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Home✈️Aircraft🚁HelicopterThunder TigerOther › Gas Powered Raptor 60 - Project Time
07-17-2006 04:02 PM  14 years ago
colin8

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Phoenix, AZ

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Lookin' good! I imagine when you're done, you will realize it wasn't much more work to "do it right" and you'll be happier with the result. The only negative is if you find you don't like the motor. Even then if you decide to sell it, you've added value.

It appears that there was enough throttle shaft length exposed on the carb so you made your extension to fit over it - nice.
I hit them with some resin and strained them and they're now pressed in between 145lbs of weight.
What do you mean by "stained"?

--Colin--
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07-17-2006 05:02 PM  14 years ago
trinitronman04

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RTP, NC - USA

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It's strained. Basically I squeegeed the excess resin out. It came out looking real nice! It will probably be tonight before I get to work on it again, I'm not a real big fan of working in the garage with it's pushing close to 100*.

Thanks again for the drawing!

If this engine doesn't work out to my liking, i'm going to buy an airplane for it

I honestly don't think I will dislike it. It seems the majority of the people who have tried it were disappointed in it's performance as it relates to 3D and aerobatics. I could careless about that aspect, that why I have 30's with 50 sized engines in them. This is going to be a "cruiser". Think of it as a Honda Goldwing...hahahahaha a sunday driver if you will
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07-17-2006 05:09 PM  14 years ago
colin8

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Phoenix, AZ

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I'm in Phoenix so I understand the heat issue... but it does cure the epoxy fast!

--Colin--
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07-17-2006 05:18 PM  14 years ago
AnnihilaT

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The Netherlands

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This is going to be a "cruiser". Think of it as a Honda Goldwing...hahahahaha a sunday driver if you will
If thats what you are looking for, then you will be happy with this engine. It will give you enough power for what you want and then some. Rolls and loops and flips and even some LIGHT and smooth 3D is possible. You just cant load up the disk too much.




A day without sunshine is like, well, night.
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07-17-2006 07:54 PM  14 years ago
trinitronman04

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RTP, NC - USA

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HOBBIEGUYRC.COM comes thru again!!!

Got my 12-tooth pinion in the mail about 15 minutes ago. Man I wish it would cool down so I can work on this thing without dying from heat stroke
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07-17-2006 10:11 PM  14 years ago
Franconia2

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Shrewsury, MA

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Nice work on the fabricating the throttle extention, wish I had one.

The sea saw arm / bellcrank while not very elegant works extremly well, after the intitial assembly and set up it did not require any adjustment or maintaince.
I agree with Anni, this engine is a cruiser, fine for rolls, loops, FFF. The engine can rev easily to 14,000 but it doesn't have the tourque at this speed. 12,000 seems to bring out the power.

Dave
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07-17-2006 10:46 PM  14 years ago
trinitronman04

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Is there room in the adjustment slots to get a 12/93 in there or will you need to stretch the holes?
yep. I got the 12 tooth in with no problems. The gear mesh is perfect with no tinkering or elongating the existing mounting holes. I now have a 7.75 gear ratio. So in theory I should be able to get some decent head speeds. (12000 rpm 1548 , 13000 rpm 1677, 13500 rpm 1741, 14000 rpm 1806)

Somewhere in there is what I need to just flying around and aerial photography!!!
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07-18-2006 01:02 AM  14 years ago
trinitronman04

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Almost finished. Got all of the servos mounted, & the gyro. I just need to figure out where i'm going to put the battery for the ignition and I'm in business. I need to order some 500ML IV bags & some 250ML IV bags for the fuel cell, but other than that I see a possibly lift off this week some time.


Fabricated a rear servo mount (I got the idea from ProfessorWiz)

Got the Shroud extension in place

And the throttle works like a champ!
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07-18-2006 01:41 AM  14 years ago
colin8

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Phoenix, AZ

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Fuel cell? Where'd that idea come from? Got more info?

BTW; the throttle linkage looks great!

--Colin--
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07-18-2006 01:56 AM  14 years ago
trinitronman04

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Yep. I run large Zenoah powered boats, and a lot of guys use IV bags for fuel cells. The advantage is they don't need a vent, you can't get water in them when you flip over, and you can adjust your CG simple by placing the bag wherever you need it. Try doing that with a hard plastic tank They do have their disadvantages. You need a pump to fill them, or you can use an empty soda bottle with a nipple on it and gravity fill it. If you leave it exposed in the sun while it's full, it will explode & you have to store them about 1/3 full and laying completely flat so they don't get hard and brittle.
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07-18-2006 05:32 PM  14 years ago
colin8

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Phoenix, AZ

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Sounds like a nuisance to me - IMHO. You already have a well fitted plastic tank on the Raptor which is more than enough capacity for the gas motor. The engine has a pump carb so fuel feed is not an issue. You don't have to worry about water getting in and you won't be changing the CG. You would have to build a containment system to hold the bags on the heli and also remove the bags to store them flat. Seems to me that just changing the plastics in the stock tank to gas compatable materials is a lot easier, cleaner and less maintenance.

Since you've mentioned several times about not wanting to put more work into it than necessary, I'm surpised by your fuel cell idea. None the less, I'm anxious to see how you incorporate the fuel cells as I haven't seen them used on heli's before. Keep up the good work.

--Colin--
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07-18-2006 06:03 PM  14 years ago
trinitronman04

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The IV bags have loops on on all (4) corners. It's simply a matter of taking the hard tank out, and using zip ties to secure the bag in place. I like this method because it eliminates the vent, and there is no chance of spilling nasty smelling gasoline unless you rupture the bag, which I've never done (knock on wood). Additionally, you don't have to worry about air bubbles AT ALL. Consider it a thing of the past. That in itself is great news. I ordered 2 bags this am and I'm hoping they will be in by this weekend. If not im going to just use the standard tank, afterall I won't go above a hover for awile (but I will be switch before any FF). I've hated the hard plastic sullivan style tanks since I can remember. Once you go bag, you'll never go back!

This is one of the 1000ml bags that I use in my boats. The 250's are obviously about 1/4 of this size. They fit perfectly inbetween the frame.
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07-18-2006 06:13 PM  14 years ago
colin8

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"...it eliminates the vent, and there is no chance of spilling nasty smelling gasoline..."
That's a nice feature of using the bag.

--Colin--
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07-19-2006 05:58 AM  14 years ago
trinitronman04

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For those of you who have done this, where did you mount the battery for the ignition? I was browsing the CH Ignition Website, and even thought I have the Falkon Ignition I was curious if the battery itself needed to be located as far away from the receiver as well.


John
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07-19-2006 11:17 AM  14 years ago
andrewjamez

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Hamilton, New Zealand

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I have read about a few guys making the same mistakes and they are:
-Make sure the braid is grounded securly to the plug.
-Do not use a regulated battery for the ignition
-Use a seperate battery for the ignition
-keep the ign module as far away from all radio gear as possible.
I am not aware of any problems with placement of the ign battery.
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07-19-2006 02:40 PM  14 years ago
Franconia2

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Shrewsury, MA

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Placement of ignition battery
I mounted the ignition battery on an X-Spec (Freya) under the fuel tank. Used a piece of wood with a bit of foam glued it for a mounting point, then zip tied the battery and foam/wood backer to the frame cross members on the under side of the helo.
The battery is very secure, isolated from vibration and is relatively protected.

What are you using for an ignition battery?
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07-19-2006 02:46 PM  14 years ago
AnnihilaT

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The Netherlands

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I attached the header tank bracket to hold the ignition (some CA first and then a bunch of heavy duty clear heat shrink) so the ignition sits in the same place the header tank normally would.

The battery (a 1500mah futaba nicad was used) fits nicely between the frames on top of the fuel tank wrapped in foam.




A day without sunshine is like, well, night.
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07-19-2006 03:18 PM  14 years ago
carbon_wing

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bowen, queensland australia

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Luv his idea, got a spare st 90 here i good modify. Has anyone looked at fitting it to a fifty, i see you can get kits to fit 60/90 class engines to them, full 3D would nearly be capable.

Cant wait to see how it fly's, and nice work trinitronman04, great job and I hope it works a treat, looks the part.
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07-19-2006 04:16 PM  14 years ago
trinitronman04

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RTP, NC - USA

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Thanks for all the suggestions and advice guys. I should be finished wrapping all the electronics stuff up tonight and throwing it on the charger. If all goes well I will be cranking it tomorrow! (maybe today just to hear the engine run ) but definitely tomorrow. I'm excited. I hope nothing stupid and preventable happens, so I'm going to check check check and double check everything. I'm going to get an official weight for you guys also. I know the stand offs i made, and the carbon air dam total 9.3oz of "extra" weight. I'm not counting the motor mount, because well you can't fly without one, and technically it was a replcement part. Once I get everything going, I'm going to drop the motor mount, clean it up, lighten it, and flatten the corners that then get some of the CNC'D ( maybe like 5 or so) incase anyone else want's to try this. And if i like it, Im building another one....
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07-19-2006 04:20 PM  14 years ago
trinitronman04

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RTP, NC - USA

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What are you using for an ignition battery?
I haven't really decided yet. Either a 4-cell 1500mah(nicad) or a 4-cell 2700mah (nimh). I'm trying to find out if the Falkon ignition is suited for using nimh or not. It doesn't specify on the website.
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