Swif-f-ft (oz3910)
About this Plan
Swif-f-ft. Jetex model design at 2 different wingspans. 22.75 in span for Jetex 150 power, and Swif-f-ft 17.5 in span for Jetex 50 power. From MAN, July 1958.
This PDF includes both plans and the full article text.
Quote: "For 10 years, Jetex has been a safe means of flying jet-type models by a true rocket principle. For the 150 engine, a plan-service drawing, opposite; for the 50, a full size drawing, ready for instant use. Swif-f-ft, by Gerald R. Zeigenfuse.
Ever since the AMA and Pan American introduced the new and interesting Rocket Powered event there has been an upsurge of activity in the field of jet-powered models. Because it is a new event, the field is wide open for new and unusual designs. Still, the basic problem is almost the same as it is on a high-powered gassie: namely, the great difference in speed between power on and power off. It was because of this problem that our model follows closely the design trend of the modern gassie and is not just a converted hand-launch glider. The absence of torque makes things a little easier on us because we do not have to worry about flying a particular flight pattern.
The swept-back wing and stabilizer were used merely to give the model eye appeal. Anyway, all the modem jets flying today have swept wings so there is no reason why we shouldn't try to keep pace with our models. Also, the swept wing allows us to use an average nose-moment arm but still gives the appearance that it is radically short.
This particular design lives up to all our expectations, as it handles the powered flight beautifully. The rearward CG and the large stabilizer help here and also give the plane an excellent glide. Using a tilted stab for glide circle also gives us a moderate circle under power that doesn't tighten up with any increase in speed. The plane turns in the same direction in both glide and powered flight and makes the transition from power to glide a joy to behold.
Before starting construction, remember that you pay a stiff penalty in performance if your plane is overweight. Use good judgement in your selection of wood and stick to the lighter grades. The wing and stab are designed to used soft wood or they will be overweight. The tail surfaces should be kept light to prevent a balance problem. A good rule to follow on any model such as this or one of similar configuration is to not let the tail assembly weigh more than 10% of the total weight of the finished airplane..."
Supplementary file notes
Planfile includes article.
Corrections?
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
-
(oz3910)
Swif-f-ft
by Gerald Zeigenfuse
from Model Airplane News
July 1958
23in span
Jetex F/F
clean :)
all formers complete :)
got article :) -
Found online 18/01/2013 at:
http://www.rcgroups.com/forums/showpost.php?p=23846752...
Filesize: 1997KB
Format: • PDFbitmap
Credit*: aeromeddeler
Downloads: 1530
Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk
User comments
No comments yet for this plan. Got something to say about this one?Add a comment
- Swif-f-ft (oz3910)
- Plan File Filesize: 1997KB Filename: Swif-f-ft_oz3910.pdf
- help with downloads
Notes
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
Terms of Use
© Outerzone, 2011-2025.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.