RE: Regal Eagle - A Journey
 

I feel the need for speed! I'll be there!

I suppose the motor, although still very rich, is already turning way more RPM than.. say... an LA .40 with the same prop.

I gotta see this.

RE: Regal Eagle - A Journey
 

Stick flashback!

RE: Regal Eagle - A Journey
 

If you want that OS .92 to live, you need to reduce the nitro to 5% and run at least 23 % oil in it when you finally get it leaned out. Hi nitro, hi RPM and lean runs = holes in the piston. Make sure you have a nice smoke trail with 23% oil and you will be alright. Some have added an oz of turbine oil to their fuel to get it to 23%. I always used Wildcat Jet A 5%. They already have 23% oil in the Je tA.(Klotz)

RE: Regal Eagle - A Journey
 

LOL. yeah, Tom, it's just a TINY bit more powerful than the LA .46 ;)

And no, shakes, no stick flashbacks...well, except maybe for the inverted pass down the runway part. We'll try to avoid the tail slide from 20' part though. :)

Terry,

I mean no disrespect here, as I'm certain you have more experience with these motors than I...however, I must ask why OS reccomends 10% nitro for breakin, and up to 20% nitro after break in if anything more than 5% is unsafe? I mean, granted, they don't warranty the things, so I suppose we could presume that they simply don't CARE what you do to the motor...that seems somewhat counter productive for their market image however.

Again, no disrespect intended, and please correct me if you think I'm off base here, but I'm inclined to think that a majority of owners simply run these things too lean, trying to wring every last rev they can out of the poor things. I mean, sure, they might turn an extra 2000 rpm as lean as they'll go, but you're just ASKING the engine to blow up.

Now, I grant that Cool Power 10% has less oil (17% iirc) than you're suggesting, so that alone could be putting me in danger. I'll certainly look into the idea of adding some oil as you suggest, and see what the consensus of experienced pilots is.

Seems to me though that if, as you suggest, one leaves them rich enough to leave a nice smoke trail, and sticks with fuel OS reccomends, that their really shouldn't be any problems. Do you disagree?

RE: Regal Eagle - A Journey
 

YES!

Terry is absolutely correct. Use only 5% nitro and use a DF fuel such as Wildcat Jet A or PowerMaster Ducted Fan. Install an inflight needle and make sure the smoke trail is always visible. Other wise, you better stock up spare OS.91 parts.

RE: Regal Eagle - A Journey
 

As fuel like blue thunder and similar are designed for high reving car engines that have no real form of cooling I wondered if this type of fuel would suit ducted fan engines as well

RE: Regal Eagle - A Journey
 

gordon,
i agree with terry, all the fuel i run through my fan motors is byrons 5% nitro with 23% oil(byrons orignals in ida grove IA. is only about 40 miles from me thats why i run there fuel) i have also run 0%nitro with 23% oil and it works well also dont go any higher than 5% on the nitro o.s. suggests this from a bench test (thats what i was told from a relibale source) once you stick in your jet with little air for cooling things can get ugly in a blink of an eye

as for your retracts i will post some pics here for you soon (its 10:00 and im not going to the shop tonight)of the two different styles from b&d for the nose gear yes mine are b&d also

exair
car or buggy fuel wont work in a ducted fan motor the nitro content is wayyyyy to high

RE: Regal Eagle - A Journey
 

Thanks fo the input, guys. Certainly something to check into.

At this point, I really have to ask...do you think I'm harming the engine by breaking it in with 10%/18% at this point?

RE: Regal Eagle - A Journey
 

GR, please expand on the inflight needle. Are you saying that it would not be sufficient to leave the basic carb setting intentionally rich? Do you have to constantly adjust in-flight? Do you ajdust the mixture when slowed for approaches or something? Thanks for sharing with DF newbies.

I further assume that running out of fuel accidentally (and allowing the motor to lean out in the process) could easily cost you a motor? (not that Grodon would ever let that happen anyway).

RE: Regal Eagle - A Journey
 

Most of the time you will not touch your inflight needle during a flight. But every once in awhile, you will have an engine run that starts getting lean. With an inflight needle, you can richen it up and keep flying. Without one, you have the possibility of a blown glow plug and dead stick (kiss of death to some models) and possible damage to the engine (piston / sleeve / cylinder head). It's just good insurance to have one.

On another note, I hope you guys know that you need to loctite all of the engine bolts. I used loctite 271 (red) on the cylinder head bolts and Loctite 242 (blue) on the rest. You will also need to use blue loctite on the nut holding the fan on. (and the spinner bolt if it's a Dynamax).

If your retracts are metal (Robart / SpringAir), you may want to also use blue loctite on the side frame bolts. I have seen retract units come apart inflight.

RE: Regal Eagle - A Journey
 

Gary,

thanks for that explanation...I'd planned on using an inflight needle adjustment for just that reason. :)

And yes, plans are to loctite all appropriate bolts. :)

RE: Regal Eagle - A Journey
 

All excellent advice.
Man, these DF's are a lot more complex than just throwing a stick in the air, huh Gord? Obviously pushing the ABC motor to it's design limits in return for wicked awesome speed! LOL

Bob/Gary, I've also overheard a convo once upon a time where someone was saying something about having to replace pump parts or some such thing every once in a while on their OS DF. Does this ring a bell at all? I didn't pay much attention to what they were saying at the time, since I didn't even know anyone first-hand flying DF's. Since Gordon's motor is not a pump (I don't think?) does that mean it does not apply in his case? Or will these motors, with proper care, last quite a long time maintenance free just like any other well made 2-stroke?

RE: Regal Eagle - A Journey
 

Gary

Thanks for the heads up on the retract bolts as well as the motor parts. I did not know either. If you use red locktite, how do you break it loose if you need to get em off. Is it an issue?

bob branch

RE: Regal Eagle - A Journey
 

Red loctite releases with heat, but I've never had to use heat to get the cylinder head bolts out. In fact, if you have a lean run the bolts may still back out on their own. Good thing to check them occassionally.

The large OS DF motors don't use pumps. The OS DF motor can be fairly maintenance free if run on 5% DF fuel and not allowed to run lean. But if you run one long enough, you will be servicing the bearings and piston/sleeve asy. You just can't turn that kind of RPM without some parts wearing.

You can run an old worn prop motor and still go flying your sport plane, but with the DF motors we typically need them to be putting out 100%.

RE: Regal Eagle - A Journey
 

Couple of fuel questions for you gang:

1) Donnie, can you suggest a source for the Byron DF fuel you mention? I can't seem to find any reference to it, even on Byron's website.

2) Does anyone have an opinion, good bad or ugly, about Wildcat DF fuel, as sold by tower here: http://www2.towerhobbies.com/cgi-bin...?&I=LXA317&P=0

3) Do you guys think I'm risking the engine if I continue to do the break in with the cool power 10%/18% I've been using? Obviously, I'd want to switch to the 5% before final needle adjustments, but I'd like to know y'all's opinion on finishing the break in process with the current fuel.

TIA

RE: Regal Eagle - A Journey
 

Can anyone identify this pipe, got it with a OS91df and Dynamax combo I bought S/H

RE: Regal Eagle - A Journey
 

gordon
here are the pics of the b&d retracts the one with the double piston is the one you want for a forward sweeping nose gear the other style is for a rear sweeping nose gear if you try to use the single piston it wont hold up and pop out of socket (this is with the b&d retracts) b&d calls the twin cylinder there tail wheel retract (bvm helped design them)
as for the fuel i have no clue i just go down and buy it(LOL) i looked in my stash and i only have 1 gallon left so i need to go get some more i will find out for you though a.s.a.p.

RE: Regal Eagle - A Journey
 

hey guys, here is a pic of a few of my spare d/f motors that are in storage look close at the in flight mixture control yep there wired wide open when your learning to fly jets the last thing you need to fiddle with is setting your air/fuel mixture is there a place to do this?? you bet but not while your knees are knocking and trying to wipe the sweat from your palms so you dont drop you radio and having an eagle eye glued to your jet ill be honest my first 50 flights on my first jet this was me!! scared to death i was going to crash the most expensive model i had ever built then it happens.... yard dart..... now im as calm as i am with my slow poke and now i play around with in air mixture,flaps,and every thing else i can play with in flight is what im saying is keep it simple in the begining wire it open set it rich and try to enjoy your flights im not saying its right or wrong thats the way i was taught just my opion i dont mean to mislead anyone

RE: Regal Eagle - A Journey
 

gordon, You might want to switch to 5%/18% during break in. The motor won't get so hot that the extra oil is mandatory yet. But there's no need to run higher % nitro.

RE: Regal Eagle - A Journey
 

Go ahead and use up your 10% during break in with a prop, just DON"T lean it out. I don't thing it will hurt. There is less cooling with the fan in a static configuration. Just please don't use the 10% when you switch to the fan.

RE: Regal Eagle - A Journey
 

Ok guys...I'm going to be a paind in the butt here :) I'm going to excuse myself from further conversation about fuel selection. I am, as you might immagine, getting conflicting advice from every corner...through PM's, posts here, OS's own reccomendations, and conversations outside of these forums. Obviously, ALL of the advice can't be "the rule"...so, as in many other aspects of this hobby, I'm forced to choose who I listen to so to speak. :)

By all means, please understand...I'm not saying I'm going to ignore any particular person, nor am i saying that the advice hasn't been appreciated...simply that, in an effort to try to bring my own focus back on the proect as a whole, I've made up my mind about which source(s) I'll lean on for fuel information, and will stick to that decision. So, I'm simply not going to actively participate in further discussion on the issue. :)

I certainly don't want anyone to stop talking about it...by no means am I the only person this thread can serve, and others may well be seeking more input on this issue...so, by all means, please share your experience and opinions...just don't be offended if I don't jump in. :)

RE: Regal Eagle - A Journey
 

gordon
i understand completely enough said..... ;)
did you get your retracts yet?? as tom was asking earlyer i changed the spring so they would drop completely inside the fuse the wheel has been moved forward 1 1/2 inchs and im still 3 3/4 aft of the c.g. i think im cutting it close but im sure it will rotate on takeoff with no problem i had to order more hinges from sonic troincs got them yesterday so i should have the doors on the mains this weekend:D

RE: Regal Eagle - A Journey
 

o.k. what the hell did i do to make my last post do that???at least you can see the pics LOL

RE: Regal Eagle - A Journey
 

anybody need a fan?? go to ebay go to rc parts and acc. then type in ducted fan somebody is selling a ton of fans and motors

RE: Regal Eagle - A Journey
 

Donnie,

Don't have my retracts in yet, but those pictures sure do help me see how things will go when I get them. In fact, I think they help me see how many lines of grain there are in your sheeting! ;)