Spinners Explained?
06-24-2008, 12:40 PM
#26
RE: Spinners Explained?
Jim,
I've always thought the spinner manufacturers should make a design that absorbs energy like the crash bumpers on a car. The inside of the cone would have molded-in seams that would split on impact. The volume of the spinner would be filled with styrofoam or some other lightweight, energy absorbing material. Upon impact the spinner would split open sort of like a a lag bolt used to mount shelves on drywall. It might save a crankshaft.
I've always thought the spinner manufacturers should make a design that absorbs energy like the crash bumpers on a car. The inside of the cone would have molded-in seams that would split on impact. The volume of the spinner would be filled with styrofoam or some other lightweight, energy absorbing material. Upon impact the spinner would split open sort of like a a lag bolt used to mount shelves on drywall. It might save a crankshaft.
06-24-2008, 12:45 PM
#27
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RE: Spinners Explained?
ORIGINAL: CrateCruncher
Jim,
I've always thought the spinner manufacturers should make a design that absorbs energy like the crash bumpers on a car. The inside of the cone would have molded-in seams that would split on impact. The volume of the spinner would be filled with styrofoam or some other lightweight, energy absorbing material. Upon impact the spinner would split open sort of like a a lag bolt used to mount shelves on drywall. It might save a crankshaft.
Jim,
I've always thought the spinner manufacturers should make a design that absorbs energy like the crash bumpers on a car. The inside of the cone would have molded-in seams that would split on impact. The volume of the spinner would be filled with styrofoam or some other lightweight, energy absorbing material. Upon impact the spinner would split open sort of like a a lag bolt used to mount shelves on drywall. It might save a crankshaft.
01-07-2009, 02:37 PM
#29
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RE: Spinners Explained?
There is NO rule that a spinner must be used in casual flying!! However, some sanctioned events require spinners, and some events require specific sized spinners.
check this out http://www.modelaircraft.org/files/706.pdf
check this out http://www.modelaircraft.org/files/706.pdf
01-09-2009, 10:01 AM
#31
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RE: Spinners Explained?
From the AMA competition regulations (current) for Aerobatics:
6.5: All planes must have rounded prop spinners or blunt faced hubs such that no propeller shaft protrudes. Rounded devices shall have a radius of point not less than three (3) millimeters.
I think the requirement is only there for specific competitions, not as a general rule.
6.5: All planes must have rounded prop spinners or blunt faced hubs such that no propeller shaft protrudes. Rounded devices shall have a radius of point not less than three (3) millimeters.
I think the requirement is only there for specific competitions, not as a general rule.
01-09-2009, 05:19 PM
#32
RE: Spinners Explained?
A little history-
Once upon a time , there were speed control line models which used pointed spinners these were typically 2"in dia and 3 to 4 inches long - nasty things ! Some of the FF guys also used em.
If the plane "got loose" - it would poke a good sized hole in just about anything
the AMA advisory was well intended .
At th present time the rule is "interpreted " as req'd.
Once upon a time , there were speed control line models which used pointed spinners these were typically 2"in dia and 3 to 4 inches long - nasty things ! Some of the FF guys also used em.
If the plane "got loose" - it would poke a good sized hole in just about anything
the AMA advisory was well intended .
At th present time the rule is "interpreted " as req'd.
05-04-2021, 07:44 PM
#33
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In full scale flight, spinners are used to aid in smoothing the airflow around the nose of the aircraft (along with making the aircraft more aesthetically pleasing). As you know, many aircraft features that are necessary for full scale aircraft are not for our models - spinners are one such unnecessary feature in our small models (unless you're a pylon racer). Choose one that looks nice and meets up with the curve of the fuselage properly.
What about electric starter, will they still work?
Thanks
05-04-2021, 09:01 PM
#34
To answer your question, Sullivan has a starter insert for bare props:
https://sullivanproducts.com/product/s635/
05-05-2021, 04:31 AM
#35
Yea, from a safety viewpoint a spinner is pretty much useless. However there are practical reasons to use a spinner.
1. A well tuned glow 2 stroke is easier to hand start with a spinner.
2. If using an aluminum spinner the slight flywheel affect will aid in a low/reliable idle.
3. Most of the electric only spinners aid in getting cooling airflow directly to the motor.
1. A well tuned glow 2 stroke is easier to hand start with a spinner.
2. If using an aluminum spinner the slight flywheel affect will aid in a low/reliable idle.
3. Most of the electric only spinners aid in getting cooling airflow directly to the motor.
