I would like to get some feedback on how 'Dynathrust' props in the 18" range perform. Is their performance similar to props in their price range like Master Airscrew or better / worst. Thanks

I have one and found that it is great for stirring paint.

Ken

i have to agree with Ken,they make great paint stirrers. Around here we call the DynaBUSTS,they break in flight,and down comes ur plane.They aren't worth the paint on them.

Years a go I had a 20" Dynabust, shed a blade in flight, the Extra fuselage was 80% damaged, the engine all most destroyed.

Thank goodness I asked, as I don't think I need that expensive a paint stirrer.

In all fairness...and to lend some balance to this prop bashing thread....I have to say that I regularly use Dynathrust props, in the 18" to 22" range, on all of my giant scale planes. They are strong, and they are cost effective. They may not yield the same high performance figures as the much more costly composite props, but then they don't break the bank either. If you are flying IMAC, pattern, 3D, or another venue requiring the very highest performance that modern technology has to offer....spend the dough to get what you think you need. However, in the real world of sport flying, or warbirds, where maximum performance is not a primary requirement...the Dynathrust props are tough, reliable, they perform well, and they are easily within the price range of most modelers. Additionally, I prefer them to the much more delicate wood props which are priced similarly.
In terms of reliability in normal service...I have never had a Dynathrust prop fail...and I have never seen one fail...and I see huge numbers of them at the many Big-Bird and warbird events that I frequent every year. I would suspect that props that come apart in flight, do so as a result of some unfortunate previous, abusive incident....such as tree and shrubbery landings...lawn-dart landings, nose-overs into the dirt, improperly reamed/drilled prop shaft holes, spinners cutting into the prop, etc etc. And if you do manage to break one....yes, the remaining pieces do make a damm fine paint stirrer. Manufacturers these days are quite sensitive to liability issues, and so they go to great lengths to assure that their product...especially a propellor...stays together! I hope you find this information helpful, and a bit reassuring.
Happy landings.
Jim

Capt Jim,

Thanks for your input on the topic and your indepth appreciation of the product's performance as experienced by you.

However since there seems to be reasonable evidence of them being unsafe, just for my own piece of mind and for the safety of myself, others and my model, I think I will pass on using them.

They break, and when they break in flight, they will shake your plane to pieces in just a few short seconds !

I have used them on research planes for years without problems. Maybe not the most efficient prop but when you fly off undeveloped runways, they have been a good value for the price.

Elson

I had 6 of these in 14 inch size, so out of balance that I threw them away instead of trying to balance them.

I have been flying the dnya's for several years on a ST3000 and 2 ST4500's with no problems. 20x8, 20x10, 22x10 sizes.
prop rpms 7200 up to 8800.

I have rock pits from the gravel on the runway in them over time but they have been good for me and priced reasonable.

They break when I dumb thumb it and strike the bottom edge of air.

my 2 cents

Tony

I have serveral dynathrusts 22-10's I will give you. I used ONE dynathrust on a G-38 for YEARS, flew the helll out of it, hit it on the rocks, hit it on the pavement, took a BIG nick out of the leading edge, filed it down the nick and flew it a bunch more [X(] BUT I have heard enough people say they break in flight that I am afraid to use them now, especially on my G-62's.. Im smart enough to know that just because mine didnt break does not mean that there is no problem.... If you do use dynathrust, they will arrive to you so out of blanace that you better get your hacksaw out [:@] I had to trim at least 1/2 inch off mine to balance them correctly... They are very inefficient, but I was trying to save some money, but I just ended up throwing my money away... Send me a stamp for postage and I will send you 3 22 inch dynathrust props to stir paint with, ruin your airplane with, or impale your best buddy with on runup .

"I used ONE dynathrust on a G-38 for YEARS, flew the helll out of it, hit it on the rocks, hit it on the pavement, took a BIG nick out of the leading edge, filed it down the nick and flew it a bunch more"

sounds like the prop prooved itself pretty well.... kinda like the 10-6 Master Airscrew paint stirrer on virtually every trainer out there....

[:-]

I do believe that some of the folks that have used these props have had good experiences with them as stated.

However, in light of their history of reported failures and poor quality control, I would rather learn from the bad experiences of others wherever possible, than from my own.

I had one throw a blade and the instant out of balance condition riped the motor out of the plane. Once the motor was found (G38) it was trash; bent crank. Oh by the way, my Byron Cap21 was damaged to the point that it was put in the circular file and burned at the field. This was at least 10 years ago but I have not used a Dynathrust since and never will.