Speedracer2112

Weel it looks like next week before I get to fly her. I just had to look before I left for work. Im gonna need a new exhaust and a new cowl. It was burned in where the exhaust was comming out on the fiberglass on the inside.

I balanced the backplate to the spinner this morning. Boy was it off. Ill shoot a picture when I take her back apart next weekend. I think the FG 20 liked the extra weight. I did balance out at 4 5/8" with out any weight added. I think I'll keep it there for the maiden.

SR

bradyb

SAITO 125, Thanks Pete.

I took the plane and muffler to my local shop where everything was purchased, Frequency R/C in Layton UT (801) 546-4266. I've emailed them the whole story along with pictures of the plane, muffler, and cowl.

bradyb

Hey Man, you found my pipe!
What should our replacement be, I don't think we want another one of those pipes?

Speedracer2112

Fortunately, I don't need the pipe. I have a pump on my motor. I bought it because It looked sweet. (Ooooh...shinney!!)
I called Horizon today and they were going to send out another pipe right away. I told them I dont want it because it will simply fail also and if its in flight it will burn my plane up before I could get to the ground and the header would most likely hit me in the head on the way down!

Bad part is I already cut my cowl for the dumb thing.

Hobby stuff varies alot in quality. Some times you just get bad stuff or quality issues with first runs. The pipe weld was inserted only about 3mm on two sides and .5mm on the other two sides into the flange. I dont know what they were thinking on that one. I think some good old Scotch tape would have lasted longer.

I may just run a straight pipe kinda like this. This is a plane by Modelflyer5 on the FG20 pages.

SR


{akamaiimageforum}/upfiles/263683/Ty66160.jpg

bradyb

What is this pump thing you speak of and where can I get one?

bradyb

Remember this was her maiden flight, I wasn’t very familiar with her flight characteristics. I took off and kept her high so I would be several mistakes high. I trimmed out the plane and flew a couple circuits. I noticed I wasn’t getting any RPM changes between half throttle and full throttle so I decided to take her way out for a nice comfortable approach. Behind me was I-80, so I couldn’t hear my plane that far out. I was flying off an old highway and flying the plane straight at me for landing. I had her about 600 feet out and was lined up with the center line, I had flaps and gear down. I cut her to about half throttle (this is when the engine must have died), I had her straight and maintaining a very gentle decent. Out of the blue she tip stalled and I didn’t have any room to recover.

It was cloudy and would have been impossible to even see the prop stop spinning, let along being able to hear the engine running with Semis driving by at 75 mph behind me. Since I still had her at half throttle I didn’t expect a stall, I though I had a radio blip or an aileron servo go bad.

I finally realized it was the muffler when I couldn’t find the muffler in the cowl or at the crash site, and when I looked in the cowl it was obvious.

Speedracer2112

Some motors come with them, others you can add them. There should be a pump that you can put on a Saito 125.

Try here.

http://saito-engines.info/pumps.html

If you need more help PM me and I will help you. We are kind of clogging up the Blue Nose thread with the header problem.

SR

Pit-Viper 1

My Feedback: (12)

A pump isn't necessary with the 1.25 unless you are doing a crazy install and the tank is located in an unusual spot/position. As long as you have your tank and motor mounted in the recommended position on this plane you're golden. I've been flying Saito for years and even removing the muffler and increasing RPM's there was never the need for a pump. The way I see it is unless you're doing a mod, putting a pump on just gives you another chance for a failure. Not saying it's a "bad" idea, just an opinion. In fact my buddy is finishing up a Telemaster that he installed wing tanks into, gravity as well as pressure from the motor (Saito1.25) would prob be enough, for investment reasons he installed a pump.

Shane

bradyb

I agree and will PM.

As an FYI to everyone, the plane flies most excellent. It is fast and behaves very well in the air with high wing loading. I flew it in a good 10-12 knot head wind and I didn’t even get a bit of tail wag. It flies very much like the full scale and three quarter scale P-51s I’ve been familiar with as a certified pilot. Take off was short at ¾ throttle with some left rudder and elevator management. Other then it crashing it’s first flight was exceptional.

jet22b

bradyb,

You are right about the takeoff throttle setting. I have talk to a pilot who have a real P-51, plus 20 other flying warbird!! ( Yes this guy is rich!!!) He told me the only time he hit full throttle is after the gear is off the ground and the plane is on climb out. I think Hangar 9 has another winner on their hand with this bird. I have yet to fly my baby because of rain, but, if rain this coming weekend, I am going to find some way to keep my TX dry and fly her!!!

BTW: The sound of the real P-51 is sooooo sweet!!!
I would love to have been back in the days of WWII just to hear a fighter group of P-51 takeoff!!!

Sonny
aka
jet22b

bradyb

Or in the 50's when you could buy surplus p-51s, p-47s, p-38s, p-40s for just a bit more then scrap.

ido

Hi
I just got today the mustang.
Can you help me with this:
Is the elevator symmetric ? I.E It is doesn't matter what is "up" and what is down ?
thanks

bradyb

I couldn't tell a difference either. To answer your question, I think so.

mimoore67

My Feedback: (51)

Just chiming in here! If they are symmetrical, then it won't matter obviously, but I would use the side with the edge of the covering that overlaps as your top! That way you don't see the edge from the top!

warbird dan

Hi Jet,

I have a Saito 125 in my Great Planes Ryan STM. It is a great engine - now - but has one problem I haven't been able to solve yet. It seemed to take quite a while to break it in but it tamed down nicely - eventually. Now it is really reliable. Don't skimp on oil in the fuel. It needs at least 18% and not a lot of nitro. I also have a Saito 100 and both engines tend to run hot, especially if you don't keep the oil content high enough. I first tried using 4 cycle fuel but went back to 2 cycle fuel for the higher oil content. The biggest problem I've had with both engines is keeping a muffler or exhaust system on them. They break or throw off anything I have tried so far. In spite of that, I love the way it hauls my Ryan around.

Pit-Viper 1

My Feedback: (12)

One thing I have noticed with the Saito's is they like it a little rich on the bottom. Most people, myself included, tune so the bottom end is very responsive on the ground. When you think of it you're letting it idle then checking transition and if it stumbles a little you tweak it a little. When you're flying you are rarely at an idle so a little richer on the bottom isn't noticed. This will help with the heat problem. Since an old timer showed me this I have never had a hot motor. In fact, believe it or not, I still have the original plug in 2 of my Saito's. One has 3 1/2gal. and the other about 6gal. As long as you don't run them lean you will hardly ever have to change a plug.

As far as the exhaust, same old timer showed me this, tighten as tight as you can then warm up the engine for a few minutes. Shut it down and immediately tighten it again. You will be able to get about another 1/8-1/4 turn on it this way due to the metal constricting slightly. After that you should have any more problems other than getting them off again.

Shane

mike early

Use 2-3 turns of teflon tape on exhaust threads.

800mZero

My Feedback: (2)

good news gentscalled tru-turn this morning they have 4-1/4" P-51 spinners!

Not cheap but I needed one! For the life of me I couldnt get the stock one to balance out with my four bladed prop. Wobbled like a flat tire.

TT-4202-B 4-1/4" P-51 Spinner, 2-Blade $ 116.95
TT-4202-B-120 4-1/4" P-51 Spinner, 120-slot, 2blade (90-120 4stroke) $ 118.95
TT-4202-B-M-DA50 4-1/4" P-51 Spinner, Menz 24" Cut, modified DA50 $ 118.95
TT-4202-B-M-3W 4-1/4" P-51 Spinner, Menz Cut 28-10, 2-blade modified 3W35-100 $ 121.95
TT-4203-B 4-1/4" P-51 Spinner 3-Blade $ 118.95
TT-4204-B 4-1/4" P-51 Spinner 4-Blade $ 118.95

CH Ignitions

My Feedback: (11)

Now that is a great news,

Drop the link for them,I check the site and under P51 can not see them;also from where and how mutch you pay for your 4 blade prop.
For now,my life took an unaspected toll and my project is on back burner.

Thank you
Adrian

800mZero

My Feedback: (2)

tru-turn.comyou will have to call them as I did.

i ordered the prop from zingerpropellor. Just to give you a heads up I have another blue nose mustang kit worth of cash hanging off the nose nowYIKES!!!!

ronin4740

My Feedback: (1)

Guys I'm putting mine together over the next few days and have come across a few parts which don't seem to be mentioned in the assembly manual. One is a thin plywood motor/engine template. I imagine this gets epoxied to the front of the firewall. The other is a thick ply piece with a hole in the center... Doe this get epoxied to the inside of the back of the firewall?

I'd attach the photo I've taken of them but for the life of me I can't figure out how to do that on this forum...

Also I've read some references to "pinning" the firewall. Seems like it would add some strength but I'm not sure what to do to accomplish this. Pointers appreciated.

800mZero

My Feedback: (2)

Ok-98% complete..... Left to do, setting throws and cg, little bit of weathering, guns, drop tanks.

ido

800mZero - GREAT WORK! What is the scale of the pilot ? 1:6 ? Where did you get the pic of the legs and hands ? Did you made it yourself ?

mimoore67

My Feedback: (51)

Question guys,

What is the retract angle on the stock retracts? Do they seem to hold up? What size is the strut diameter? I'm thinking about buying a set for another project?

Pit-Viper 1

My Feedback: (12)

The template is just to transfer the bolting pattern to the firewall, line it up and tape it on then mark the holes or simply drill it out through the template. Instead of pinning you could just epoxy the back or the firewall.

Shane