RE: Nitro models pusher Bobcat?
 

I have a set of spring air 305's that I am going to mount in a retract ready Bobcat 50. The main gear will fit fine. However, the nose gear will need some mods to work properly. The rail is set for the gear mounting flange on the wrong side. I will need to cut the rails and recess them up into the fuse. I think the Robart 520W1's might work better—check them out.

RE: Nitro models pusher Bobcat?
 

Todd,
The bottom teeth were in the tops were soaking LOL!! You better be at the field..if you remember how to get there :)

RE: Nitro models pusher Bobcat?
 

Thanks for the heads up Larry, I'll look into that.

Mike

RE: Nitro models pusher Bobcat?
 

Please help

How do you mount your fuel tank in your bobcat 50. If I do it like the manual sayes the clunk is pointing to the tip of the plane, can this bee right. I would think the clunk should point to the rear off the plane.

Thanks in advance

RE: Nitro models pusher Bobcat?
 

Hey Frank40, You are correct about the fuel tank, read this, it is very helpful >[link=http://www.rcuniverse.com/product_guide/kitexpertreview.cfm?editorial_id=565&kit_id=4554]Bobcat Review[/link]

RE: Nitro models pusher Bobcat?
 

Here is my Bobcat, and I want to know what do I do to find more rpm?

My engine is an OS 55AX and the propeller is APC 11x7, I have a Bobcat Ducted Pipe, but maybe a need to cut the header. Right now a found just 13300 rpm.

RE: Nitro models pusher Bobcat?
 

Hi Guys,

I bought the one that is retract ready. I ordered [link=http://www2.towerhobbies.com/cgi-bin/wti0095p?FVPROFIL=++&FVSEARCH=521RS&FVPROFIL=++&se arch=Go]these retracts.[/link] Now I see that these need struts to work so I am having to fashion some adapters so I can use music wire. Nothing like learning everything the hard way.

The next obstacle I ran into was that the nose gear blocks were loose. I was able to remove one of them by just pulling with my fingers. Unfortunately, when I tried to epoxy it back in I broke loose the forward former that holds the front of the blocks while trying to push the block back into place. What a hassle that was.

Here's my question. Do You normally use a pull-pull cable system to steer the nose wheel? How else can this be rigged?

Also, Is the spring down type retracts a good way to go? This is my first time trying to install retracts.

Thanks, Terry

RE: Nitro models pusher Bobcat?
 

Terry,

Pull pull is a reliable way to set them up. Use rubber bands to pull the cables outward when the gear is retracted. This will keep the wire from getting in the way when the gear goes down. Spring down is the best for planes without cycling doors. With these if you lose pressure the default is down. PLus if you forget your pump, you can still fly.

Mark

RE: Nitro models pusher Bobcat?
 

Thanks Mark,

One more thing, the set came with a pretty small tank. Is this sufficient for this. How many cycles should I expect with this size tank?

Thanks, Terry

RE: Nitro models pusher Bobcat?
 

Terry,

Good question. I would set the timer at 4 minutes initially. That is about all I get with my YS45.

Mark

RE: Nitro models pusher Bobcat?
 

Hi Mark,

Sorry I wasn't more clear. I was talking about the air reservoir tank for the retracts. You are right about the fuel tank I'll bet. I think it is 12oz. I think I got about 6 1/2 minutes on the 12oz tank on my bench stand when I was breaking in the TH .75. That was running ST 0% nitro fuel with a cup of caster oil added to the gallon. That was running almost a full turn rich from peak. I was hoping to get a little better in the air but who know how much fuel it will consume once the prop unloads. If all goes well I will be flying it this weekend.

I used to run a YS45 on a Hots years ago. I loved that engine.

Blessings, Terry

RE: Nitro models pusher Bobcat?
 

Eh, those have the nose gear set for firewall mounting....

Don't you want to mount the gear into the blocks instead?

e,g. use [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJZE2&P=7]THESE[/link] instead?

You could always order a single replacement front gear.

BTW: Tower will exchange them for you by crediting your card for the RMA...

RE: Nitro models pusher Bobcat?
 

At 90 psi without leaks you should get 3-5 strong cycles and a maybe another couple weak cycles.

RE: Nitro models pusher Bobcat?
 

I am reading my way through this thread. Up to page 34 so far.
You guys accomplished a lot in 8 months. I think I have enough information to go out and buy one.
I have been price shopping at the following 2 web sites.

http://www.texasrcplanes.com/index.html

http://www.nitroplanes.com/

NitroModels

BobCat $129.00
S/H 31.08
Total $160.08


Texas RC Planes

BobCat $119.95
S/H 14.98
Total $134.93

Gee, I wonder which one to buy from?
Thanks guys for all the good info.
I do have one question.
Which of these engines would be better for the BobCat?
YS 40SE with a tuned pipe
OS 55AX Standard exhaust
I thought I saw where someone was getting 90 MPH with the YS 40 set up.
How fast will the plane go with these two engines?

Thanks in advance
Greg

RE: Nitro models pusher Bobcat?
 

$37 to ship from Nitroplanes I just saw. Anyone else sell the retract ready version??

Tumbler

RE: Nitro models pusher Bobcat?
 

First of all, who cares? Second, if it bothers you that much call Bob Violett. I would rather read the daily posts about the cool Wal-Mart sub, the thread on the DL-50 and Bruce Tharpe Reaction You guys have too much time on your hands.

RE: Nitro models pusher Bobcat?
 

Here is another pusher looks cool !!



http://www.kmp.ca/product_info.php?c...68157b91e335ae

RE: Nitro models pusher Bobcat?
 

Do you mean YS-45? The YS-45 is a VERY powerful engine when run with a pipe (7.5cc). I am not very familiar with the OS-55AX however. On smaller prop-jets like a Patriot the YS-45 is close to the Jett-50 on performance-

They sell a retract ready version? That is what would make me get one :D

RE: Nitro models pusher Bobcat?
 

Nitroplanes.com. Before you click to buy, there is a box that says you can add retract ready version for $10. Cost me $37 to ship. Thats my only hesitation. I am going to put an electric motor with 6.5lbs of thrust on her. Software gives 144mph pitch speed, so taking drag of the airframe...it should do between 110-120.

Tumbler

RE: Nitro models pusher Bobcat?
 

Not sure about the 40, but you can see radar gun video passes of mine with an OS55AX here:

http://www.rcuvideos.com/publish/item/BF12G8M922KX440V

If you're interested that is.....

Bruce

RE: Nitro models pusher Bobcat?
 

Thanks for the video.

What size prop do you have with your OS 55AX?

RE: Nitro models pusher Bobcat?
 

I use an APC 10X8P. I'm planning to experiment with a 9X8 to get more rpm. We put a regular tractor (puller style) on in that size just to tach it, and got almost another 2800 rpms. I know it will lower my low end but since I fly it at about 70% power or more the entire flight, I got hopes on a few more mph on the top end. I'd like to be able to get it over 100mph, but the tradeoff may not be worth it.


Bruce

RE: Nitro models pusher Bobcat?
 

Bruce,

Didn't think the 55AX would pull the plane that fast.
Good job.

The YS 45 I have, has only been run on the stock muffler.
Is this engine user friendly with a pipe? What would be the best pipe to buy?
What would the approximate speed be with the YS 45SE on a pipe?

Thanks in advance,
Greg

RE: Nitro models pusher Bobcat?
 

Greg,

A tuned pipe and friendly are not 2 words you generally see together. Everything is a trade off. A tuned pipe will give you the most top end power at the expense of low end and in many cases your transition will suffer. A Mac's 7.5 or 8.5 cc pipe will do. Either way you still must tune the pipe to your prop, plug and fuel. I am running mine at full length (because I've been too lazy to tune it) and it does ok. Currently I have a 10x6p and will go to an eight pitch or better soon.

As for top speed, if you don't have the retract version, I think this plane is limited due to drag. If you want it to go faster add retracts, gear doors, put all servos and linkages inside and seal all of the various gaps.

Mark

RE: Nitro models pusher Bobcat?
 

I used to run my YS-45 on a full length pipe. I never tuned it and it ran great. Transition was very smooth and it was one of the most user friendly engines I ever owned. My YS-60 was the same way. I tried it with the stock muffler and there was no comparison in power. It is like a totally different engine with a pipe installed.

Blessings, Terry