. I tried a 14x8 Evolution from my 15x8.. runs good at this higher altitude. After 3-4 minutes in.. I noticed the exhaust note changed... A bit louder and deeper. I did a few rolls and loops..and the Saito stuttered.. I thought, no way a low fuel issue. She usually purs and never hickups at all. She will go as fast as you want to push her.. no problem.

I dropped gear and trimmed up with full flaps. A beautiful touchdown and rollout. The problem.... the #&@&^@ banjo style bolt backed off the Keleo exhaust! I check the tightness about every 3 flights... and it has never been lose. Well... there ya go!
The bad.. the bolt is gone.
The good.. I can get an improved replacement; The actual exhaust stayed inside the cowling and didnt fly away!; and the best part the tank pressure tap obviously failed and I am glad that the engine didn't stall.


So those of us that fly the keleo check your torque on the bolt! Fly safe!

stang151

With the new bolts Keleo packs a tube of sealent . Keeps the bolts alot tighter longer.

alienteabagger

Hey 'Stang Brothers! Whew, 3 days to get through this entire thread!

I got one of these beauty's two weeks ago. I must say that Top Flite does a kick-ass job with their manual. Powered by an OS FS-91, I had one of my buddies maiden her for me. I set the CG to be a tad nose heavy at ±5¼" sans fuel. Rollout was uneventful with the gradual application of throttle and the take off went off without a hitch, soon as the gear was retracted she required some down trim to stay level. HOWEVER the OS decided it had had enough of being airborne and decided to quit during a swooping left turn.

Now, all I have ever heard about Mustangs is that they glide like typewriters, so I was pretty sure that I was watching the end of her. Much to my surprise, he put her into a shallow dive and lined her up for an easy landing. BUT she glided so well that he overshot and was quickly heading towards a fence! So I yelled to him to pancake it down! He plunked it down from about 3' up about 10' from the fence and I watched the plane bounce about like an injured pelican. Once I retrieved her I was delighted to find that there wasn't any major damage! One of the landing gear was slightly tweaked (cracked the rear mount rail) and the ply where the wingbolts screw in had broken and come clean off the inside of the fuse (check the pics)!! Took her home and with some time, epoxy, and alot of dremelling, I repaired and reinforced the cracked landing gear rail. Beefed up the one that wasn't broken and fixed the wing mount by punching out the blind nuts and making some doublers out of some basswood.

This is one rugged bird!