R/C Blogs - Page 5302 - RC Groups
Posted by JustPlaneChris | Nov 27, 2006 @ 04:46 PM | 19,282 Views
I got the carbon blades from Helidirect today. Wow, are they beautiful! They were within .1g of the same weight, though the CG was about 3mm off. I added one trim monokote strip to the light blade at the tip to move the CG out. It's close, within 2mm now. I don't know how they perform yet, the weather isn't cooperating!

-Chris
Posted by lslewis | Nov 27, 2006 @ 03:32 PM | 4,177 Views
I sold my A-26 actually I essentially gave it away. I had many good offers for the plane but shipping was too expensive. I did an electric conversion of the wing manufacturing short kit. Two errors, too heavy for the then brushed motors and I found out “short kit” means that everything you need is short!

I had the plane on display at the new LHS and was pleased when the owner told me that the buyer was really hot for the plane. The Buyer has big plans for new motors and batteries etc. All of the things I would recommend. Even brought his wife to see it telling her it was and early Christmas gift from himself to himself. My kind of guy.

Tis the season to be jolly!
Posted by Gregg28 | Nov 27, 2006 @ 02:01 PM | 13,713 Views
Attached is a list of planes that my friend and I have had. I think it is all of them, but I may have missed one or two. I have written a few words about each.

One thing that really bothers me is when people call a plane a pice of junk. Typically there will be 4 or 5 posts saying how wonderfull a plane is, and then someone will com on and say that it is . I do not think that everyone realizes that other's comments on airplanes need to be taken in context. There are several factors that go into a person's satisfaction with a plane aside from the plane itself, and these need to be considered:

1) The experience, style and expectations of the person.

2) How the plane is set up, particullarly power system and weight. An airplane with a heavy motor and battery will be fast, but will it be aerobatic?

3) Trim. Has the person spent the time and energy to trim it properly? The charactor of a plane can change tremendously just with small changes in cg.

That being said, in the following table I tried to give enough information to determine how you might like that particular airplane based on your flying style.
I would consider myself an intermediate. I usually go home with little or no repairs. I like to fly aerobatics and am adding 3D moves. I do not like to just fly fast all over the sky. At least not usually. I am working on flying slower and closer in, though I do like Big Sky aerobatics and tumbling.
Posted by Vintauri | Nov 27, 2006 @ 10:16 AM | 11,552 Views
It was a nice day on sat so I got out with a bunch of planes and spent about 4 hours at the field. We had lots of fun and I was trying out my friend camera on my slowstick. We then decided to slap both cameras on at the saem time so mine had to go on pointing down. So we tried to take a pic from right overhead.

Well it worked! Hehe what fun this sport is.

Steve
Posted by histarter | Nov 27, 2006 @ 07:11 AM | 9,538 Views
Mechanics of the Spiral:
This paper is the result of years of flying Free Flight, and concentrating on large 2 channel sailplanes – while studying well-written papers on the subject by free flighters over the last 50 years.

I find it quite interesting when I see discussions on spiral stability, where individuals, who have not mastered Free Flight, or 2 channel soaring, fall into areas of misinformation - even though the individuals may be very skilled pilots. Unfortunately it is difficult to screen through all the details that have become so massive, and thus confusing, about this subject. Most modern pilots develop very fast, and thus end up following trends that work, without the total realization of what is happening. For example there is concern about moving CG (Center of Gravity) rearward to lighten tail loading as a popular theory. What is also happening simultaneously is that CLA (Center of Lateral Area) has been manipulated further back by the modern designers that have reduced EDA (Equivalent Dihedral Angle) to match higher airspeeds for greater altitudes, or reducing the EDA for replacement by ailerons. Hidden within this programming is an attempt to keep CLA ahead of the CG to under-stabilize a spiraling force so that the pilot is not fighting a persistent autonomic tightening of a spiral (because of over-stability), but is now 'herding' his aircraft by needing to maintain control (via stick skill). Obviously, remaining within the bandwidth of Spiral...Continue Reading
Sticky:

raptor 50 titan

Posted by simon53 | Nov 27, 2006 @ 03:56 AM | 2,159 Views
helihobby.com and rc expert.com sell a all metal head 4 a raptor 50. has anybody tried one, and if so what r they like?.... cheers simon
Posted by bill_higgins | Nov 27, 2006 @ 12:16 AM | 6,198 Views
Well tonight was mainly about getting the "Flat Tabletop" setup and calibrated, and getting all of the fuse jigs in place. Brian has made all of his own jigs that just screw into the tabletop, and you simply lay the stuff in place around them. The 2 large disks that you see sitting on top of the engine box are these huge bearings that he keeps to put weight on the engine box, so it stays perfectly still while you trial fit the wing tube. I say trial fit because he doesn’t actually glue the tube in place until the wings are being fit just in case there are any adjustments that need to be made. Although it doesn’t show in the pictures, I did manage to get F2, F3, and F4 installed, so tomorrow I will start dropping in the 1/4" cross bracing.

Bill Higgins
Desert Aircraft

hh

Posted by aviatordave | Nov 26, 2006 @ 11:08 PM | 5,674 Views
ghj
Posted by kingkasa1110 | Nov 26, 2006 @ 08:17 PM | 2,333 Views
Does anyone know the skin friction drag coefficient on a sanded "semi-monocoque" body? I am doing a school project to calculate the drag on the fuselage that we are constructing but I have searched on google and couldn't find any skin friction drag coefficient on sanded "semi-monocoque" body or sanded fiber glass. Please help! Thanks!
Posted by gfdengine204 | Nov 26, 2006 @ 08:01 PM | 2,974 Views
Well, I have ordered my HoneyBee FP2 MK IV, and a computer sim. Waiting for them both. Also been looking online for as much info as I can find. Would much rather learn as much as I can, use the sim, and NOT crash my helo.

Perhaps this blog will be a good place to keep a flight journal?
Posted by wilky | Nov 26, 2006 @ 07:29 PM | 3,702 Views
Well I finally worked up the courage to fly the Pz FW-190 today, I got her a little over a week ago. Went to fly the Firebird and decided i was going to take the 190 with me. I put her up just before sunset, flew her for about five minutes and started to loose orientation because of the withering light. brought her in for a landing......I have a lot of practicing to do as this is my first low wing, first aileron, and first Warbird....She came in safe and sound, a little fast but safe. Is it normal to have the shakes for about 10 after a maiden?

Sorry no pics of vid as I thought I would jinx myself.
Flying a P-38 before long. (i hope)
Steve
Posted by Jeremy Z | Nov 26, 2006 @ 07:28 PM | 13,217 Views
When I bought this kit about a year ago, the plan was for it to be my introduction to balsa and the whole modeling aspect of RC planes.

But I never did get around to it; I get impatient when I'm spending my off-time building or repairing instead of flying. I've since found out that I don't mind working on helis, since that's more mechanical than micro-woodworking.

I introduced my old man to RC last year about this time; my siblings, his mother, and I all chipped in and bought him an introductory setup, an Ultrafly Cessna 182, Hitec Flash 5 radio, batteries, charger, etc. But I'm getting off-topic here. The point is that he likes modeling at least as much as flying. He built his .40 size Piper Cub recently.

So I gave him my .20 House of Balsa Piper Cub kit to build for me. It's not all that scale. It has a hell of a lot of dihedral, an open nose (it was designed for a tiny glow engine, remember) and no ailerons. I'm not big on Cub Yellow anyhow, so I supplied him with transparent blue Ultracote to wrap it in. Since this is my first balsa plane, I was thrilled with the idea of being able to see through the wings when it passed overhead. He did a heck of a good job, I think. The landing gear is not pictured and doesn't have wheels yet. (why they feel this doesn't need to be part of a kit is beyond me ) I've been belly-landing it.

It's got:
  • A Himax 2812-0850 (this is its fourth airframe!)
  • A couple of CommonSenseRC 8C 2000 mAh 3S LiPos
  • A couple of HS-81s for
...Continue Reading
Posted by Pierre Audette | Nov 26, 2006 @ 07:09 PM | 8,754 Views
Super Dimona 2.4m maiden on the 25th of November. Instead of the tricycle gear, I converted it to a taildragger by moving the main forwards and adding a tail wheel. This plane has a remarkable low sink rate, almost to the point I wish it had air brakes or flaps for landing. Pictures taken by Nigel.
Posted by dspecgsx | Nov 26, 2006 @ 12:56 PM | 4,658 Views
I decided to convert a pattern / 3D type of plane from glow to electric. This was originally designed for a YS110 but I'm going to electrify it. It is not a 2M size but next step smaller.

What you see here is 3 lb. 14 oz. I'm going to use 8S but I am undecided on a power plant for this machine. Looks like I can swing at max a 17 inch prop.


----2/26/07 Update---------------------

Finally I have some power data to share:

Motor: Hyperion 4035 - 299KV
Batteries: 2 x 3700 mah hyperion 4s 25c li-poly
Jeti spin 75
Prop APC 15.75 x 13 - 3 Blade


I have data from 2 different collection systems.

(1)Watt meter:
71.6 amps
25.3 Volts min
1923 Watts
7600 RPM - measured from a Tach

(2)Jeti Spin Box:
17 deg C temp ambient
74 deg C temp reached after 3 minutes of full throttle
87.3 amps
26.7 Volts min
7740 RPM - Spin Box

Notice the 15 amp difference between the two methods of measurement.

At least the RPMs were close. My fish scale said 14.5 lbs of static thrust. That's 1.7:1 power to weight.

So since I am around 1900 watts and assuming .75% eff = 1425 to the prop / 8.5 lbs = 168 watts per lb.


----2/27/07 Update---------------------

APC 17x12

(1)Watt meter:
59 amps
26.4 Volts min
1600 Watts
8150 RPM - measured from a Tach

My fish scale said 16 lbs of static thrust. That's 1.9:1 power to weight.

So since I am around 1600 watts and assuming .75% eff = 1200 to the prop / 8.5 lbs = 141 watts per lb.

Interesting note that I have more static thrust produced using less watts.
Posted by BD Flyer | Nov 26, 2006 @ 12:20 PM | 7,941 Views
Yesterday, I visited the Aviation Museum in Cape May, NJ. It was awesome! They had a couple flight simulators and a whole bunch of cool things to show you how a plane flies. There was also about 20 full size WWI and WWII helicopters and airplanes. Also, almost all of the planes and helicopters were open, so you can sit in them and mess with all of the switches and gadgets in the cock pit. It was really cool! On the one helicopter from one of the wars, you could acually see bullet holes in the metal and the glass. Here are some picture of some of the planes there:
Posted by Lee | Nov 26, 2006 @ 09:24 AM | 32,584 Views
Radio, receiver, servos minimum requirement

In the last few years new technology has changed. We used to have to watch and check frequencies but the new radios don't interfere with each other. I got the new Spektrum DX6i that is one of the new 2.4 gig radios and I think it is the best radio I have ever owned. I also think that it is an outstanding deal for a radio with this many features.

The Spektrum radios do not have an assigned frequency but code themselves with the receiver when you turn them on. So far in the group they have operated well even with 50+ flyers in combat at the same time. The Spektrum comes with both large and small recievers that have been some of the most reliable I have used.

Be careful with some of the older radios. I know there are older radios out there you want to dig out and fly with. Many of these older radios get interference form the electric motors. I learned this on the hard way with my "gold sticker certified" Futaba AM Attack 4 radios. If you are trying an older radio cutting the throttle will usually stop the interference problem if it is from the electric motor and speed control. It is advised you stay with FM newer model radios or the new Spektrum line of radios.

Futaba and JR radios are also common. Make sure receivers, servos, batteries are readily available in your local hobby shop for what ever brand you buy. You need to plan so that all of your accessories are compatible with the next radio you want to buy....Continue Reading
Posted by Pierre Audette | Nov 26, 2006 @ 08:21 AM | 8,539 Views
Here's my Stryker built from a spare wing bought at my LHS. The fins were made from 6mm depron, and the canopy is carved pink foam on 3mm depron. The motor is a warp-4 4T on a GWS stick motor mount. It came out to an AUW of 15 oz on 2s1700, light enough for flying in an indoor soccer field.
Posted by bill_higgins | Nov 26, 2006 @ 01:06 AM | 6,248 Views
Well tonight I prepped and assembeled the side panels. I cut all of the 1/4" sticks in half which is why it looks like Im not centered over the plans !! Brian said that his 260 as well as McConville's were done this way, so I dont have any structual fears. (This plane is for precession only anyway !!)

I should start the actual "Frame up" of the fuse tommorrow.

Bill Higgins
Desert Aircraft...Continue Reading