How to build a RC Jet B-1 Bomber #100

[JusticeQLD]

Fly it to Australia

[fiverats1]

Epic father son project

[flyboyy77]

Empty weight is without fuel in the tank

[flyboyy77]

Continued from earlier post:

F= the weight at the nose weighing point.

L= the horizontal distance measured from the main wheel weighing point to the nose weighing point.

W= the weight of the aircraft at the time of weighing.

Hope I was some type of help:)

[flyboyy77]

It is more convenient to locate the Datum and CG using the centerline of the main wheels as a reference. When this is done, the empty weight CG is determined through the use of formulas. The formulas are based on whether the CG is located forward or aft of the main wheels.

Datum forward of the main wheels:

CG= D-(F x L/W)

Datum aft of the main wheels:

CG= - (D+ F x L/W)

Note: anything left of the datum gives you a negative arm

D= the horizontal distance measured from the datum to the mainwh

[jjjazzycraig]

i wonder if homeland security is going to visit you?!?

[jjjazzycraig]

i would insure this thing with more coverage than i have on my wife.

[fastandfurioustokyo]

@jjjazzycraig lol,

[24bundlz]

your gonna need a good radio control,that thing is huge long range type shit

[JoseKagan]

hey bob its that time again? WHERES OUR NEW VIDEO!!!! COME ON MAN WE NEED TO KNOW WHATS HAPPENING!!!!

[alexbin117]

Sorry sorry, I jumped to conclusions too quickly!

I was missing the fact that the CG will change depending on the wing configuration

[fcrcfc]

How much is this thing gonna weigh? What engine are you gonna use? Where are you gonna fly it? My god I have so many questions, sorry I am coming in late on this.

[dr3wl]

Re: "What engine are you gonna use?"

Watch Video #53 of this project

[qbsaber]

cog,cl who cares?? its COA

"Centre Of Attention" that matters. Good on Bob for making this fantastic series on your build project.

Cheers

Brian Melbourne Australia

[WogsRus1]

Dam it i can't eaven spell. TASMANIA

[WogsRus1]

Tanzania, Tasmania same stuff different day, But not actually i'm from Tazmania near australia and yes it's true what they say about tasmanias, lucky i'm a wog then hay.

PS. Wog in Oz means a person from Italy, i'm a pretend wog as i am Polish.

LOL

[mrskyking737]

Hornitpilot, have you built any full size, passenger carrying aircraft?

[mrskyking737]

Commandos and lynch mobs? hahaha

[alexbin117]

Why oh why would your CG go forward when your wings are adding more weight to the back???

I love your videos man but don't say stuff like that

[kingpav]

Watch some of the video around the 50 mark... they used a smaller model to test what would happen. I think it was in the mid 50's.

[mrskyking737]

The wings are the lift. Imagine for a second that the CG is right between them. While they are moved back into the swept position, the REST of the airplane moves forward, and therefore the airplane becomes nose heavy. Full up elevator might not be enough to maintain pitch. Sweeping the wings might technically move the actual CG back the way that you're thinking, if you're landed, but the required CG for flight in that wing condition would be further back, too. Some movable weight might help.

[ptwolfe99]

You could add the weight to the wing so the CG changes correctlly with the wing change.

[mrskyking737]

That's true! In fact, they even mention it during this episode, toward the end. It's one way (the easy way) to move the movable weight that I mentioned. I never would have thought of it though, the simplicity is beautiful.

[ptwolfe99]

The effective CG moves on the wing. Think about what you are saying man, There is only one way to tell, and that is to run a calculation with the change of weight, which can be done with a scale, and the recomended CG with the change in the wing.

[kingpav]

The C of G issue can be avoided by using the mixing features of the RC controls as most computer based radios allow another channel to be altered whilst controlling another. In this situation you would tell the radio to alter the neutral position of the elevators according to the sweep angle. Initially you would do this with trimming but once the trim distance is known it can be programmed once safely on the ground. If I recall correctly it known as compensation mixing.

[jpatt1000]

Won't the stainless hinge bolt fatigue and crack? I know it it doesn't have the tensile strength of a grade 8 steel bolt, but how does it compare in shear strength? Love the videos, can't wait to see it fly?

[robertsickels]

@jpatt1000 That bolt has about 76,000# Shear load. I think it will hold ! If it breaks he has other problems.

[jpatt1000]

@robertsickels So stainless is only weak in tensile, other than that, strong as hell? I've had to drill some at work and it took a while!

[nkhbowler]

Bob - I've watched the videos for some time and think it's brilliant! On the CoG issue, I think that it will move backwards (weight of wings moving back), but you get a pitch down because the Centre of Lift moves backwards further giving a downward turning moment - but I could be wrong. And someone's probably already pointed this out, but the island south of Australia is Tasmania. Tanzania's in Africa.

[0MoTheG]

In the real planes the CG changes at speeds >mach, even without the wings moving.

the CG needs to move back as the plane passes mach 1.

[gsidaho]

Bob, great 100th. I check everyday for a new post. You might think about a chain and sprocket for your stab, something like a motorcycle throttle. This would give you more radius for better leverage and spread the forces out on your collar. You could run a double cable to your servo.

[prereed]

Outstanding 100th video.

[bloodyrare]

Yo Bob's you have forward canards to trim cg love to see windshields and info on your cockpit lookin awesome as always

[jaygdav]

gee, why didn't I think of that?

[gsishta]

Happy 100 from India! Keep on chooglin'!

[b101aa2]

tip: when using that bondo to mold it up and make those bulkheads, stick balsa strips (length wise) into the bondo before it sets up to add more strength so it doesn't break off like that. mixing sticks work too. i just use balsa strips, 1" W X 6" L, cause i always have piles of them laying around in boxes.

[b101aa2]

i forgot the secondary tip. instead of using masking tape to ply the bondo too. use plastic sheeting (like some scrap monokote), and using regular old scotch tape to hold it in place. once the bondo is cured, peel off the scotch tape, and the entire bulkhead mold will pop off with less force then a thumb tack.

just a general tip for those who want to make life easier.

[TheTruckingLunchbox]

i cant wait!!! this thing keeps getting better and better every video that comes out. i cant wait till this baby is done...

[MadPiper999]

Putting a bolt through the flange of your carbon tube seems like it will give a very short leverage arm for swinging those massive elevons. Are your servos strong enough to handle that?

[Xnaron]

NIce job so far....it looks like the head of the bolt that the wing pivots on will interfere with the hatch cover. Will it fit?

[rcplaneguy1]

this is gonna be rc?!?

[robertsickels]

@rcplaneguy1 , the short bus will be by to pick you up shortly.

[rcplaneguy1]

sry for asking you seem to know much about the short bus :P

[robertsickels]

@rcplaneguy1 Sorry, I was kidding. What is the title of the video? That will give you the answer.

[ChamplainDivision]

Hey, give the guys at Dyess AFB a lat/lon/min on your house so they can do low level practice bomb run passes (at minimum legal VFR altitudes, of course). A fly-by and a wing wag every once in awhile ought to provide loads of motivation!!!

[horizonflyer9]

damn i never realized how massive this plane is until you put on that wing... will this break the record for the world's largest rc plane when its done?

[BoredMusicians]

Yeah right...Tanzania is below Australia...

Do you mean Tanzania, or Tasmania?

Your work is awsome...but thats so wrong.

[0MoTheG]

yeah sounds like they mixed them up.

no reason to give you thumbs down for pointing that out.

[vinkeck]

hornitpilot you are a legend

[longsweep1]

Hornitpilot are you going to put lights in the wings or fuselage?

[Demasys]

Once again looking great. Use should use lots of WAX under the Bondo it will help with the release! I think -_-

[gatornation151]

Wow until you put those wings on i never realized just how massive this plane was..awsome plane awsome vids..good work and good luck!

[Flyingfast79]

I hope the Air force donates some money to him since he's building such an amazing American made aircraft. Just one of those engines costs about $2000-$4000, could be more, that's an estimation.

[scv405]

They're about $5600 apiece, and I hope the Air Force has more sense than to waste tax payers money like that.

[RedneckResponder]

Rub that yellow paper with chapstik and lay the bead of bondo over it.

[jaygdav]

When the B1 would fly real low and at high speeds there would be a flexing of the fuselage, so the engineers add the fwd canards near the nose. I was thinking you could use these canards as automatic pitch trims when you sweep the wing............... just a thought

[superjol]

holy shit, that's one big plane

[harveymacdonald]

welll done its the 100th vid keep the good work up its looking great

[elrenno]

I noticed something that might cause a problem. You showed the hatch covering the place where the main wing hinge pins go in. From the way it looked on camera, when you get that hinge pin fully installed, I'm not sure that hatch will go back on. Doesn't look like there's enough room there.

[tehGrid]

Check out #86 - the pins were in when the two halves were joined so there is room.

[elrenno]

Hey, you're right. I had completely missed that. I thought sure that there was a problem when I saw this video. Good catch. Thanks.

[graffiticrime]

you are talking to the pros man he knows it will fit

[elrenno]

I know, but sometimes the video makes it look like things are off a bit. I should know better.

[lockout45]

Hey Bob Jr & Bob Sr happy 100th video buddy she's looking great.

Cheers Patty

[Quokka57]

Regarding your change of CG and the nose pitching down as the wings sweep back: I believe the F-111's had their wings actually kick up - about 1.5 degrees - to automatically compensate for the nose-down pitch while sweeping.

I'll do something similar with my swing-wing project by setting the main pin in a rose-joint so that I can dial in some 'rake' on the pin when viewed side-on. A rose-joint lets me choose any angle I want, as the model may fly differently to the real-deal.

Q:)

[AGrandt]

I guess that as challenging it has been so far, it's the hard parts you are getting to now, getting all the moving parts, moving, preferably in a controlled manner :)

Good luck, I'm looking forward to see this beauty fly. Same goes for the SR-71 by the way.

[dorkf1sh]

I wonder if you strenghtened that line of Bondo with a strip of carbon fiber would it hold together better and not break in half on you like that one strip did? May not be worth it, just a thought.

[Quokka57]

Was gonna suggest the 'Bondo' trick too - only using Milliput Putty instead. Though with something the size of the B-one, you'd be going though a few packets just for one template! LoL.

And Happy 100th!

Man, that sure is a lot of hours watching by now - hell, I'm even starting to talk with a Texan accent :)))

Keep 'em coming - we love it out here.

Q:)

PS - what they say about Tasmanians is all true :-)~~~~~~~~

[nickersucker]

Ah ha ha, no no. I think you mean Tasmania. Not Tanzania (east coast of Africa). Don't worry, we here in Australia wonder about those Tasmanians also. People say they are known to walk around with two heads and enjoy the company of their sisters, but that's just mainland talk.

[dingo7222]

What seam?

Great job on the bomber!

[Bearnick]

Happy 100th! . Best series on youtube

[flyby8906]

100th episode congradulations Bob as always top notch stuff, love it. Been following you from the start just keep getting better all the time thanks.

[m93sek]

can just agree in every point - would give a much to be so professional like you... keep going!!!!!!!!!!!!!!!!!!

[f15chase]

Hi Bob,

You mentioned that Butch was going to post a video. Did me post and what is it listed under?

[tblawson01]

Bob do you have a po box ?

[jonasmajewski]

WOW!! What a beauty!

[insAneTunA]

How many people know were Tanzania is ....?.... 13:10 ROFL !!! The right answer to that is, Tanzania is in Africa, and not next to Australia :-)

But I think you meant Tasmania :-))

That was a good one guys !!!!

Greets from the Netherlands, in Europe, next to Belgium Luxembourg and Germany :-)

[insAneTunA]

This is a perfect and original old school BLOOPER guys! lol

[insAneTunA]

P.S.

Congrats with the 100th anniversary !!! I hope to see another 100 videos from as many projects as possible !!!

In other words, keep it up and keep them coming.

[tehGrid]

Wow!!!

[rcflygare]

happy 100!!! The bomber is coming along nice :-D

[PatBALEX]

Wow Bob, that looks great!!!! Your work is top notch!!! I've learned a lot from you...Thanks.....My nephew came to me last week and asked me to help him build the X-Men's Blackbird jet...Following your steps I'll start with a plastic model and work up from there...Thanks again....5*****