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Search: Posts Made By: Gyrobob
Forum: Power Systems 05-09-2014, 02:31 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
Pic of record setting Bensen B-8M with O&R 1 HP...

Pic of record setting Bensen B-8M with O&R 1 HP prerotater.
Forum: Power Systems 05-09-2014, 12:55 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
175601 The original Bensen B8M gyro...

175601


The original Bensen B8M gyro (there were tens of thousands of these made) was often equipped with an O&R 1 hp gas powered prerotater that could get the rotor up to about 150 RRPM. This...
Forum: Power Systems 05-09-2014, 12:46 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
Your tongue-in-cheek suggestion reminds me of...

Your tongue-in-cheek suggestion reminds me of this procedure. Cute, eh?

https://www.facebook.com/photo.php?v=401176083333530&set=vb.291480754303064&type=2&theater
Forum: Power Systems 05-09-2014, 12:40 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
I was going to bring this one up. I have...

I was going to bring this one up.

I have seen a few of these in operation. It is a really cool idea, but after chatting with the owner/operators, they have two problems with it,... both real, and...
Forum: Power Systems 05-09-2014, 05:40 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
I'm not locked into electric motors with props,.....

I'm not locked into electric motors with props,.. I just want the lightest possible system that can get the rotor prerotated above 100 rpm.

If in this brainstorming session someone comes up with...
Forum: Power Systems 05-09-2014, 05:35 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
You folks have a lot of good ideas for 500 lb...

You folks have a lot of good ideas for 500 lb gyrocopters,.. and there are a lot of them out there. I'm wanting to fly an ultralight gyro. Max weight 254 lbs. Most ultralight gyros have NO...
Forum: Power Systems 05-09-2014, 05:33 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
Yes, it is lovely. And heavy.

Yes, it is lovely. And heavy.
Forum: Power Systems 05-09-2014, 05:32 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
More and more weight. I'm lookin' for less than...

More and more weight. I'm lookin' for less than 10 lbs total.
Forum: Power Systems 05-09-2014, 05:30 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
Now you're talkin' !!! I was going to bring that...

Now you're talkin' !!! I was going to bring that up. Wireless control.
Forum: Power Systems 05-09-2014, 05:29 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
Any system to turn the rotor directly will weigh...

Any system to turn the rotor directly will weigh 10 lbs or more.
Forum: Power Systems 05-09-2014, 05:25 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
I didn't ask if an 8" prop would work. I asked...

I didn't ask if an 8" prop would work. I asked how much thrust it could provide.

With a 20" prop I wouldn't need a rotor,... I'd just strap it to the top of my helmet and take off straight up...
Forum: Power Systems 05-09-2014, 12:18 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
http://www.gate.net/~rich/bensen_days.htm ...

http://www.gate.net/~rich/bensen_days.htm


Here's a visitor's collection of pics on the prerotater shown in the opening post. He says they said it only got up to 150 RRPM. That is just fine...
Forum: Power Systems 05-09-2014, 12:00 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
How much thrust can you get from an 8 inch prop...

How much thrust can you get from an 8 inch prop turning an rpm that represents a reasonable compromise of horsepower and prop efficiency?
Forum: Power Systems 05-08-2014, 11:56 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
"I've seen the little propane ram jets on the...

"I've seen the little propane ram jets on the tips though." The only gyro to do this was the Fairey Rotodyne.

106 db ,......... No airports would allow it to land.

The Hiller Hornet in the...
Forum: Power Systems 05-08-2014, 11:25 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
This weighs about 5 lbs. Two of them would weigh...

This weighs about 5 lbs. Two of them would weigh 10 pounds. Even without all the peripheral stuff and batteries, it is too heavy.

Assuming it were going to be used, how large a prop would it...
Forum: Power Systems 05-08-2014, 11:23 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
This thing probably weighs 25 lbs. What diameter...

This thing probably weighs 25 lbs. What diameter prop would it swing?
Forum: Power Systems 05-08-2014, 11:19 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
A "disc" brake on the main rotor is quite common....

A "disc" brake on the main rotor is quite common. Usually it is nothing more than a pad pushing on the side of the ring gear around the rotor head. It works okay, but it weighs a few lbs.
Forum: Power Systems 05-08-2014, 11:17 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
The few systems using R/C electric motors to...

The few systems using R/C electric motors to drive small props mounted on the main rotor have used both systems,... small batteries mounted close to the center of rotation of the main rotor,.. and...
Forum: Power Systems 05-08-2014, 11:12 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
"you would need to factor in the drag on the...

"you would need to factor in the drag on the rotors caused by the props."

With the props stopped, the drag will be minimal. They will be only three feet or so from the axis of rotation, so the...
Forum: Power Systems 05-08-2014, 07:13 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
Been there done that. I have built a few...

Been there done that.

I have built a few gyros, each of which had a prerotater. All the commercially available systems work fairly well. Some them use hydraulics and can get the rotor up to 250...
Forum: Power Systems 05-08-2014, 03:11 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
Mounting the motor/props at the blade tips will...

Mounting the motor/props at the blade tips will not work. The tips of the rotors in forward flight when the rotor is spinning 385 RRPM is about .7 mach.

I am looking for a set-up as shown in the...
Forum: Power Systems 05-08-2014, 02:18 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
What would be the pros and cons of using electric...

What would be the pros and cons of using electric ducted fans for this purpose?

Would reversing the direction of rotation of the fan to create reverse thrust for main rotor slowdown would be very...
Forum: Power Systems 05-08-2014, 02:17 PM
Replies: 78
Views: 2,267
Posted By Gyrobob
The 15 minutes is not a concrete number. It would...

The 15 minutes is not a concrete number. It would take a couple minutes of full power to get the rotor up to about 100 RRPM, I would guess,.. based on what I have seen older systems like this do. It...
Forum: Power Systems 05-08-2014, 02:54 AM
Replies: 78
Views: 2,267
Posted By Gyrobob
Full size gyrocopter prerotater electric motors

I need a very light prerotater for the rotor on a full-size single-place gyrocopter.

Do current R/C power systems have these capabilities?
-- max weight of 7 pounds (motors, batteries,...
Showing results 1 to 24 of 24

 
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